https://github.com/simoncropp/polyfill
Source only package that exposes newer APIs, .net features, and C# features to older runtimes.
https://github.com/simoncropp/polyfill
Last synced: 23 days ago
JSON representation
Source only package that exposes newer APIs, .net features, and C# features to older runtimes.
- Host: GitHub
- URL: https://github.com/simoncropp/polyfill
- Owner: SimonCropp
- License: mit
- Created: 2023-03-02T22:42:46.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2026-06-01T01:38:28.000Z (24 days ago)
- Last Synced: 2026-06-01T02:08:23.412Z (24 days ago)
- Language: C#
- Homepage:
- Size: 4.08 MB
- Stars: 466
- Watchers: 3
- Forks: 42
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
- Contributing: contributing.md
- Funding: .github/FUNDING.yml
- License: license.txt
- Code of conduct: code_of_conduct.md
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README
# 
Polyfill
[](https://ci.appveyor.com/project/SimonCropp/Polyfill)
[](https://www.nuget.org/packages/Polyfill/)
Source only package that exposes newer .NET and C# features to older runtimes.
The package targets `netstandard2.0` and is designed to support the following runtimes.
* `net461`, `net462`, `net47`, `net471`, `net472`, `net48`, `net481`
* `netcoreapp2.0`, `netcoreapp2.1`, `netcoreapp3.0`, `netcoreapp3.1`
* `net5.0`, `net6.0`, `net7.0`, `net8.0`, `net9.0`, `net10.0`, `net11.0`
* `uap10`
**API count: 959**
### Per Target Framework
| Target | APIs |
| -- | -- |
| `net461` | 934 |
| `net462` | 934 |
| `net47` | 933 |
| `net471` | 932 |
| `net472` | 928 |
| `net48` | 928 |
| `net481` | 928 |
| `netstandard2.0` | 930 |
| `netstandard2.1` | 761 |
| `netcoreapp2.0` | 854 |
| `netcoreapp2.1` | 773 |
| `netcoreapp2.2` | 773 |
| `netcoreapp3.0` | 719 |
| `netcoreapp3.1` | 718 |
| `net5.0` | 590 |
| `net6.0` | 495 |
| `net7.0` | 342 |
| `net8.0` | 223 |
| `net9.0` | 147 |
| `net10.0` | 95 |
| `net11.0` | 58 |
| `uap10.0` | 920 |
**See [Milestones](../../milestones?state=closed) for release notes.**
### Powered by
[](https://jb.gg/OpenSourceSupport)
## Nuget
* https://nuget.org/packages/Polyfill/
* https://nuget.org/packages/PolyfillLib/ (See [PolyfillLib docs](polyfill-lib.md))
## TargetFrameworks
It is recommended that projects that consume Polyfill multi-target all TFMs that the project is expected to be consumed in. See [Polyfill and TargetFrameworks](target-frameworks.md)
## SDK / LangVersion
This project uses features from the current stable SDK and C# language. As such consuming projects should target those:
### LangVersion
```xml
latest
```
### global.json
```json
{
"sdk": {
"version": "10.0.100",
"rollForward": "latestFeature"
}
}
```
## Assembly size impact
### Assembly Sizes
| | Empty Assembly | With Polyfill | Diff | Ensure | ArgumentExceptions | StringInterpolation | Nullability |
|----------------|----------------|---------------|-----------|-----------|--------------------|---------------------|-------------|
| netstandard2.0 | 8.0KB | 326.5KB | +318.5KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| netstandard2.1 | 8.5KB | 280.0KB | +271.5KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net461 | 8.5KB | 325.5KB | +317.0KB | +8.5KB | +6.5KB | +9.0KB | +14.0KB |
| net462 | 7.0KB | 329.0KB | +322.0KB | +8.5KB | +6.5KB | +9.0KB | +14.0KB |
| net47 | 7.0KB | 328.5KB | +321.5KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net471 | 8.5KB | 328.0KB | +319.5KB | +8.5KB | +6.5KB | +9.0KB | +13.5KB |
| net472 | 8.5KB | 326.5KB | +318.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net48 | 8.5KB | 326.5KB | +318.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net481 | 8.5KB | 326.5KB | +318.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| netcoreapp2.0 | 9.0KB | 303.0KB | +294.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| netcoreapp2.1 | 9.0KB | 282.5KB | +273.5KB | +9.0KB | +7.0KB | +9.0KB | +14.0KB |
| netcoreapp2.2 | 9.0KB | 282.5KB | +273.5KB | +9.0KB | +7.0KB | +9.0KB | +14.0KB |
| netcoreapp3.0 | 9.5KB | 274.0KB | +264.5KB | +9.0KB | +6.5KB | +9.5KB | +14.0KB |
| netcoreapp3.1 | 9.5KB | 272.5KB | +263.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
| net5.0 | 9.5KB | 236.0KB | +226.5KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net6.0 | 10.0KB | 177.0KB | +167.0KB | +10.0KB | +7.0KB | +512bytes | +4.0KB |
| net7.0 | 10.0KB | 139.5KB | +129.5KB | +9.0KB | +5.5KB | +512bytes | +3.5KB |
| net8.0 | 9.5KB | 111.0KB | +101.5KB | +8.0KB | | +512bytes | +3.0KB |
| net9.0 | 9.5KB | 67.0KB | +57.5KB | +9.0KB | | +512bytes | +3.5KB |
| net10.0 | 10.0KB | 43.5KB | +33.5KB | +9.0KB | | +512bytes | +3.5KB |
| net11.0 | 10.0KB | 20.5KB | +10.5KB | +9.0KB | | +512bytes | +3.5KB |
### Assembly Sizes with EmbedUntrackedSources
| | Empty Assembly | With Polyfill | Diff | Ensure | ArgumentExceptions | StringInterpolation | Nullability |
|----------------|----------------|---------------|-----------|-----------|--------------------|---------------------|-------------|
| netstandard2.0 | 8.0KB | 474.9KB | +466.9KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| netstandard2.1 | 8.5KB | 403.2KB | +394.7KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net461 | 8.5KB | 474.9KB | +466.4KB | +16.2KB | +8.2KB | +13.9KB | +19.4KB |
| net462 | 7.0KB | 478.4KB | +471.4KB | +16.2KB | +8.2KB | +13.9KB | +19.4KB |
| net47 | 7.0KB | 477.7KB | +470.7KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net471 | 8.5KB | 476.8KB | +468.3KB | +16.2KB | +8.2KB | +13.9KB | +18.9KB |
| net472 | 8.5KB | 474.3KB | +465.8KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net48 | 8.5KB | 474.3KB | +465.8KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net481 | 8.5KB | 474.3KB | +465.8KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| netcoreapp2.0 | 9.0KB | 441.6KB | +432.6KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| netcoreapp2.1 | 9.0KB | 409.9KB | +400.9KB | +16.7KB | +8.7KB | +13.9KB | +19.4KB |
| netcoreapp2.2 | 9.0KB | 409.9KB | +400.9KB | +16.7KB | +8.7KB | +13.9KB | +19.4KB |
| netcoreapp3.0 | 9.5KB | 392.1KB | +382.6KB | +16.7KB | +8.2KB | +14.4KB | +19.4KB |
| netcoreapp3.1 | 9.5KB | 390.6KB | +381.1KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
| net5.0 | 9.5KB | 335.9KB | +326.4KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net6.0 | 10.0KB | 256.9KB | +246.9KB | +17.7KB | +8.7KB | +1.1KB | +4.7KB |
| net7.0 | 10.0KB | 200.8KB | +190.8KB | +16.6KB | +6.9KB | +1.1KB | +4.2KB |
| net8.0 | 9.5KB | 157.1KB | +147.6KB | +15.5KB | +299bytes | +1.1KB | +3.7KB |
| net9.0 | 9.5KB | 92.7KB | +83.2KB | +16.5KB | | +1.1KB | +4.2KB |
| net10.0 | 10.0KB | 60.7KB | +50.7KB | +16.5KB | | +1.1KB | +4.2KB |
| net11.0 | 10.0KB | 30.3KB | +20.3KB | +16.5KB | | +1.1KB | +4.2KB |
## PolyfillLib
To consume Polyfill as a library (instead of a source-only package) see [PolyfillLib](polyfill-lib.md)
## Troubleshooting
Make sure `DefineConstants` is not set from dotnet CLI, which would override important constants set by Polyfill.
