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https://github.com/thomasclaudiushuber/mvvmgen
MvvmGen is a lightweight MVVM library for XAML applications. It generates your ViewModels on-the-fly for you via a Roslyn-based C# Source Generator.
https://github.com/thomasclaudiushuber/mvvmgen
avaloniaui c-sharp csharp dotnet dotnet-standard maui mvvm source-generator uno uno-platform winui wpf xamarin-forms xaml
Last synced: about 2 months ago
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MvvmGen is a lightweight MVVM library for XAML applications. It generates your ViewModels on-the-fly for you via a Roslyn-based C# Source Generator.
- Host: GitHub
- URL: https://github.com/thomasclaudiushuber/mvvmgen
- Owner: thomasclaudiushuber
- License: mit
- Created: 2021-04-26T13:17:22.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2023-12-12T18:53:55.000Z (9 months ago)
- Last Synced: 2024-05-12T13:31:04.730Z (4 months ago)
- Topics: avaloniaui, c-sharp, csharp, dotnet, dotnet-standard, maui, mvvm, source-generator, uno, uno-platform, winui, wpf, xamarin-forms, xaml
- Language: C#
- Homepage:
- Size: 746 KB
- Stars: 245
- Watchers: 14
- Forks: 21
- Open Issues: 8
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
- RSCG_Examples - MvvmGen
- csharp-source-generators - MvvmGen -   A lightweight MVVM library for XAML applications that generates your ViewModels with a C# Source Generator. (Source Generators / XAML / WPF / Avalonia)
README
# ⚡ MvvmGen
[](https://github.com/thomasclaudiushuber/mvvmgen/actions/workflows/build_mvvmgen.yml)
[](https://www.nuget.org/packages/Mvvmgen)
[](https://www.nuget.org/packages/Mvvmgen.PureCodeGeneration)
## Your Friend Who Writes the Boilerplate for You
Hey there, welcome to the **MvvmGen** repository. **MvvmGen** is a lightweight
and modern MVVM library (.NET Standard 2.0) built with C# Source Generators
that helps you to apply the popular Model-View-ViewModel-pattern (MVVM)
in your XAML applications that you build with WPF, WinUI, Uno Platform,
Avalonia, Xamarin Forms, or .NET MAUI.
MvvmGen is licensed under the [MIT license](LICENSE).
## Get Started
- [Documentation](docs/00_start_here.md)
- [Samples](https://github.com/thomasclaudiushuber/mvvmgen-samples)
- [Blog post that introduces MvvmGen](https://www.thomasclaudiushuber.com/2021/05/12/introducing-the-mvvmgen-library)
- [Blog post about pure code generation](https://www.thomasclaudiushuber.com/2021/05/19/mvvmgen-the-special-edition-pure-code-generation)
## Quick intro
In this quick intro, you'll learn that creating a ViewModel is a lot of fun with **MvvmGen**! 🔥
### Installing the MvvmGen NuGet Package
Reference the NuGet package [MvvmGen](https://www.nuget.org/packages/MvvmGen/)
in your .NET application, and then you're ready to go:
```
Install-Package MvvmGen
```
MvvmGen will register itself as a C# source generator in your project,
and it will be your friend who writes the boilerplate for you.
### Generating a ViewModel class
To generate a ViewModel class, you create a new class, you mark it as `partial`,
and you put MvvmGen's `ViewModel` attribute on the class:
```csharp
using MvvmGen;
namespace MyWpfApp.ViewModel
{
[ViewModel]
public partial class EmployeeViewModel
{
}
}
```
The `ViewModel` attribute tells MvvmGen to generate another
partial `EmployeeViewModel` class. Right now, it will be a class
that looks like this:
```csharp
using MvvmGen.Commands;
using MvvmGen.Events;
using MvvmGen.ViewModels;
namespace MyWpfApp.ViewModel
{
partial class EmployeeViewModel : ViewModelBase
{
public EmployeeViewModel()
{
this.OnInitialize();
}
partial void OnInitialize();
}
}
```
You can see that generated class in Visual Studio under Dependencies->Analyzers:
Beside the `ViewModel` attribute, you find many other attributes in the `MvvmGen` namespace
that you can use to decorate your ViewModel class. These attributes allow you to
build a full ViewModel like this:
```csharp
using MvvmGen;
using MvvmGen.Events;
namespace MyWpfApp.ViewModel
{
public record EmployeeSavedEvent(string FirstName, string LastName);
[Inject(typeof(IEventAggregator))]
[ViewModel]
public partial class EmployeeViewModel
{
[Property] private string _firstName;
[Property] private string _lastName;
[Command(CanExecuteMethod = nameof(CanSave))]
private void Save()
{
EventAggregator.Publish(new EmployeeSavedEvent(FirstName, LastName));
}
[CommandInvalidate(nameof(FirstName))]
private bool CanSave()
{
return !string.IsNullOrEmpty(FirstName);
}
}
}
```
For this ViewModel, MvvmGen will generate the following partial class definition for you
```csharp
using MvvmGen.Commands;
using MvvmGen.Events;
using MvvmGen.ViewModels;
namespace MyWpfApp.ViewModel
{
partial class EmployeeViewModel : ViewModelBase
{
private IDelegateCommand? _saveCommand;
public EmployeeViewModel(MvvmGen.Events.IEventAggregator eventAggregator)
{
this.EventAggregator = eventAggregator;
this.OnInitialize();
}
partial void OnInitialize();
public IDelegateCommand SaveCommand => _saveCommand ??= new DelegateCommand(_ => Save(), _ => CanSave());
public string FirstName
{
get => _firstName;
set
{
if (_firstName != value)
{
_firstName = value;
OnPropertyChanged("FirstName");
}
}
}
public string LastName
{
get => _lastName;
set
{
if (_lastName != value)
{
_lastName = value;
OnPropertyChanged("LastName");
}
}
}
protected MvvmGen.Events.IEventAggregator EventAggregator { get; private set; }
protected override void InvalidateCommands(string? propertyName)
{
base.InvalidateCommands(propertyName);
if(propertyName == "FirstName")
{
SaveCommand.RaiseCanExecuteChanged();
}
}
}
}
```
To learn all the details, go to the [documentation in this repo](docs/00_start_here.md).