LiteObservableEvents 1.0.0

.NET 6.0 .NET Standard 2.0 .NET Framework 4.7.2

dotnet add package LiteObservableEvents --version 1.0.0

NuGet\Install-Package LiteObservableEvents -Version 1.0.0

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="LiteObservableEvents" Version="1.0.0" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="LiteObservableEvents" Version="1.0.0" />
                    

                            Directory.Packages.props

<PackageReference Include="LiteObservableEvents" />
                    

                            Project file

For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package.

paket add LiteObservableEvents --version 1.0.0

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: LiteObservableEvents, 1.0.0"

#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.

#:package LiteObservableEvents@1.0.0

#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package.

#addin nuget:?package=LiteObservableEvents&version=1.0.0
                    

                            Install as a Cake Addin

#tool nuget:?package=LiteObservableEvents&version=1.0.0
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

LiteObservableEvents

Lightweight observable event hub and source-generated event bridges for .NET, with optional weak-reference (holder) lifecycle and MVVM-style interactions.

Features

Event hubs: StrongReferenceEventHub and WeakReferenceEventHub for central subscription management.
Holder-based lifecycle: Subscribe with a holder object; when the holder is GC'd, subscriptions are cleaned up automatically (WeakReferenceMessenger-style).
Source-generated Events(): Generate type-safe, observable wrappers for instance/static events via source generator.
Interactions: LiteObservableEvents.Interactions for ViewModel–View communication (e.g. confirmation dialogs).

Demos (WpfApp)

The WpfApp project is a small WPF demo that shows the following.

1. WeakReferenceEventHub + holder

Subscriptions use holder: this (the window). On window close, all subscriptions for that holder are disposed. Cleanup() or new subscriptions remove dead holder subscriptions.

this.Events().Closed
    .Subscribe(_ =>
    {
        _confirmInteractionRegistration?.Dispose();
        WeakReferenceEventHub.Default.UnsubscribeAll(this);
        ViewModel?.Dispose();
    });

2. Static event subscription

Hand-written add/remove:

WeakReferenceEventHub.Default.Subscribe<bool, bool>(
    holder: this,
    addHandler: h => MyStaticObject.MyStaticEvent += h,
    removeHandler: h => MyStaticObject.MyStaticEvent -= h,
    onNext: _ => Debug.WriteLine("Raised - MyStaticObject.MyStaticEvent += h"));

Reflection:

WeakReferenceEventHub.Default.Subscribe<bool>(
    holder: this,
    target: typeof(MyStaticObject),
    eventName: nameof(MyStaticObject.MyStaticEvent),
    onNext: _ => Debug.WriteLine("Raised - MyStaticObject.MyStaticEvent reflection"));

3. Static object's event (singleton)

Source-generated Events():

WeakReferenceEventHub.Default.Subscribe(this, MySingletonObject.Instance.Events().MyEvent, _ =>
{
    Debug.WriteLine("Raised - MySingletonObject.Instance.Events().MyEvent source-generated");
});

Hand-written add/remove:

WeakReferenceEventHub.Default.Subscribe<bool, bool>(
    holder: this,
    addHandler: h => MySingletonObject.Instance.MyEvent += h,
    removeHandler: h => MySingletonObject.Instance.MyEvent -= h,
    onNext: _ => Debug.WriteLine("Raised - MySingletonObject.Instance.MyEvent += h"));

Reflection:

WeakReferenceEventHub.Default.Subscribe<bool>(
    holder: this,
    target: MySingletonObject.Instance,
    eventName: nameof(MySingletonObject.MyEvent),
    onNext: _ => Debug.WriteLine("Raised - MySingletonObject.Instance.MyEvent reflection"));

4. Interactions (ViewModel ↔ View)

ViewModel exposes an Interaction<string, bool>. View registers a handler (e.g. MessageBox); a command calls Handle(...).ToTask() and shows the result.

View — register handler:

_confirmInteractionRegistration = ViewModel.ConfirmAction.RegisterHandler(context =>
{
    var result = MessageBox.Show(context.Input, "Confirm", MessageBoxButton.YesNo, MessageBoxImage.Question);
    context.SetOutput(result == MessageBoxResult.Yes);
});

ViewModel — declare and invoke:

public Interaction<string, bool> ConfirmAction { get; } = new();

[RelayCommand]
private async Task AskConfirmAsync()
{
    var approved = await ConfirmAction.Handle("Do you want to continue?").ToTask();
    LastResult = approved ? "User chose: Yes" : "User chose: No";
}

5. Raising events from ViewModel

A command toggles a bool and raises both static and singleton events; the UI binds to the toggle value.

[ObservableProperty]
private bool _staticEventToggle;

[RelayCommand]
private void RaiseStaticEvents()
{
    StaticEventToggle = !StaticEventToggle;
    MyStaticObject.RaiseSomeEvent(StaticEventToggle);
    MySingletonObject.Instance.RaiseSomeEvent(StaticEventToggle);
}

Run WpfApp and use the two buttons to try the confirmation interaction and the static/static-object event raise; check Debug output for subscription messages.

Attribution

Portions of this project are derived from or inspired by:

ReactiveUI (e.g. Interaction pattern)
reactivemarbles/ObservableEvents

See LICENSE for details.

License

MIT

Product	Compatible and additional computed target framework versions.
.NET	net5.0 was computed. net5.0-windows was computed. net6.0 is compatible. 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 is compatible. 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 is compatible. 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. net9.0 is compatible. net9.0-android was computed. net9.0-browser was computed. net9.0-ios was computed. net9.0-maccatalyst was computed. net9.0-macos was computed. net9.0-tvos was computed. net9.0-windows was computed. net10.0 is compatible. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-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 is compatible.
.NET Framework	net461 was computed. net462 was computed. net463 was computed. net47 was computed. net471 was computed. net472 is compatible. net48 is compatible. 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.
Xamarin.Mac	xamarinmac was computed.
Xamarin.TVOS	xamarintvos was computed.
Xamarin.WatchOS	xamarinwatchos was computed.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

.NETFramework 4.7.2
- System.Reactive (>= 6.1.0)
.NETFramework 4.8
- System.Reactive (>= 6.1.0)
.NETStandard 2.0
- System.Reactive (>= 6.1.0)
.NETStandard 2.1
- System.Reactive (>= 6.1.0)
net10.0
- System.Reactive (>= 6.1.0)
net6.0
- System.Reactive (>= 6.1.0)
net7.0
- System.Reactive (>= 6.1.0)
net8.0
- System.Reactive (>= 6.1.0)
net9.0
- System.Reactive (>= 6.1.0)

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
1.0.0	91	2/9/2026
1.0.0-beta2	91	2/9/2026
1.0.0-beta1	95	2/6/2026

https://github.com/emako/LiteObservableEvents/releases

LiteObservableEvents 1.0.0

LiteObservableEvents

Features

Demos (WpfApp)

1. WeakReferenceEventHub + holder

2. Static event subscription

3. Static object's event (singleton)

4. Interactions (ViewModel ↔ View)

5. Raising events from ViewModel

Attribution

License

.NETFramework 4.7.2

.NETFramework 4.8

.NETStandard 2.0

.NETStandard 2.1

net10.0

net6.0

net7.0

net8.0

net9.0

NuGet packages

GitHub repositories