Instead of using `dotnet publish -p:DefineConstants=MY_CONSTANT`, set the constant indirectly in the project:
```xml
$(DefineConstants);MY_CONSTANT
```
and use `dotnet publish -p:MyConstant=true`.
## Included polyfills
### ModuleInitializerAttribute
* [ModuleInitializerAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.moduleinitializerattribute)
Reference: [Module Initializers](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-9.0/module-initializers)
[Test]
public async Task ModuleInitTest() =>
await Assert.That(InitCalled).IsTrue();
[ModuleInitializer]
public static void ModuleInit() =>
InitCalled = true;
```
snippet source | anchor
### IsExternalInit
Reference: [init (C# Reference)](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/init)
```cs
class InitSample
{
public int Member { get; init; }
}
```
snippet source | anchor
### Nullable attributes
* [AllowNullAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.allownullattribute)
* [DisallowNullAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.disallownullattribute)
* [DoesNotReturnAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.doesnotreturnattribute)
* [DoesNotReturnIfAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.doesnotreturnifattribute)
* [MaybeNullAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.maybenullattribute)
* [MaybeNullWhenAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.maybenullwhenattribute)
* [MemberNotNullAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.membernotnullattribute)
* [MemberNotNullWhenAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.membernotnullwhenattribute)
* [NotNullAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.notnullattribute)
* [NotNullIfNotNullAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.notnullifnotnullattribute)
* [NotNullWhenAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.notnullwhenattribute)
Reference: [Nullable reference types](https://learn.microsoft.com/en-us/dotnet/csharp/nullable-references)
### Required attributes
* [RequiredMemberAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.requiredmemberattribute)
* [SetsRequiredMembersAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.setsrequiredmembersattribute)
Reference: [C# required modifier](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/required)
```cs
public class Person
{
public Person()
{
}
[SetsRequiredMembers]
public Person(string name) =>
Name = name;
public required string Name { get; init; }
}
```
snippet source | anchor
### CompilerFeatureRequiredAttribute
* [CompilerFeatureRequiredAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.compilerfeaturerequiredattribute)
> Indicates that compiler support for a particular feature is required for the location where this attribute is applied.
### CollectionBuilderAttribute
* [CollectionBuilderAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.collectionbuilderattribute)
> Can be used to make types compatible with collection expressions
### ConstantExpectedAttribute
* [ConstantExpectedAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.constantexpectedattribute)
> Indicates that the specified method parameter expects a constant.
### SkipLocalsInit
* [SkipLocalsInitAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.skiplocalsinitattribute)
Reference: [SkipLocalsInitAttribute](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/attributes/general#skiplocalsinit-attribute)
> the SkipLocalsInit attribute prevents the compiler from setting the .locals init flag when emitting to metadata. The SkipLocalsInit attribute is a single-use attribute and can be applied to a method, a property, a class, a struct, an interface, or a module, but not to an assembly. SkipLocalsInit is an alias for SkipLocalsInitAttribute.
```cs
class SkipLocalsInitSample
{
[SkipLocalsInit]
static void ReadUninitializedMemory()
{
Span numbers = stackalloc int[120];
for (var i = 0; i < 120; i++)
{
Console.WriteLine(numbers[i]);
}
}
}
```
snippet source | anchor
### Index and Range
Reference: [Indices and ranges](https://learn.microsoft.com/en-us/dotnet/csharp/tutorials/ranges-indexes)
If consuming in a project that targets net461 or net462, a reference to System.ValueTuple is required. See [References: System.ValueTuple](#systemvaluetuple).
```cs
class IndexRangeSample
{
[Test]
public async Task Range()
{
var substring = "value"[2..];
await Assert.That(substring).IsEqualTo("lue");
}
[Test]
public async Task Index()
{
var ch = "value"[^2];
await Assert.That(ch).IsEqualTo('u');
}
[Test]
public async Task ArrayIndex()
{
var array = new[]
{
"value1",
"value2"
};
var value = array[^2];
await Assert.That(value).IsEqualTo("value1");
}
}
```
snippet source | anchor
### OverloadResolutionPriority
* [Release Notes](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview7/csharp.md#prioritize-better-overloads-with-overloadresolutionpriority-attribute)
> C# introduces a new attribute, System.Runtime.CompilerServices.OverloadResolutionPriority, that can be used by API authors to adjust the relative priority of overloads within a single type as a means of steering API consumers to use specific APIs, even if those APIs would normally be considered ambiguous or otherwise not be chosen by C#'s overload resolution rules. This helps framework and library authors guide API usage as they APIs as they develop new and better patterns.
>
> The OverloadResolutionPriorityAttribute can be used in conjunction with the ObsoleteAttribute. A library author may mark properties, methods, types and other programming elements as obsolete, while leaving them in place for backwards compatibility. Using programming elements marked with the ObsoleteAttribute will result in compiler warnings or errors. However, the type or member is still visible to overload resolution and may be selected over a better overload or cause an ambiguity failure. The OverloadResolutionPriorityAttribute lets library authors fix these problems by lowering the priority of obsolete members when there are better alternatives.
* [API on learn](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.overloadresolutionpriorityattribute.-ctor)
* [API Proposal](https://github.com/dotnet/runtime/issues/102173)
#### Usage
```cs
public class OverloadResolutionPriorityAttributeTests
{
[Test]
public Task Run()
{
int[] arr = [1, 2, 3];
//Prints "Span" because resolution priority is higher
Method(arr);
return Task.CompletedTask;
}
[OverloadResolutionPriority(2)]
static void Method(ReadOnlySpan list) =>
Console.WriteLine("Span");
[OverloadResolutionPriority(1)]
static void Method(int[] list) =>
Console.WriteLine("Array");
}
```
snippet source | anchor
### UnscopedRefAttribute
* [UnscopedRefAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.unscopedrefattribute)
Reference: [Low Level Struct Improvements](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-11.0/low-level-struct-improvements.md)
```cs
struct UnscopedRefUsage
{
int field1;
[UnscopedRef] ref int Prop1 => ref field1;
}
```
snippet source | anchor
### RequiresPreviewFeaturesAttribute
* [RequiresPreviewFeatures](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.requirespreviewfeaturesattribute)
* [Design](https://github.com/dotnet/designs/blob/main/accepted/2021/preview-features/preview-features.md)
* [API Proposal](https://github.com/dapr/dotnet-sdk/issues/1219)
### CallerArgumentExpressionAttribute
* [CallerArgumentExpressionAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.callerargumentexpressionattribute)
Reference: [CallerArgumentExpression](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-10.0/caller-argument-expression)
```cs
static class FileUtil
{
public static void FileExists(string path, [CallerArgumentExpression("path")] string name = "")
{
if (!File.Exists(path))
{
throw new ArgumentException($"File not found. Path: {path}", name);
}
}
}
static class FileUtilUsage
{
public static string[] Method(string path)
{
FileUtil.FileExists(path);
return File.ReadAllLines(path);
}
}
```
snippet source | anchor
### InterpolatedStringHandler
Enable by adding an MSBuild property `PolyStringInterpolation`
```
...
