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mvvmgen by Thomas Claudius Huber

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Name: mvvmgen

MvvmGen is a next generation MVVM library for XAML applications built with C# source generators. MvvmGen helps you to efficently build your WPF, WinUI, and MAUI apps with the Model-View-ViewModel pattern, as it generates all the boilerplate for you.

Author: Thomas Claudius Huber

NuGet: https://www.nuget.org/packages/mvvmgen/

You can find more details at https://github.com/thomasclaudiushuber/mvvmgen

Source: https://github.com/thomasclaudiushuber/mvvmgen

Author​

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Thomas Claudius Huber Alt text

Original Readme​

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⚡ MvvmGen

Build MvvmGen NuGet MvvmGen NuGet MvvmGen

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.

Get Started​

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 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:

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:

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: Generated class

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:

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

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.

About​

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Generate MVVM boilerplate code

How to use​

Example (source csproj, source files)​

This is the CSharp Project that references mvvmgen

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

	<ItemGroup>
		<PackageReference Include="MvvmGen.PureCodeGeneration" Version="1.4.0">
			<PrivateAssets>all</PrivateAssets>
			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
		</PackageReference>
	</ItemGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>
</Project>

Generated Files​

Those are taken from $(BaseIntermediateOutputPath)\GX

// ***********************************************************************
// ⚡ MvvmGen => https://github.com/thomasclaudiushuber/mvvmgen
// Copyright © by Thomas Claudius Huber
// Licensed under the MIT license => See LICENSE file in repository root
// ***********************************************************************

#nullable enable

using System;

namespace MvvmGen
{
    /// <summary>
    /// Specifies that a DelegateCommand property in the ViewModel should be generated for a method. Set this attribute on methods of a class that has the <see cref="ViewModelAttribute"/> set.
    /// </summary>
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public class CommandAttribute : Attribute
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="CommandAttribute"/> class.
        /// </summary>
        public CommandAttribute() \{ }

        /// <summary>
        /// Initializes a new instance of the <see cref="CommandAttribute"/> class.
        /// </summary>
        /// <param name="canExecuteMethod">The name of the method with the can-execute logic</param>
        public CommandAttribute(string canExecuteMethod)
        {
            CanExecuteMethod = canExecuteMethod;
        }

        /// <summary>
        /// Gets or sets the name of the method with the can-execute logic.
        /// </summary>
        public string? CanExecuteMethod \{ get; set; }

        /// <summary>
        /// Gets or sets the name of the command property.
        /// </summary>
        public string? PropertyName \{ get; set; }
    }
}

Useful​

Download Example (.NET C#)​

tip

Download Example project mvvmgen

Share mvvmgen​

https://ignatandrei.github.io/RSCG_Examples/v2/docs/mvvmgen

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