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Reactive undo/redo framework for .NET.
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NuGet MyGet

ReactiveHistory is an undo/redo framework for .NET.


The main design principle for ReactiveHistory is to provide easy to use undo functionality inside your view models and allow separation from data models when following the MVVM pattern for creation of modern and portable GUI applications.

The ReactiveHistory framework enables easy implementation of undo history for observable properties and collections. To enable quick conversion from standard .NET properties and collection helper extension methods are provided. For example the ObserveWithHistory extension method is intended to be used for IObservable<T> properties and the DeleteWithHistory for IList<T> collections.

Example Usage

For examples of ReactiveHistory usage please check the samples folder. Currently there are available samples for WPF and Avalonia frameworks. The samples follow MVVM pattern, the view models use ReactiveProperty framework to implement observable properties and commands. There are also available unit tests located in tests folder with all tests for each of the use cases.



public class Layer : BaseObject
    private ObservableCollection<LineShape> _shapes;

    public ObservableCollection<LineShape> Shapes
        get { return _shapes; }
        set { Update(ref _shapes, value); }

    public Layer(object owner = null, string name = null)
        this.Owner = owner;
        this.Name = name;
        this.Shapes = new ObservableCollection<LineShape>();


public class LayerViewModel : IDisposable
    private CompositeDisposable Disposable { get; set; }
    public ReactiveProperty<string> Name { get; set; }
    public ReadOnlyReactiveCollection<LineShapeViewModel> Shapes { get; set; }
    public ReactiveCommand UndoCommand { get; set; }
    public ReactiveCommand RedoCommand { get; set; }
    public ReactiveCommand ClearCommand { get; set; }

    public LayerViewModel(Layer layer, IHistory history)
        Disposable = new CompositeDisposable();

        this.Name = layer.ToReactivePropertyAsSynchronized(l => l.Name)
            .SetValidateNotifyError(name => string.IsNullOrWhiteSpace(name) ? "Name can not be null or whitespace." : null)

        this.Shapes = layer.Shapes
            .ToReadOnlyReactiveCollection(x => new LineShapeViewModel(x, history))

        this.Name.ObserveWithHistory(name => layer.Name = name, layer.Name, history).AddTo(this.Disposable);
        UndoCommand = new ReactiveCommand(history.CanUndo, false);
        UndoCommand.Subscribe(_ => history.Undo()).AddTo(this.Disposable);

        RedoCommand = new ReactiveCommand(history.CanRedo, false);
        RedoCommand.Subscribe(_ => history.Redo()).AddTo(this.Disposable);

        ClearCommand = new ReactiveCommand(history.CanClear, false);
        ClearCommand.Subscribe(_ => history.Clear()).AddTo(this.Disposable);

    public void Dispose()


var layer1 = new Layer("layer1");

var line1 = new LineShape(layer1, "line1");
line1.Start = new PointShape(100, 100, line1, "start11");
line1.End = new PointShape(200, 100, line1, "end11");

var line2 = new LineShape(layer1, "line2");
line2.Start = new PointShape(100, 200, line2, "start21");
line2.End = new PointShape(200, 200, line2, "end21");


var history = new StackHistory();
var layerViewModel = new LayerViewModel(layer1, history).AddTo(disposable);

Building ReactiveHistory

First, clone the repository or download the latest zip.

git clone
git submodule update --init --recursive


Open ReactiveHistory.sln in selected IDE and run Build command.


ReactiveHistory is delivered as a NuGet package.

You can find the packages here NuGet or by using nightly build feed:

  • Add to your package sources
  • Update your package using ReactiveHistory feed

You can install the package like this:

Install-Package ReactiveHistory -Pre

Package Dependencies

Package Sources


ReactiveHistory is licensed under the MIT license.

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