true
```
* [AppendInterpolatedStringHandler](https://learn.microsoft.com/en-us/dotnet/api/system.text.stringbuilder.appendinterpolatedstringhandler)
* [DefaultInterpolatedStringHandler](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.defaultinterpolatedstringhandler)
* [InterpolatedStringHandlerAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.interpolatedstringhandlerattribute)
* [InterpolatedStringHandlerArgumentAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.interpolatedstringhandlerargumentattribute)
* [ISpanFormattable](https://learn.microsoft.com/en-us/dotnet/api/system.ispanformattable)
References: [String Interpolation in C# 10 and .NET 6](https://devblogs.microsoft.com/dotnet/string-interpolation-in-c-10-and-net-6/), [Write a custom string interpolation handler](https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/interpolated-string-handler)
> [!IMPORTANT]
> In the below extension method list, the methods using `AppendInterpolatedStringHandler` parameter are not extensions because the compiler prefers to use the overload with `string` parameter instead.
### StringSyntaxAttribute
* [StringSyntaxAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.stringsyntaxattribute)
Reference: [.NET 7 - The StringSyntaxAttribute](https://bartwullems.blogspot.com/2022/12/net-7-stringsyntaxattribute.html)
### Trimming annotation attributes
* [DynamicallyAccessedMembersAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.dynamicallyaccessedmembersattribute)
* [DynamicDependencyAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.dynamicdependencyattribute)
* [RequiresUnreferencedCodeAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.requiresunreferencedcodeattribute)
* [RequiresDynamicCodeAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.requiresdynamiccodeattribute)
* [UnconditionalSuppressMessageAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.unconditionalsuppressmessageattribute)
Reference: [Prepare .NET libraries for trimming](https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming/prepare-libraries-for-trimming)
### Platform compatibility
* [ObsoletedOSPlatformAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.obsoletedosplatformattribute)
* [SupportedOSPlatformAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.supportedosplatformattribute)
* [SupportedOSPlatformGuardAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.supportedosplatformguardattribute)
* [TargetPlatformAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.targetplatformattribute)
* [UnsupportedOSPlatformAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.unsupportedosplatformattribute)
* [UnsupportedOSPlatformGuardAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.versioning.unsupportedosplatformguardattribute)
Reference: [Platform compatibility analyzer](https://learn.microsoft.com/en-us/dotnet/standard/analyzers/platform-compat-analyzer)
### StackTraceHiddenAttribute
* [StackTraceHiddenAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.stacktracehiddenattribute)
Reference: [C# – Hide a method from the stack trace](https://makolyte.com/csharp-exclude-exception-throw-helper-methods-from-the-stack-trace/)
### UnmanagedCallersOnly
* [UnmanagedCallersOnlyAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.unmanagedcallersonlyattribute)
Reference: [Improvements in native code interop in .NET 5.0](https://devblogs.microsoft.com/dotnet/improvements-in-native-code-interop-in-net-5-0/)
### SuppressGCTransition
* [SuppressGCTransitionAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.suppressgctransitionattribute)
### DisableRuntimeMarshalling
* [DisableRuntimeMarshallingAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.disableruntimemarshallingattribute)
## Extensions
The class `Polyfill` includes the following extension methods:
### Extension methods
#### ArgumentException
> Requires [`true`](#argumentexception-1) in the consuming project.
* `void ThrowIfNullOrEmpty(string?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentexception.throwifnullorempty?view=net-11.0#system-argumentexception-throwifnullorempty(system-string-system-string))
* `void ThrowIfNullOrWhiteSpace(string?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentexception.throwifnullorwhitespace?view=net-11.0#system-argumentexception-throwifnullorwhitespace(system-string-system-string))
#### ArgumentNullException
> Requires [`true`](#argumentexception-1) in the consuming project.
* `void ThrowIfNull(object?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentnullexception.throwifnull?view=net-11.0#system-argumentnullexception-throwifnull(system-object-system-string))
* `void ThrowIfNull(void*)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentnullexception.throwifnull?view=net-11.0#system-argumentnullexception-throwifnull(system-void*-system-string))
#### ArgumentOutOfRangeException
> Requires [`true`](#argumentexception-1) in the consuming project.
* `void ThrowIfEqual(T, T) where T : IEquatable?` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifequal?view=net-11.0#system-argumentoutofrangeexception-throwifequal-1(-0-0-system-string))
* `void ThrowIfGreaterThan(nint, nint)`
* `void ThrowIfGreaterThan(T, T) where T : IComparable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifgreaterthan?view=net-11.0#system-argumentoutofrangeexception-throwifgreaterthan-1(-0-0-system-string))
* `void ThrowIfGreaterThanOrEqual(nint, nint)`
* `void ThrowIfGreaterThanOrEqual(T, T) where T : IComparable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifgreaterthanorequal?view=net-11.0#system-argumentoutofrangeexception-throwifgreaterthanorequal-1(-0-0-system-string))
* `void ThrowIfLessThan(nint, nint)`
* `void ThrowIfLessThan(T, T) where T : IComparable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwiflessthan?view=net-11.0#system-argumentoutofrangeexception-throwiflessthan-1(-0-0-system-string))
* `void ThrowIfLessThanOrEqual(nint, nint)`
* `void ThrowIfLessThanOrEqual(T, T) where T : IComparable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwiflessthanorequal?view=net-11.0#system-argumentoutofrangeexception-throwiflessthanorequal-1(-0-0-system-string))
* `void ThrowIfNegative(nint)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifnegative?view=net-11.0#system-argumentoutofrangeexception-throwifnegative-1(-0-system-string))
* `void ThrowIfNegative(T) where T : struct, IComparable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifnegative?view=net-11.0#system-argumentoutofrangeexception-throwifnegative-1(-0-system-string))
* `void ThrowIfNegativeOrZero(nint)`
* `void ThrowIfNegativeOrZero(T) where T : struct, IComparable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifnegativeorzero?view=net-11.0#system-argumentoutofrangeexception-throwifnegativeorzero-1(-0-system-string))
* `void ThrowIfNotEqual(T, T) where T : IEquatable?` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifnotequal?view=net-11.0#system-argumentoutofrangeexception-throwifnotequal-1(-0-0-system-string))
* `void ThrowIfZero(nint)`
* `void ThrowIfZero(T) where T : struct, IEquatable` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifzero?view=net-11.0#system-argumentoutofrangeexception-throwifzero-1(-0-system-string))
#### ArraySegment
* `void CopyTo(ArraySegment)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.arraysegment-1.copyto?view=net-11.0#system-arraysegment-1-copyto(-0()))
* `void CopyTo(T[], int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.arraysegment-1.copyto?view=net-11.0#system-arraysegment-1-copyto(-0()-system-int32))
* `void CopyTo(T[])` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.arraysegment-1.copyto?view=net-11.0#system-arraysegment-1-copyto(-0()))
* `ArraySegmentEnumerator GetEnumerator()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.arraysegment-1.getenumerator?view=net-11.0)
#### BinaryPrimitives
* `double ReadDoubleBigEndian(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.readdoublebigendian?view=net-11.0)
* `double ReadDoubleLittleEndian(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.readdoublelittleendian?view=net-11.0)
* `float ReadSingleBigEndian(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.readsinglebigendian?view=net-11.0)
* `float ReadSingleLittleEndian(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.readsinglelittleendian?view=net-11.0)
* `bool TryReadDoubleBigEndian(ReadOnlySpan, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.tryreaddoublebigendian?view=net-11.0)
