MvvmAIO.Prism.SourceGenerators 0.4.1

MvvmAIO.Prism.SourceGenerators

Roslyn source generators for the Prism MVVM library — generate observable properties, delegate commands, and validation boilerplate at compile time.

Installation

<PackageReference Include="MvvmAIO.Prism.SourceGenerators" Version="0.2.0" />

Prism.Core 8.1.97 + async commands? Also install MvvmAIO.Prism.Bcl.Commands for AsyncDelegateCommand. Prism 9+ already ships these types.

Features at a Glance

Quick Start

Observable Properties

using Prism.SourceGenerators;

public partial class MainViewModel : BindableBase
{
    // Field target (all C# versions)
    [ObservableProperty]
    private string _title = "Hello";

    // Partial property target (C# 13+)
    [ObservableProperty]
    public partial int Count { get; set; }
}

Commands

public partial class MainViewModel : BindableBase
{
    [DelegateCommand]
    private void Save() { /* ... */ }

    [AsyncDelegateCommand(CanExecute = nameof(CanLoad))]
    private async Task LoadAsync(CancellationToken ct) { /* ... */ }

    private bool CanLoad() => !IsBusy;
}

Validation

using System.ComponentModel.DataAnnotations;
using Prism.SourceGenerators;

public partial class FormViewModel : BindableValidator
{
    [ObservableProperty]
    [NotifyDataErrorInfo]
    [Required, MinLength(2)]
    public partial string Username { get; set; }

    [ObservableProperty]
    [NotifyDataErrorInfo]
    [Required, EmailAddress]
    public partial string Email { get; set; }
}

The generated setter calls ValidateProperty(value, nameof(Property)) after setting the value. BindableValidator implements INotifyDataErrorInfo with ValidateProperty(), ValidateAllProperties(), ClearErrors(), and ClearAllErrors().

Property Change Notifications & Command Refresh

public partial class EditorViewModel : BindableBase
{
    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(FullName))]
    [NotifyCanExecuteChangedFor(nameof(SaveCommand))]
    private string _firstName = "";

    [DelegateCommand(CanExecute = nameof(CanSave))]
    [ObservesProperty(nameof(FirstName))]
    private void Save() { /* ... */ }

    private bool CanSave() => !string.IsNullOrEmpty(FirstName);
    public string FullName => $"{FirstName}";
}

BindableBase Generation

[BindableBase]
public partial class LightViewModel
{
    // INotifyPropertyChanged + INotifyPropertyChanging + SetProperty<T> + RaisePropertyChanged
    // all generated — no need to inherit from Prism.Mvvm.BindableBase
}

Diagnostics & Code Fixes

PSG0001–PSG0004 have IDE quick fixes: Ctrl+. → add partial (supports "Fix all in document/project/solution").

Compatibility

Package Contents

This NuGet package includes:

• Roslyn analyzers (multi-targeted: Roslyn 4.0 / 4.3 / 4.12 / 5.0)
• MvvmAIO.Prism.Core library (attributes: [ObservableProperty], [DelegateCommand], [AsyncDelegateCommand], [BindableBase], [NotifyPropertyChangedFor], [NotifyCanExecuteChangedFor], [ObservesProperty], [NotifyDataErrorInfo], BindableValidator base class)
• This is a development dependency — no runtime DLLs are added to your output

Resources

• 📖 Full documentation (GitHub)
• 📖 Web docs (Blazor)
• 🧪 Samples (Avalonia)
• 📋 Changelog
• 🐛 Issues

License

MIT — see LICENSE.