Reactive.Annex 2.0.0

dotnet add package Reactive.Annex --version 2.0.0                
NuGet\Install-Package Reactive.Annex -Version 2.0.0                
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="Reactive.Annex" Version="2.0.0" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Reactive.Annex --version 2.0.0                
#r "nuget: Reactive.Annex, 2.0.0"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Reactive.Annex as a Cake Addin
#addin nuget:?package=Reactive.Annex&version=2.0.0

// Install Reactive.Annex as a Cake Tool
#tool nuget:?package=Reactive.Annex&version=2.0.0                


New types and extension methods built on top of System.Reactive.

License Version Downloads

Getting Started

  1. Add the Reactive.Annex nuget package to your project.

  2. Then, make sure you are using the System.Reactive.Linq and System.Reactive.Concurrency namespaces in your file.

You are now ready to use these handy extension methods!

Next Steps

If your project uses Uno Platform, you can also add the following packages.

  • Reactive.Annex.Uno.WinUI for projects using Uno.WinUI or WinUI.

With this, You can create a MainDispatcherScheduler, which implements the IDispatcherScheduler interface.

WinUI / Uno.WinUI

Microsoft.UI.Dispatching.DispatcherQueue dispatcherQueue = //...
var scheduler = new MainDispatcherScheduler(dispatcherQueue);


Specialized Interfaces for DI

You can use IBackgroundScheduler and IDispatcherScheduler to clearly differentiate background schedulers from dispatcher schedulers. Both interfaces implement IScheduler. This is useful when using dependency injection.


MainDispatcherScheduler is an implementation of IDispatcherScheduler. It's available from the Reactive.Annex.Uno and Reactive.Annex.Uno.WinUI packages.

  • Use Reactive.Annex.Uno in projets using UWP or Uno.UI.
  • Use Reactive.Annex.Uno.WinUI in projects using WinUI or Uno.WinUI.

Extension Methods on IObservable

  • FirstAsync: Creates a task from an IObservable with the first value observed.
  • FromAsync: Converts an async method into an observable sequence.
  • SelectManyDisposePrevious: Runs an async action each time your observable sequence produces a new value while making sure to cancel the previous action if it's still running.
  • SkipWhileSelectMany: Projects element of an observable sequence to another observable sequence, skipping new elements while resulting observable is not completed, and merges the resulting observable sequences into one observable sequence.

Extension Methods on IScheduler

  • ScheduleTask: Schedules work using an asynchronous method, allowing for cooperative scheduling in an imperative coding style.
  • Run: Awaits a task execution on the specified scheduler, providing the result.


  • Reactive.Annex.Uno for projects using Uno.UI and UWP.

UWP / Uno.UI

Windows.UI.Core coreDispatcher = //...
var scheduler = new MainDispatcherScheduler(coreDispatcher);


Please consult the CHANGELOG for more information about version history.


This project is licensed under the Apache 2.0 license - see the LICENSE file for details.


Please read for details on the process for contributing to this project.

Be mindful of our Code of Conduct.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
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Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
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NuGet packages (7)

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Version Downloads Last updated
2.0.0 5,765 1/2/2024
2.0.0-feature.Uno5.4 93 12/7/2023
2.0.0-feature.Uno5.2 1,310 11/28/2023
1.0.2 9,230 9/26/2023
1.0.1 746 9/15/2023
0.6.0-dev.50 28,392 10/26/2022
0.5.0-feature.dotnet6.38 203 9/22/2022
0.5.0-feature.dotnet6.30 118 9/21/2022
0.5.0-dev.46 1,871 10/13/2022
0.5.0-dev.44 156 10/13/2022
0.5.0-dev.41 4,851 10/11/2022
0.5.0-dev.39 554 9/26/2022
0.5.0-dev.29 58,938 3/31/2022 147 3/15/2022
0.4.0-dev.27 290 3/15/2022 8,709 12/21/2021
0.3.0-dev.18 59,438 3/16/2021
0.2.0-dev.16 401 11/2/2020
0.2.0-dev.14 18,139 6/26/2020
0.1.0 255 9/14/2023