* `bool TryReadDoubleLittleEndian(ReadOnlySpan, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.tryreaddoublelittleendian?view=net-11.0)
* `bool TryReadSingleBigEndian(ReadOnlySpan, float)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.tryreadsinglebigendian?view=net-11.0)
* `bool TryReadSingleLittleEndian(ReadOnlySpan, float)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.tryreadsinglelittleendian?view=net-11.0)
* `bool TryWriteDoubleBigEndian(Span, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.trywritedoublebigendian?view=net-11.0)
* `bool TryWriteDoubleLittleEndian(Span, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.trywritedoublelittleendian?view=net-11.0)
* `bool TryWriteSingleBigEndian(Span, float)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.trywritesinglebigendian?view=net-11.0)
* `bool TryWriteSingleLittleEndian(Span, float)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.trywritesinglelittleendian?view=net-11.0)
* `void WriteDoubleBigEndian(Span, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.writedoublebigendian?view=net-11.0)
* `void WriteDoubleLittleEndian(Span, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.writedoublelittleendian?view=net-11.0)
* `void WriteSingleBigEndian(Span, float)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.writesinglebigendian?view=net-11.0)
* `void WriteSingleLittleEndian(Span, float)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives.writesinglelittleendian?view=net-11.0)
#### Boolean
* `bool TryFormat(Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.boolean.tryformat?view=net-11.0)
#### Byte
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryformat?view=net-11.0#system-byte-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryformat?view=net-11.0#system-byte-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryParse(ReadOnlySpan, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-readonlyspan((system-char))-system-globalization-numberstyles-system-iformatprovider-system-byte@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-readonlyspan((system-byte))-system-iformatprovider-system-byte@))
* `bool TryParse(ReadOnlySpan, NumberStyles, IFormatProvider?, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-readonlyspan((system-byte))-system-globalization-numberstyles-system-iformatprovider-system-byte@))
* `bool TryParse(ReadOnlySpan, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-readonlyspan((system-char))-system-byte@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-byte@))
* `bool TryParse(ReadOnlySpan, NumberStyles, IFormatProvider?, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-readonlyspan((system-char))-system-globalization-numberstyles-system-iformatprovider-system-byte@))
* `bool TryParse(string?, IFormatProvider?, byte)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.byte.tryparse?view=net-11.0#system-byte-tryparse(system-string-system-iformatprovider-system-byte@))
#### CancellationToken
* `CancellationTokenRegistration Register(Action, object?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken.register?view=net-11.0#system-threading-cancellationtoken-register(system-action((system-object-system-threading-cancellationtoken))-system-object))
* `CancellationTokenRegistration UnsafeRegister(Action, object?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken.unsaferegister?view=net-11.0#system-threading-cancellationtoken-unsaferegister(system-action((system-object-system-threading-cancellationtoken))-system-object))
* `CancellationTokenRegistration UnsafeRegister(Action, object?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken.unsaferegister?view=net-11.0#system-threading-cancellationtoken-unsaferegister(system-action((system-object))-system-object))
#### CancellationTokenSource
* `Task CancelAsync()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.threading.cancellationtokensource.cancelasync?view=net-11.0)
#### Capture
* `ValueSpan` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.capture.valuespan?view=net-11.0)
#### Char
* `bool Equals(char, StringComparison)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.equals?view=net-11.0#system-char-equals(system-char-system-stringcomparison))
* `bool IsAscii(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isascii?view=net-11.0)
* `bool IsAsciiDigit(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciidigit?view=net-11.0)
* `bool IsAsciiHexDigit(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciihexdigit?view=net-11.0)
* `bool IsAsciiHexDigitLower(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciihexdigitlower?view=net-11.0)
* `bool IsAsciiHexDigitUpper(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciihexdigitupper?view=net-11.0)
* `bool IsAsciiLetter(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciiletter?view=net-11.0)
* `bool IsAsciiLetterLower(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciiletterlower?view=net-11.0)
* `bool IsAsciiLetterOrDigit(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciiletterordigit?view=net-11.0)
* `bool IsAsciiLetterUpper(char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isasciiletterupper?view=net-11.0)
* `bool IsBetween(char, char, char)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.char.isbetween?view=net-11.0)
#### ConcurrentBag
* `void Clear()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.concurrent.concurrentbag-1.clear?view=net-11.0)
#### ConcurrentDictionary
* `TValue GetOrAdd(TKey, Func, TArg) where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.concurrent.concurrentdictionary-2.getoradd?view=net-11.0#system-collections-concurrent-concurrentdictionary-2-getoradd-1(-0-system-func((-0-0-1))-0))
#### ConcurrentQueue
* `void Clear()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.concurrent.concurrentqueue-1.clear?view=net-11.0)
#### Console
* `SafeFileHandle OpenStandardErrorHandle()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.console.openstandarderrorhandle?view=net-11.0)
* `SafeFileHandle OpenStandardInputHandle()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.console.openstandardinputhandle?view=net-11.0)
* `SafeFileHandle OpenStandardOutputHandle()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.console.openstandardoutputhandle?view=net-11.0)
#### Convert
* `OperationStatus FromHexString(ReadOnlySpan, Span, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.fromhexstring?view=net-11.0#system-convert-fromhexstring(system-readonlyspan((system-byte))-system-span((system-byte))-system-int32@-system-int32@))
* `byte[] FromHexString(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.fromhexstring?view=net-11.0#system-convert-fromhexstring(system-readonlyspan((system-byte))))
* `OperationStatus FromHexString(ReadOnlySpan, Span, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.fromhexstring?view=net-11.0#system-convert-fromhexstring(system-readonlyspan((system-char))-system-span((system-byte))-system-int32@-system-int32@))
* `byte[] FromHexString(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.fromhexstring?view=net-11.0#system-convert-fromhexstring(system-readonlyspan((system-char))))
* `OperationStatus FromHexString(string, Span, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.fromhexstring?view=net-11.0#system-convert-fromhexstring(system-string-system-span((system-byte))-system-int32@-system-int32@))
* `byte[] FromHexString(string)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.fromhexstring?view=net-11.0#system-convert-fromhexstring(system-string))
* `string ToHexString(byte[], int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tohexstring?view=net-11.0#system-convert-tohexstring(system-byte()-system-int32-system-int32))
* `string ToHexString(byte[])` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tohexstring?view=net-11.0#system-convert-tohexstring(system-byte()))
* `string ToHexString(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tohexstring?view=net-11.0#system-convert-tohexstring(system-readonlyspan((system-byte))))
* `string ToHexStringLower(byte[], int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tohexstringlower?view=net-11.0#system-convert-tohexstringlower(system-byte()-system-int32-system-int32))
* `string ToHexStringLower(byte[])` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tohexstringlower?view=net-11.0#system-convert-tohexstringlower(system-byte()))
* `string ToHexStringLower(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tohexstringlower?view=net-11.0#system-convert-tohexstringlower(system-readonlyspan((system-byte))))
