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https://github.com/Tyrrrz/MiniRazor
Portable Razor compiler & code generator
https://github.com/Tyrrrz/MiniRazor
compilation csharp-sourcegenerator hacktoberfest razor razor-templates roslyn template-engine templates
Last synced: about 2 months ago
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Portable Razor compiler & code generator
- Host: GitHub
- URL: https://github.com/Tyrrrz/MiniRazor
- Owner: Tyrrrz
- License: mit
- Archived: true
- Created: 2020-07-29T13:25:47.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2023-07-16T23:01:10.000Z (about 1 year ago)
- Last Synced: 2024-05-22T04:33:47.978Z (4 months ago)
- Topics: compilation, csharp-sourcegenerator, hacktoberfest, razor, razor-templates, roslyn, template-engine, templates
- Language: C#
- Homepage:
- Size: 164 KB
- Stars: 220
- Watchers: 8
- Forks: 24
- Open Issues: 0
-
Metadata Files:
- Readme: Readme.md
- Changelog: Changelog.md
- License: License.txt
Awesome Lists containing this project
- csharp-source-generators - MiniRazor -   Portable Razor compiler & code generator. (Source Generators / Webprogramming)
README
# MiniRazor
[](https://github.com/Tyrrrz/.github/blob/master/docs/project-status.md)
[](https://vshymanskyy.github.io/StandWithUkraine)
[](https://github.com/Tyrrrz/MiniRazor/actions)
[](https://codecov.io/gh/Tyrrrz/MiniRazor)
[](https://nuget.org/packages/MiniRazor)
[](https://nuget.org/packages/MiniRazor.Runtime)
[](https://discord.gg/2SUWKFnHSm)
[](https://twitter.com/tyrrrz/status/1495972128977571848)
Development of this project is entirely funded by the community. Consider donating to support!
> **Note**:
> As an alternative, consider using [RazorBlade](https://github.com/ltrzesniewski/RazorBlade) for build-time template compilation and [RazorLight](https://github.com/toddams/RazorLight) for run-time template compilation.
**MiniRazor** is a tiny abstraction over the Razor engine, designed to provide a simple interface to compile and render templates, both during build and at run-time.
## Terms of use[[?]](https://github.com/Tyrrrz/.github/blob/master/docs/why-so-political.md)
By using this project or its source code, for any purpose and in any shape or form, you grant your **implicit agreement** to all the following statements:
- You **condemn Russia and its military aggression against Ukraine**
- You **recognize that Russia is an occupant that unlawfully invaded a sovereign state**
- You **support Ukraine's territorial integrity, including its claims over temporarily occupied territories of Crimea and Donbas**
- You **reject false narratives perpetuated by Russian state propaganda**
To learn more about the war and how you can help, [click here](https://tyrrrz.me). Glory to Ukraine! 🇺🇦
## Install
All-in-one meta package:
- 📦 [NuGet](https://nuget.org/packages/MiniRazor): `dotnet add package MiniRazor`
Specialized packages:
- 📦 [NuGet](https://nuget.org/packages/MiniRazor.Compiler): `dotnet add package MiniRazor.Compiler` (**run-time compilation** only)
- 📦 [NuGet](https://nuget.org/packages/MiniRazor.CodeGen): `dotnet add package MiniRazor.CodeGen` (**build-time compilation** only)
> ⚠ If you're referencing **MiniRazor.CodeGen**, ensure that it's **NOT** marked as a development dependency!
> Although the source generator assembly itself is only used during build, this package also contains binaries which are required by the generated code at run-time.
## Usage
### Compiling templates at build-time
> **Warning**:
> Compiling at build time requires [MiniRazor](#install) or [MiniRazor.CodeGen](#install).
**MiniRazor** comes with a source generator that can parse Razor templates and transpile them into C# classes directly at build time.
This workflow is suitable and highly recommended for scenarios where your templates are not expected to change.
To do that, first create a Razor template as shown here:
```razor
@inherits MiniRazor.TemplateBase
@namespace MyNamespace.Templates
Hello @Model
Hello @Model
```
Note the usage of two important directives at the top of the file:
- `@inherits` directive indicates that the base type of this template is `MiniRazor.TemplateBase`, with the model of type `string`.
If this directive is not included, the template will inherit from `MiniRazor.TemplateBase` instead — providing no type-safety when working with the model.
- `@namespace` directive instructs the compiler to put the generated template class into the `MyNamespace.Templates` namespace.
If this directive is not included, the default namespace of `MiniRazor.GeneratedTemplates` will be used instead.
In order to make the template accessible by **MiniRazor**'s source generator, you need to add it to the project using the `AdditionalFiles` element and mark it with the `IsRazorTemplate="true"` attribute:
```xml
Exe
net6.0
```
After that, you should be able to run `dotnet build` to trigger the source generator and generate the corresponding template classes.
The template from the above example will then become available as the `MyNamespace.Templates.TemplateFoo` class.
To render it, you can call its `RenderAsync(...)` static method:
```csharp
// Reference the namespace where the template is located
using MyNamespace.Templates;
// Render the template to a string, with @Model set to "world"
var output = await TemplateFoo.RenderAsync("world");
// Or, alternatively, render it to the specified TextWriter
await TemplateFoo.RenderAsync(Console.Out, "world");
```
Note that the type of the `model` parameter in `RenderAsync(...)` is automatically inferred based on the `@inherits` directive specified in the template.
Here, since the template is derived from `MiniRazor.TemplateBase`, the method expects a parameter of type `string`.
### Compiling templates at run-time
> **Warning**:
> Compiling at run-time requires [MiniRazor](#install) or [MiniRazor.Compiler](#install).
If the previous approach doesn't fit your usage scenario, you can also compile templates at run-time.
To do that, call `Razor.Compile(...)` with the template's source code:
```csharp
using MiniRazor;
// Compile the template into an in-memory assembly
var template = Razor.Compile("
Hello, @Model.Subject!
");
// Render the template to a string
var output = await template.RenderAsync(new MyModel { Subject = "World" });
//
Hello, World!
```
Calling `Razor.Compile(...)` transforms the provided Razor template directly into IL code hosted in a dynamic in-memory assembly.
This returns an instance of `TemplateDescriptor`, which you can then use to render output.
By default, **MiniRazor** uses the default assembly load context, which means that the compiled IL code will stay in memory forever.
To avoid that, you can pass a custom instance of `AssemblyLoadContext` that lets you control the lifetime of the generated assemblies:
```csharp
// Create an isolated assembly load context
var alc = new AssemblyLoadContext("MyALC", true);
// Compile the template
var template = Razor.Compile("
Hello, @Model.Subject!
", alc);
// Unload the ALC once it's no longer needed
alc.Unload();
```
### Templating features
#### HTML encoding
Output rendered with Razor templates is HTML-encoded by default.
If you want to print raw HTML content, for example if it's sourced from somewhere else, you can use the `Raw(...)` method:
```razor
@{
string GetHtml() => "
Hello world!
";
}
@GetHtml() // <p>Hello world!</p>
@Raw(GetHtml()) //
Hello world!
```