arkein/ReactiveUI

A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform. Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, WPF, Windows Forms, Windows Phone 8, Windows Store and Universal Windows Platform (UWP).

ReactiveUI

Use the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform.

Supported Platforms

• Xamarin.iOS
• Xamarin.Android
• Xamarin.Mac
• WPF
• Windows Forms
• Windows Phone 8
• Windows Store Apps
• Universal Windows Platform (UWP)

This library is organized into several high-level assemblies:

• ReactiveUI - Core library that doesn't rely on any particular UI framework. ReactiveObject, the base ViewModel object, as well as ReactiveCollection, a more awesome ObservableCollection, is in here.

• ReactiveUI.Xaml - Classes that require references to a Xaml'ly framework, like WPF or WinRT. ReactiveCommand, an implementation of ICommand, as well as the UserError classes are in this assembly.

• ReactiveUI.Blend - This class has several Blend Behaviors and Triggers that make attaching ViewModel changes to Visual State Manager states.

• ReactiveUI.Routing - A screens and navigation framework as well as ViewModel locator. This framework helps you to write applications using IoC containers to locate views, as well as navigating back and forwards between views.

A Compelling Example

public class ColorChooserThatDoesntLikeGreen : ReactiveObject
{
  //
  // Declaring a read/write property
  //

  byte _Red;
  public byte Red {
    get { return _Red; }
    set { this.RaiseAndSetIfChanged(ref _Red, value); }
  }

  byte _Green;
  public byte Green {
    get { return _Green; }
    set { this.RaiseAndSetIfChanged(ref _Green, value); }
  }

  byte _Blue;
  public byte Blue {
    get { return _Blue; }
    set { this.RaiseAndSetIfChanged(ref _Blue, value); }
  }

  //
  // Declaring a Property that's based on an Observable
  // 

  ObservableAsPropertyHelper<Color> _Color;
  public Color Color {
    get { return _Color.Value; }
  }

  public ReactiveCommand<object> OkButton { get; protected set; }

  public ColorChooserThatDoesntLikeGreen()
  {
    var finalColor = this.WhenAny(x => x.Red, x => x.Green, x => x.Blue,
      (r,g,b) => Color.FromArgb(r.Value, g.Value, b.Value));

    _Color = finalColor.ToProperty(this, x => x.Color);

    // When the finalColor has full green, the Ok button is disabled
    OkButton = ReactiveCommand.Create(finalColor.Select(x => x.G != 255));
  }
}

Learn more

For more information on how to use ReactiveUI, check out ReactiveUI.