ReactiveProperty.WPF 8.2.0

.NET 6.0 .NET Framework 4.7.2
dotnet add package ReactiveProperty.WPF --version 8.2.0
NuGet\Install-Package ReactiveProperty.WPF -Version 8.2.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="ReactiveProperty.WPF" Version="8.2.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add ReactiveProperty.WPF --version 8.2.0
#r "nuget: ReactiveProperty.WPF, 8.2.0"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install ReactiveProperty.WPF as a Cake Addin
#addin nuget:?package=ReactiveProperty.WPF&version=8.2.0

// Install ReactiveProperty.WPF as a Cake Tool
#tool nuget:?package=ReactiveProperty.WPF&version=8.2.0

Japanese

ReactiveProperty

ReactiveProperty provides MVVM and asynchronous support features under Reactive Extensions. Target framework is .NET 6.0, .NET Core 3.1, .NET Framework 4.7.2 and .NET Standard 2.0.

Build and Release

ReactiveProperty overview

ReactiveProperty is a very powerful and simple library.

Delay and Select

This sample app's ViewModel code is as below:

public class MainPageViewModel
{
    public ReactiveProperty<string> Input { get; }
    public ReadOnlyReactiveProperty<string> Output { get; }
    public MainPageViewModel()
    {
        Input = new ReactiveProperty<string>("");
        Output = Input
            .Delay(TimeSpan.FromSeconds(1))
            .Select(x => x.ToUpper())
            .ToReadOnlyReactiveProperty();
    }
}

It's LINQ and Rx magic.

All steps are written in the "Getting Started" section in the ReactiveProperty documentation.

This library's concept is "Fun programing". ViewModel code using ReactiveProperties is very simple.

ViewModel's popular implementation:

public class AViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string _name;
    public string Name
    {
        get => _name;
        set
        {
            _name = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Name)));

            // Update a command status
            DoSomethingCommand.RaiseCanExecuteChanged();
        }
    }

    private string _memo;
    public string Memo
    {
        get => _memo;
        set
        {
            _memo = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Memo)));

            // Update a command status
            DoSomethingCommand.RaiseCanExecuteChanged();
        }
    }

    // DelegateCommand is plane ICommand implementation.
    public DelegateCommand DoSomethingCommand { get; }

    public AViewModel()
    {
        DoSomethingCommand = new DelegateCommand(
            () => { ... },
            () => !string.IsNullOrEmpty(Name) && !string.IsNullOrEmpty(Memo)
        );
    }
}

Binding code:

<TextBlock Text="{Binding Name}">
<TextBlock Text="{Binding Memo}">

ViewModel's implementation using ReactiveProperty:

public class AViewModel
{
    public ReactiveProperty<string> Name { get; }
    public ReactiveProperty<string> Memo { get; }
    public ReactiveCommand DoSomethingCommand { get; }

    public AViewModel()
    {
        Name = new ReactiveProperty<string>()
            .SetValidateNotifyError(x => string.IsNullOrEmpty(x) ? "Invalid value" : null);
        Memo = new ReactiveProperty<string>()
            .SetValidateNotifyError(x => string.IsNullOrEmpty(x) ? "Invalid value" : null);
        DoSomethingCommand = new[]
            {
                Name.ObserveHasErrors,
                Memo.ObserveHasErrors,
            }
            .CombineLatestValuesAreAllFalse()
            .ToReactiveCommand()
            .WithSubscribe(() => { ... });
    }
}

Binding code:

<TextBlock Text="{Binding Name.Value}">
<TextBlock Text="{Binding Memo.Value}">

It's very simple.

ReactiveProperty doesn't provide base class by ViewModel, which means that ReactiveProperty can be used together with another MVVM libraries such as Prism, Microsoft.Toolkit.Mvvm and etc.

Documentation

ReactiveProperty documentation

NuGet packages

Package Id Version and downloads Description
ReactiveProperty The package includes all core features, and the target platform is .NET Standard 2.0. It fits almost all situations.
ReactiveProperty.Core The package includes minimum classes such as ReactivePropertySlim<T> and ReadOnlyReactivePropertySlim<T>. And this doesn't have any dependency even System.Reactive. If you don't need Rx features, then it fits.
ReactiveProperty.WPF The package includes EventToReactiveProperty and EventToReactiveCommand for WPF. This is for .NET Core 3.0 or later and .NET Framework 4.7.2 or later.
ReactiveProperty.Blazor The package includes validation support for EditForm component of Blazor with ReactiveProperty validation feature. This is for .NET 6.0 or later.
ReactiveProperty.UWP The package includes EventToReactiveProperty and EventToReactiveCommand for UWP.
ReactiveProperty.XamarinAndroid The package includes many extension methods to create IObservable from events for Xamarin.Android native.
ReactiveProperty.XamariniOS The package includes many extension methods to bind ReactiveProperty and ReactiveCommand to Xamarin.iOS native controls.