* `bool TryFromBase64Chars(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tryfrombase64chars?view=net-11.0)
* `bool TryFromBase64String(string, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.tryfrombase64string?view=net-11.0)
* `bool TryToBase64Chars(ReadOnlySpan, Span, int, Base64FormattingOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.trytobase64chars?view=net-11.0)
* `bool TryToHexString(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.trytohexstring?view=net-11.0#system-convert-trytohexstring(system-readonlyspan((system-byte))-system-span((system-byte))-system-int32@))
* `bool TryToHexString(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.trytohexstring?view=net-11.0#system-convert-trytohexstring(system-readonlyspan((system-byte))-system-span((system-char))-system-int32@))
* `bool TryToHexStringLower(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.trytohexstringlower?view=net-11.0#system-convert-trytohexstringlower(system-readonlyspan((system-byte))-system-span((system-byte))-system-int32@))
* `bool TryToHexStringLower(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.convert.trytohexstringlower?view=net-11.0#system-convert-trytohexstringlower(system-readonlyspan((system-byte))-system-span((system-char))-system-int32@))
#### DateOnly
* `void Deconstruct(int, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.deconstruct?view=net-11.0)
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.tryformat?view=net-11.0#system-dateonly-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.tryformat?view=net-11.0#system-dateonly-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
#### DateTime
* `DateTime AddMicroseconds(double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.addmicroseconds?view=net-11.0)
* `void Deconstruct(DateOnly, TimeOnly)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.deconstruct?view=net-11.0#system-datetime-deconstruct(system-dateonly@-system-timeonly@))
* `void Deconstruct(int, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.deconstruct?view=net-11.0#system-datetime-deconstruct(system-int32@-system-int32@-system-int32@))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryformat?view=net-11.0#system-datetime-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryformat?view=net-11.0#system-datetime-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryParse(ReadOnlySpan, DateTime)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparse?view=net-11.0#system-datetime-tryparse(system-readonlyspan((system-char))-system-datetime@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, DateTime)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparse?view=net-11.0#system-datetime-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-datetime@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, DateTimeStyles, DateTime)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparse?view=net-11.0#system-datetime-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-globalization-datetimestyles-system-datetime@))
* `bool TryParse(string?, IFormatProvider?, DateTime)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparse?view=net-11.0#system-datetime-tryparse(system-string-system-iformatprovider-system-datetime@))
* `bool TryParseExact(ReadOnlySpan, ReadOnlySpan, IFormatProvider?, DateTimeStyles, DateTime)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparseexact?view=net-11.0#system-datetime-tryparseexact(system-readonlyspan((system-char))-system-readonlyspan((system-char))-system-iformatprovider-system-globalization-datetimestyles-system-datetime@))
* `bool TryParseExact(ReadOnlySpan, string, IFormatProvider?, DateTimeStyles, DateTime)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparseexact?view=net-11.0#system-datetime-tryparseexact(system-readonlyspan((system-char))-system-readonlyspan((system-char))-system-iformatprovider-system-globalization-datetimestyles-system-datetime@))
* `Microsecond` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.microsecond?view=net-11.0)
* `Nanosecond` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetime.nanosecond?view=net-11.0)
#### DateTimeOffset
* `DateTimeOffset AddMicroseconds(double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.addmicroseconds?view=net-11.0)
* `void Deconstruct(DateOnly, TimeOnly, TimeSpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.deconstruct?view=net-11.0)
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryformat?view=net-11.0#system-datetimeoffset-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryformat?view=net-11.0#system-datetimeoffset-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryParse(ReadOnlySpan, DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryparse?view=net-11.0#system-datetimeoffset-tryparse(system-readonlyspan((system-char))-system-datetimeoffset@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryparse?view=net-11.0#system-datetimeoffset-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-datetimeoffset@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, DateTimeStyles, DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryparse?view=net-11.0#system-datetimeoffset-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-globalization-datetimestyles-system-datetimeoffset@))
* `bool TryParse(string?, IFormatProvider?, DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryparse?view=net-11.0#system-datetimeoffset-tryparse(system-string-system-iformatprovider-system-datetimeoffset@))
* `bool TryParseExact(ReadOnlySpan, ReadOnlySpan, IFormatProvider?, DateTimeStyles, DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryparseexact?view=net-11.0#system-datetimeoffset-tryparseexact(system-readonlyspan((system-char))-system-readonlyspan((system-char))-system-iformatprovider-system-globalization-datetimestyles-system-datetimeoffset@))
* `bool TryParseExact(ReadOnlySpan, string, IFormatProvider?, DateTimeStyles, DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tryparseexact?view=net-11.0#system-datetimeoffset-tryparseexact(system-readonlyspan((system-char))-system-readonlyspan((system-char))-system-iformatprovider-system-globalization-datetimestyles-system-datetimeoffset@))
* `Microsecond` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.microsecond?view=net-11.0)
* `Nanosecond` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.nanosecond?view=net-11.0)
#### Decimal
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryformat?view=net-11.0#system-decimal-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryformat?view=net-11.0#system-decimal-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryParse(ReadOnlySpan, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-readonlyspan((system-byte))-system-decimal@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-readonlyspan((system-byte))-system-iformatprovider-system-decimal@))
* `bool TryParse(ReadOnlySpan, NumberStyles, IFormatProvider?, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-readonlyspan((system-byte))-system-globalization-numberstyles-system-iformatprovider-system-decimal@))
* `bool TryParse(ReadOnlySpan, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-readonlyspan((system-char))-system-decimal@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-decimal@))
* `bool TryParse(ReadOnlySpan, NumberStyles, IFormatProvider?, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-readonlyspan((system-char))-system-globalization-numberstyles-system-iformatprovider-system-decimal@))
* `bool TryParse(string?, IFormatProvider?, decimal)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=net-11.0#system-decimal-tryparse(system-string-system-iformatprovider-system-decimal@))
#### DefaultInterpolatedStringHandler
* `void Clear()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.defaultinterpolatedstringhandler.clear?view=net-11.0)
#### Delegate
* `InvocationListEnumerator EnumerateInvocationList(TDelegate?) where TDelegate : Delegate` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.delegate.enumerateinvocationlist?view=net-11.0)
* `HasSingleTarget` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.delegate.hassingletarget?view=net-11.0)
#### Dictionary
* `void EnsureCapacity(int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.ensurecapacity?view=net-11.0)
* Note: No-op on older targets; the BCL grows the backing storage.
* `DictionaryAlternateLookup GetAlternateLookup() where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.getalternatelookup?view=net-11.0)
* Note: Lookups are O(n) on older targets; the BCL is O(1).
