WeakEvent

Qoollo WeakEvent

Incorrect usage of .NET events are often lead to memory leaks. You should always remove subscription when you destroy listener. But in some cases there's no any good point to do so. For that cases you could use our MulticastWeakDelegate. It stores a weak reference to listener which not stop the GC from collection the listener object.

Usage sample:

public class SampleClass
{
    // create our weak delegate for Start notifications
    private MulticastWeakDelegate<EventHandler> _starting = new MulticastWeakDelegate<EventHandler>();

    // Wrap our weak delegate with standard event
    public event EventHandler Starting
    {
        add { _starting.Add(value); }
        remove { _starting.Remove(value); }
    }

    public void Start()
    {
        // Get delegate to notify all alive listeners
        var deleg = _starting.GetDelegate();
        if (deleg != null)
            deleg(this, EventArgs.Empty);
    }
}