Support

I'm not watching StackOverflow and other forums to support ReactiveProperty, so please feel free to post questions at Github issues. I'm available Japanese(1st language) and English(2nd language).

If too many questions are posted, then I plan to separate posting place about feature requests, issues, questions.

Author info

Yoshifumi Kawai a.k.a. @neuecc is Founder/CEO/CTO of Cysharp, Inc in Tokyo, Japan. Awarded Microsoft MVP for Developer Technologies since April, 2011. He is an original owner of ReactiveProperty.

Takaaki Suzuki a.k.a. @xin9le software developer in Fukui, Japan. Awarded Microsoft MVP for Developer Technologies since July, 2012.

Kazuki Ota a.k.a. @okazuki software developer in Tokyo, Japan. Awarded Microsoft MVP for Windows Development since July 2011 to Feb 2017. Now, working at Microsoft Japan.

Product Versions
.NET net6.0-windows7.0 net7.0-windows7.0
.NET Framework net472 net48
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on ReactiveProperty.WPF:

Package Downloads
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Package Description

GitHub repositories

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Version Downloads Last updated
8.2.0 468 11/10/2022
8.1.2 4,705 6/6/2022
8.1.2-pre202206051057 70 6/5/2022
8.1.1 600 5/27/2022
8.1.0 987 4/30/2022
8.1.0-pre202204290912 80 4/29/2022
8.1.0-pre202204290644 71 4/29/2022
8.0.5 1,140 3/24/2022
8.0.5-pre202203191529 71 3/19/2022
8.0.5-pre202203191312 70 3/19/2022
8.0.4 798 3/5/2022
8.0.4-pre202203040658 77 3/4/2022
8.0.3 5,950 12/5/2021
8.0.3-pre202112031043 772 12/3/2021
8.0.3-pre202112030833 710 12/3/2021
8.0.2 1,400 11/21/2021
8.0.1 377 11/20/2021
8.0.1-pre202111200140 482 11/20/2021
8.0.0 501 11/9/2021
8.0.0-pre202111090825 110 11/9/2021
8.0.0-pre202110240626 150 10/24/2021
8.0.0-pre202110161410 220 10/16/2021
8.0.0-pre202110160852 130 10/16/2021
8.0.0-pre202110160831 150 10/16/2021
8.0.0-pre202110131323 158 10/13/2021
8.0.0-pre202110071401 167 10/7/2021
8.0.0-pre202110060758 176 10/6/2021
8.0.0-pre202109190434 238 9/19/2021
8.0.0-pre202109160117 174 9/16/2021
8.0.0-pre202108141424 199 8/14/2021
8.0.0-pre202107040319 232 7/4/2021
7.12.0 9,839 8/6/2021
7.11.0 3,417 5/31/2021
7.10.0 1,718 4/29/2021
7.9.0 5,029 4/20/2021
7.8.3 1,088 3/24/2021
7.8.2 273 3/23/2021
7.8.1 563 3/11/2021
7.8.1-pre202103031133 179 3/3/2021
7.8.0 1,112 2/21/2021
7.8.0-pre202102210255 150 2/21/2021
7.8.0-pre202102201703 158 2/20/2021
7.7.1 285 2/19/2021
7.7.1-pre202102190925 141 2/19/2021
7.7.0 4,828 1/26/2021
7.6.1 527 1/15/2021
7.6.0 412 1/13/2021
7.5.1 2,097 10/19/2020
7.5.0 375 10/17/2020
7.5.0-pre202010141113 219 10/14/2020
7.4.1 5,405 9/23/2020
7.4.0 417 9/18/2020
7.3.0 372 9/17/2020
7.2.1 5,509 9/11/2020
7.2.0 919 8/4/2020
7.1.0 1,479 5/26/2020
7.1.0-pre202005251107 280 5/25/2020
7.0.1 523 5/14/2020
7.0.1-pre202005131606 250 5/13/2020
7.0.0 667 5/5/2020
7.0.0-ci20200503102823 286 5/3/2020
7.0.0-ci20200503100450 269 5/3/2020