* Note: Returns the free-standing `DictionaryAlternateLookup` rather than the BCL's nested `Dictionary.AlternateLookup`. Use `var` for cross-target code.
* `void TrimExcess(int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.trimexcess?view=net-11.0#system-collections-generic-dictionary-2-trimexcess(system-int32))
* Note: No-op on older targets; the BCL shrinks the backing storage.
* `void TrimExcess()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.trimexcess?view=net-11.0#system-collections-generic-dictionary-2-trimexcess)
* Note: No-op on older targets; the BCL shrinks the backing storage.
* `bool TryGetAlternateLookup(DictionaryAlternateLookup) where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.trygetalternatelookup?view=net-11.0)
* Note: Lookups are O(n) on older targets; the BCL is O(1).
#### DictionaryEntry
* `void Deconstruct(object, object?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.dictionaryentry.deconstruct?view=net-11.0#system-collections-dictionaryentry-deconstruct(system-object@-system-object@))
#### Directory
* `DirectoryInfo CreateTempSubdirectory(string?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.createtempsubdirectory?view=net-11.0)
* `IEnumerable EnumerateDirectories(string, string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.enumeratedirectories?view=net-11.0#system-io-directory-enumeratedirectories(system-string-system-string-system-io-enumerationoptions))
* `IEnumerable EnumerateFiles(string, string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.enumeratefiles?view=net-11.0#system-io-directory-enumeratefiles(system-string-system-string-system-io-enumerationoptions))
* `IEnumerable EnumerateFileSystemEntries(string, string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.enumeratefilesystementries?view=net-11.0#system-io-directory-enumeratefilesystementries(system-string-system-string-system-io-enumerationoptions))
* `string[] GetDirectories(string, string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.getdirectories?view=net-11.0#system-io-directory-getdirectories(system-string-system-string-system-io-enumerationoptions))
* `string[] GetFiles(string, string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.getfiles?view=net-11.0#system-io-directory-getfiles(system-string-system-string-system-io-enumerationoptions))
* `string[] GetFileSystemEntries(string, string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directory.getfilesystementries?view=net-11.0#system-io-directory-getfilesystementries(system-string-system-string-system-io-enumerationoptions))
#### DirectoryInfo
* `IEnumerable EnumerateDirectories(string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directoryinfo.enumeratedirectories?view=net-11.0#system-io-directoryinfo-enumeratedirectories(system-string-system-io-enumerationoptions))
* `IEnumerable EnumerateFiles(string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directoryinfo.enumeratefiles?view=net-11.0#system-io-directoryinfo-enumeratefiles(system-string-system-io-enumerationoptions))
* `IEnumerable EnumerateFileSystemInfos(string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directoryinfo.enumeratefilesysteminfos?view=net-11.0#system-io-directoryinfo-enumeratefilesysteminfos(system-string-system-io-enumerationoptions))
* `DirectoryInfo[] GetDirectories(string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directoryinfo.getdirectories?view=net-11.0#system-io-directoryinfo-getdirectories(system-string-system-io-enumerationoptions))
* `FileInfo[] GetFiles(string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directoryinfo.getfiles?view=net-11.0#system-io-directoryinfo-getfiles(system-string-system-io-enumerationoptions))
* `FileSystemInfo[] GetFileSystemInfos(string, EnumerationOptions)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.directoryinfo.getfilesysteminfos?view=net-11.0#system-io-directoryinfo-getfilesysteminfos(system-string-system-io-enumerationoptions))
#### Double
* `ulong DoubleToUInt64Bits(double)`
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryformat?view=net-11.0#system-double-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryFormat(Span, int, ReadOnlySpan, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryformat?view=net-11.0#system-double-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
* `bool TryParse(ReadOnlySpan, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-readonlyspan((system-byte))-system-double@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-readonlyspan((system-byte))-system-iformatprovider-system-double@))
* `bool TryParse(ReadOnlySpan, NumberStyles, IFormatProvider?, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-readonlyspan((system-byte))-system-globalization-numberstyles-system-iformatprovider-system-double@))
* `bool TryParse(ReadOnlySpan, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-readonlyspan((system-char))-system-double@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-double@))
* `bool TryParse(ReadOnlySpan, NumberStyles, IFormatProvider?, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-readonlyspan((system-char))-system-globalization-numberstyles-system-iformatprovider-system-double@))
* `bool TryParse(string?, IFormatProvider?, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-string-system-iformatprovider-system-double@))
#### Encoding
* `int GetByteCount(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.getbytecount?view=net-11.0#system-text-encoding-getbytecount(system-readonlyspan((system-char))))
* `int GetBytes(ReadOnlySpan, Span)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.getbytes?view=net-11.0#system-text-encoding-getbytes(system-readonlyspan((system-char))-system-span((system-byte))))
* `int GetCharCount(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.getcharcount?view=net-11.0#system-text-encoding-getcharcount(system-readonlyspan((system-byte))))
* `int GetChars(ReadOnlySpan, Span)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.getchars?view=net-11.0#system-text-encoding-getchars(system-readonlyspan((system-byte))-system-span((system-char))))
* `string GetString(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.getstring?view=net-11.0#system-text-encoding-getstring(system-readonlyspan((system-byte))))
* `bool TryGetBytes(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.trygetbytes?view=net-11.0)
* `bool TryGetChars(ReadOnlySpan, Span, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.trygetchars?view=net-11.0)
* `Latin1` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.latin1?view=net-11.0)
#### Enum
* `string[] GetNames() where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.getnames?view=net-11.0)
* `TEnum[] GetValues() where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.getvalues?view=net-11.0)
* `Array GetValuesAsUnderlyingType(Type)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.getvaluesasunderlyingtype?view=net-11.0#system-enum-getvaluesasunderlyingtype(system-type))
* `Array GetValuesAsUnderlyingType() where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.getvaluesasunderlyingtype?view=net-11.0#system-enum-getvaluesasunderlyingtype-1)
* `bool IsDefined(TEnum) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.isdefined?view=net-11.0#system-enum-isdefined-1(-0))
* `TEnum Parse(ReadOnlySpan, bool) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.parse?view=net-11.0#system-enum-parse-1(system-readonlyspan((system-char))-system-boolean))
* `TEnum Parse(ReadOnlySpan) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.parse?view=net-11.0#system-enum-parse-1(system-readonlyspan((system-char))))
* `TEnum Parse(string, bool) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.parse?view=net-11.0#system-enum-parse-1(system-string-system-boolean))
* `TEnum Parse(string) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.parse?view=net-11.0#system-enum-parse-1(system-string-system-boolean))
* `bool TryFormat(TEnum, Span, int, ReadOnlySpan) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.tryformat?view=net-11.0)
* `bool TryParse(ReadOnlySpan, bool, TEnum) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.tryparse?view=net-11.0#system-enum-tryparse-1(system-readonlyspan((system-char))-system-boolean-0@))
* `bool TryParse(ReadOnlySpan, TEnum) where TEnum : struct, Enum` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.enum.tryparse?view=net-11.0#system-enum-tryparse-1(system-readonlyspan((system-char))-0@))
#### Enumerable
* `IEnumerable InfiniteSequence(T, T) where T : IAdditionOperators` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.infinitesequence?view=net-11.0)
* `IEnumerable Sequence(T, T, T) where T : INumber` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.sequence?view=net-11.0)
#### Environment
* `ProcessId` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.environment.processid?view=net-11.0#system-environment-processid)
* `ProcessPath` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.environment.processpath?view=net-11.0#system-environment-processpath)
#### EqualityComparer
* `EqualityComparer Create(Func, Func?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.equalitycomparer-1.create?view=net-11.0)
#### EventInfo
* `NullabilityState GetNullability()`
* `NullabilityInfo GetNullabilityInfo()`
* `bool IsNullable()`
#### ExceptionDispatchInfo
* `Exception SetCurrentStackTrace(Exception)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.exceptionservices.exceptiondispatchinfo.setcurrentstacktrace?view=net-11.0)
