https://github.com/ghuntley/weakeventlistener

The WeakEventListener allows the owner to be garbage collected if its only remaining link is an event handler.
https://github.com/ghuntley/weakeventlistener

iweakeventlistener uap uwp weakeventmanager xamarin xamarin-android xamarin-ios xamarin-mac

Last synced: about 1 month ago
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The WeakEventListener allows the owner to be garbage collected if its only remaining link is an event handler.

• Host: GitHub
• URL: https://github.com/ghuntley/weakeventlistener
• Owner: ghuntley
• License: mit
• Created: 2017-08-07T07:18:49.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-08-07T08:23:38.000Z (over 7 years ago)
• Last Synced: 2025-03-15T18:53:11.394Z (about 2 months ago)
• Topics: iweakeventlistener, uap, uwp, weakeventmanager, xamarin, xamarin-android, xamarin-ios, xamarin-mac
• Language: C#
• Homepage: https://ghuntley.com/
• Size: 13.7 KB
• Stars: 25
• Watchers: 3
• Forks: 4
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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# WeakEventListener

The WeakEventListener allows the owner to be garbage collected if its only remaining link is an event handler. See https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/weak-event-patterns for more information; the wisdom found on that page is applicable for other platforms inc UWP, Xamarin.Mac, Xamarin.iOS & Xamarin.Android.

# Supported Platforms

* netstandard v1.1 (and up)

# Installation

Installation is done via NuGet:

    PM> Install-Package WeakEventListener

# Usage

```csharp

public class SampleClass

{

    public event EventHandler Raisevent;

    public void DoSomething()

    {

        OnRaiseEvent();

    }

    protected virtual void OnRaiseEvent()

    {

        Raisevent?.Invoke(this, EventArgs.Empty);

    }

}

public void Test_WeakEventListener_Events()

{

    bool isOnEventTriggered = false;

    bool isOnDetachTriggered = false;

    SampleClass sample = new SampleClass();

    WeakEventListener weak = new WeakEventListener(sample);

    weak.OnEventAction = (instance, source, eventArgs) => { isOnEventTriggered = true; };

    weak.OnDetachAction = (listener) => { isOnDetachTriggered = true; };

    sample.Raisevent += weak.OnEvent;

    sample.DoSomething();

    Assert.True(isOnEventTriggered);

    weak.Detach();

    Assert.True(isOnDetachTriggered);

}

```

# With thanks to

* The WeakEventListener was promoted from the [UWPCommunityToolkit](https://github.com/Microsoft/UWPCommunityToolkit) to become this package.