How can I clear event subscriptions in C#?

Question

Take the following C# class:

c1 {
 event EventHandler someEvent;
}

If there are a lot of subscriptions to c1\'s someEven

Answer 1

You can achieve this by using the Delegate.Remove or Delegate.RemoveAll methods.

Answer 2

Add a method to c1 that will set 'someEvent' to null.

public class c1
{
    event EventHandler someEvent;
    public ResetSubscriptions() => someEvent = null;    
}

Answer 3

Setting the event to null inside the class works. When you dispose a class you should always set the event to null, the GC has problems with events and may not clean up the disposed class if it has dangling events.

Answer 4

Remove all events, assume the event is an "Action" type:

Delegate[] dary = TermCheckScore.GetInvocationList();

if ( dary != null )
{
    foreach ( Delegate del in dary )
    {
        TermCheckScore -= ( Action ) del;
    }
}