#### FieldInfo
* `NullabilityState GetNullability()`
* `NullabilityInfo GetNullabilityInfo()`
* `bool IsNullable()`
#### File
* `void AppendAllBytes(string, byte[])` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendallbytes?view=net-11.0#system-io-file-appendallbytes(system-string-system-byte()))
* `void AppendAllBytes(string, ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendallbytes?view=net-11.0#system-io-file-appendallbytes(system-string-system-readonlyspan((system-byte))))
* `Task AppendAllBytesAsync(string, byte[], CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendallbytesasync?view=net-11.0#system-io-file-appendallbytesasync(system-string-system-byte()-system-threading-cancellationtoken))
* `Task AppendAllBytesAsync(string, ReadOnlyMemory, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendallbytesasync?view=net-11.0#system-io-file-appendallbytesasync(system-string-system-readonlymemory((system-byte))-system-threading-cancellationtoken))
* `Task AppendAllLinesAsync(string, IEnumerable, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalllinesasync?view=net-11.0#system-io-file-appendalllinesasync(system-string-system-collections-generic-ienumerable((system-string))-system-threading-cancellationtoken))
* `Task AppendAllLinesAsync(string, IEnumerable, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalllinesasync?view=net-11.0#system-io-file-appendalllinesasync(system-string-system-collections-generic-ienumerable((system-string))-system-text-encoding-system-threading-cancellationtoken))
* `void AppendAllText(string, ReadOnlySpan, Encoding)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalltext?view=net-11.0#system-io-file-appendalltext(system-string-system-readonlyspan((system-char))-system-text-encoding))
* `void AppendAllText(string, ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalltext?view=net-11.0#system-io-file-appendalltext(system-string-system-readonlyspan((system-char))))
* `Task AppendAllTextAsync(string, ReadOnlyMemory, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalltextasync?view=net-11.0#system-io-file-appendalltextasync(system-string-system-readonlymemory((system-char))-system-threading-cancellationtoken))
* `Task AppendAllTextAsync(string, ReadOnlyMemory, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalltextasync?view=net-11.0#system-io-file-appendalltextasync(system-string-system-readonlymemory((system-char))-system-text-encoding-system-threading-cancellationtoken))
* `Task AppendAllTextAsync(string, string?, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalltextasync?view=net-11.0#system-io-file-appendalltextasync(system-string-system-string-system-threading-cancellationtoken))
* `Task AppendAllTextAsync(string, string?, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendalltextasync?view=net-11.0#system-io-file-appendalltextasync(system-string-system-string-system-text-encoding-system-threading-cancellationtoken))
* `FileSystemInfo CreateHardLink(string, string)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.createhardlink?view=net-11.0)
* `void Move(string, string, bool)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.move?view=net-11.0#system-io-file-move(system-string-system-string-system-boolean))
* `SafeFileHandle OpenNullHandle()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.opennullhandle?view=net-11.0)
* `Task ReadAllBytesAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readallbytesasync?view=net-11.0)
* `Task ReadAllLinesAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readalllinesasync?view=net-11.0#system-io-file-readalllinesasync(system-string-system-threading-cancellationtoken))
* `Task ReadAllLinesAsync(string, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readalllinesasync?view=net-11.0#system-io-file-readalllinesasync(system-string-system-text-encoding-system-threading-cancellationtoken))
* `Task ReadAllTextAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readalltextasync?view=net-11.0#system-io-file-readalltextasync(system-string-system-threading-cancellationtoken))
* `Task ReadAllTextAsync(string, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readalltextasync?view=net-11.0#system-io-file-readalltextasync(system-string-system-text-encoding-system-threading-cancellationtoken))
* `IAsyncEnumerable ReadLinesAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readlinesasync?view=net-11.0#system-io-file-readalllinesasync(system-string-system-threading-cancellationtoken))
* `IAsyncEnumerable ReadLinesAsync(string, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.readlinesasync?view=net-11.0#system-io-file-readalllinesasync(system-string-system-text-encoding-system-threading-cancellationtoken))
* `Task WriteAllBytesAsync(string, byte[], CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writeallbytesasync?view=net-11.0#system-io-file-writeallbytesasync(system-string-system-byte()-system-threading-cancellationtoken))
* `Task WriteAllBytesAsync(string, ReadOnlyMemory, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendallbytesasync?view=net-11.0#system-io-file-appendallbytesasync(system-string-system-readonlymemory((system-byte))-system-threading-cancellationtoken))
* `Task WriteAllLinesAsync(string, IEnumerable, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealllinesasync?view=net-11.0#system-io-file-writealllinesasync(system-string-system-collections-generic-ienumerable((system-string))-system-threading-cancellationtoken))
* `Task WriteAllLinesAsync(string, IEnumerable, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealllinesasync?view=net-11.0#system-io-file-writealllinesasync(system-string-system-collections-generic-ienumerable((system-string))-system-text-encoding-system-threading-cancellationtoken))
* `void WriteAllText(string, ReadOnlySpan, Encoding)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltext?view=net-11.0#system-io-file-writealltext(system-string-system-readonlyspan((system-char))-system-text-encoding))
* `void WriteAllText(string, ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltext?view=net-11.0#system-io-file-writealltext(system-string-system-readonlyspan((system-char))))
* `Task WriteAllTextAsync(string, string?, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltextasync?view=net-11.0#system-io-file-writealltextasync(system-string-system-string-system-text-encoding-system-threading-cancellationtoken))
* `Task WriteAllTextAsync(string, string?, Encoding, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltextasync?view=net-11.0#system-io-file-writealltextasync(system-string-system-string-system-text-encoding-system-threading-cancellationtoken))
#### FileInfo
* `void CreateAsHardLink(string)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.fileinfo.createashardlink?view=net-11.0)
#### FileUnixMode
* `UnixFileMode GetUnixFileMode(string)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.getunixfilemode?view=net-11.0#system-io-file-getunixfilemode(system-string))
* `void SetUnixFileMode(string, UnixFileMode)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.io.file.setunixfilemode?view=net-11.0#system-io-file-setunixfilemode(system-string-system-io-unixfilemode))
#### GC
* `T[] AllocateUninitializedArray(int, bool)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.gc.allocateuninitializedarray?view=net-11.0)
#### Guid
* `bool TryFormat(Span, int, ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryformat?view=net-11.0#system-guid-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))))
* `bool TryFormat(Span, int, ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryformat?view=net-11.0#system-guid-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))))
* `Guid CreateVersion7()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.createversion7?view=net-11.0#system-guid-createversion7)
* `Guid CreateVersion7(DateTimeOffset)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.createversion7?view=net-11.0#system-guid-createversion7(system-datetimeoffset))
* `Guid Parse(ReadOnlySpan)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.parse?view=net-11.0#system-guid-parse(system-readonlyspan((system-byte))))
* `bool TryParse(ReadOnlySpan, Guid)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryparse?view=net-11.0#system-guid-tryparse(system-readonlyspan((system-byte))-system-guid@))
* `bool TryParse(ReadOnlySpan, Guid)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryparse?view=net-11.0#system-guid-tryparse(system-readonlyspan((system-char))-system-guid@))
* `bool TryParse(ReadOnlySpan, IFormatProvider?, Guid)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryparse?view=net-11.0#system-guid-tryparse(system-readonlyspan((system-char))-system-iformatprovider-system-guid@))
* `bool TryParse(string?, IFormatProvider?, Guid)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryparse?view=net-11.0#system-guid-tryparse(system-string-system-iformatprovider-system-guid@))
* `bool TryParseExact(ReadOnlySpan, ReadOnlySpan, Guid)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tryparseexact?view=net-11.0#system-guid-tryparseexact(system-readonlyspan((system-char))-system-readonlyspan((system-char))-system-guid@))
* `AllBitsSet` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.guid.allbitsset?view=net-11.0)
#### HashSet
* `void EnsureCapacity(int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.ensurecapacity?view=net-11.0#system-collections-generic-hashset-1-ensurecapacity(system-int32))
* Note: No-op on older targets; the BCL grows the backing storage.
