Example implementation of weak events using .NET's WeakEventManager

Question

Is there an example implementation of weak events using .NET\'s WeakEventManager?

I\'m trying to implement it by following the \"Notes to Inheritors\" in the documentati

Answer 1

Sharp Observation is an open source project that has an easy to use implementation. You might want to take a look at their code or just use it as-is.

Usage

The MakeWeak() method returns a new delegate which invokes the same target as the original delegate, but holds a weak reference to the target so that the listener is not kept alive by the delegate:

var handler= new PropertyChangingEventHandler(listener.HandleChange);
observable.PropertyChanging += handler.MakeWeak();

Limitations

The current implementation has the following restrictions on delegates:

• Return values are not supported.
• Arguments of Out and Ref are not supported.