* `HashSetAlternateLookup GetAlternateLookup()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.getalternatelookup?view=net-11.0)
* Note: Lookups are O(n) on older targets; the BCL is O(1).
* Note: Returns the free-standing `HashSetAlternateLookup` rather than the BCL's nested `HashSet.AlternateLookup`. Use `var` for cross-target code.
* `void TrimExcess(int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.trimexcess?view=net-11.0#system-collections-generic-hashset-1-trimexcess(system-int32))
* Note: No-op on older targets; the BCL shrinks the backing storage.
* `bool TryGetAlternateLookup(HashSetAlternateLookup)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.trygetalternatelookup?view=net-11.0)
* Note: Lookups are O(n) on older targets; the BCL is O(1).
* `bool TryGetValue(T, T)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.trygetvalue?view=net-11.0)
#### HttpClient
* `Task GetByteArrayAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.getbytearrayasync?view=net-11.0#system-net-http-httpclient-getbytearrayasync(system-string-system-threading-cancellationtoken))
* `Task GetByteArrayAsync(Uri, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.getbytearrayasync?view=net-11.0#system-net-http-httpclient-getbytearrayasync(system-uri-system-threading-cancellationtoken))
* `Task GetStreamAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.getstreamasync?view=net-11.0#system-net-http-httpclient-getstreamasync(system-string-system-threading-cancellationtoken))
* `Task GetStreamAsync(Uri, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.getstreamasync?view=net-11.0#system-net-http-httpclient-getstreamasync(system-uri-system-threading-cancellationtoken))
* `Task GetStringAsync(string, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.getstringasync?view=net-11.0#system-net-http-httpclient-getstringasync(system-string-system-threading-cancellationtoken))
* `Task GetStringAsync(Uri, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.getstringasync?view=net-11.0#system-net-http-httpclient-getstringasync(system-uri-system-threading-cancellationtoken))
* `Task PatchAsync(string?, HttpContent?, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.patchasync?view=net-11.0#system-net-http-httpclient-patchasync(system-string-system-net-http-httpcontent-system-threading-cancellationtoken))
* `Task PatchAsync(string?, HttpContent?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.patchasync?view=net-11.0#system-net-http-httpclient-patchasync(system-string-system-net-http-httpcontent))
* `Task PatchAsync(Uri?, HttpContent?, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.patchasync?view=net-11.0#system-net-http-httpclient-patchasync(system-uri-system-net-http-httpcontent-system-threading-cancellationtoken))
* `Task PatchAsync(Uri?, HttpContent?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.patchasync?view=net-11.0#system-net-http-httpclient-patchasync(system-uri-system-net-http-httpcontent))
* `HttpResponseMessage Send(HttpRequestMessage, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.send?view=net-11.0#system-net-http-httpclient-send(system-net-http-httprequestmessage-system-threading-cancellationtoken))
* `HttpResponseMessage Send(HttpRequestMessage, HttpCompletionOption, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.send?view=net-11.0#system-net-http-httpclient-send(system-net-http-httprequestmessage-system-net-http-httpcompletionoption-system-threading-cancellationtoken))
* `HttpResponseMessage Send(HttpRequestMessage, HttpCompletionOption)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.send?view=net-11.0#system-net-http-httpclient-send(system-net-http-httprequestmessage-system-net-http-httpcompletionoption))
* `HttpResponseMessage Send(HttpRequestMessage)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.send?view=net-11.0#system-net-http-httpclient-send(system-net-http-httprequestmessage))
#### HttpContent
* `void CopyTo(Stream, System.Net.TransportContext?, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.copyto?view=net-11.0)
* `Task CopyToAsync(Stream, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.copytoasync?view=net-11.0#system-net-http-httpcontent-copytoasync(system-io-stream-system-threading-cancellationtoken))
* `Task CopyToAsync(Stream, System.Net.TransportContext?, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.copytoasync?view=net-11.0#system-net-http-httpcontent-copytoasync(system-io-stream-system-net-transportcontext-system-threading-cancellationtoken))
* `Task LoadIntoBufferAsync(CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.loadintobufferasync?view=net-11.0#system-net-http-httpcontent-loadintobufferasync(system-threading-cancellationtoken))
* `Task LoadIntoBufferAsync(long, CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.loadintobufferasync?view=net-11.0#system-net-http-httpcontent-loadintobufferasync(system-int64-system-threading-cancellationtoken))
* `Task ReadAsByteArrayAsync(CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.readasbytearrayasync?view=net-11.0#system-net-http-httpcontent-readasbytearrayasync(system-threading-cancellationtoken))
* `Stream ReadAsStream(CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.readasstream?view=net-11.0#system-net-http-httpcontent-readasstream(system-threading-cancellationtoken))
* `Task ReadAsStreamAsync(CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.readasstreamasync?view=net-11.0#system-net-http-httpcontent-readasstreamasync(system-threading-cancellationtoken))
* `Task ReadAsStringAsync(CancellationToken)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent.readasstringasync?view=net-11.0#system-net-http-httpcontent-readasstringasync(system-threading-cancellationtoken))
#### IDictionary
* `ReadOnlyDictionary AsReadOnly() where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.collectionextensions.asreadonly?view=net-11.0#system-collections-generic-collectionextensions-asreadonly-2(system-collections-generic-idictionary((-0-1))))
* `bool Remove(TKey, TValue) where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.collectionextensions.remove?view=net-11.0)
* `bool TryAdd(TKey, TValue) where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.collectionextensions.tryadd?view=net-11.0)
#### IEnumerable>
* `Dictionary ToDictionary(IEqualityComparer?) where TKey : notnull` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.todictionary?view=net-11.0#system-linq-enumerable-todictionary-2(system-collections-generic-ienumerable(system-collections-generic-keyvaluepair(-0-1))-system-collections-generic-iequalitycomparer(-0)))
#### IEnumerable
* `IOrderedEnumerable