public static void Unsubscribe <TOpenEventHandler, TStrongHandler>(
DelegateCollectionBase <TOpenEventHandler, TStrongHandler> handlers,
Delegate handler)
where TOpenEventHandler : Delegate
where TStrongHandler : struct
{
if (handler is null)
{
throw new ArgumentNullException(nameof(handler));
}
if (handlers is null)
{
return;
}
var singleHandlers = handler
.GetInvocationList();
lock (handlers)
{
foreach (var singleHandler in singleHandlers)
{
handlers.Remove(singleHandler);
}
handlers.CollectDeleted();
}
}
public static IEnumerable <TStrongHandler> GetValidHandlers <TOpenEventHandler, TStrongHandler>(
DelegateCollectionBase <TOpenEventHandler, TStrongHandler> handlers)
where TOpenEventHandler : Delegate
where TStrongHandler : struct
{
if (handlers is null)
{
return(Enumerable.Empty <TStrongHandler>());
}
List <TStrongHandler> validHandlers;
lock (handlers)
{
validHandlers = new List <TStrongHandler>(handlers.Count);
for (int i = 0; i < handlers.Count; i++)
{
var weakHandler = handlers[i];
if (weakHandler != null)
{
if (weakHandler.TryGetStrongHandler() is TStrongHandler handler)
{
validHandlers.Add(handler);
}
else
{
handlers.Invalidate(i);
}
}
}
handlers.CollectDeleted();
}
return(validHandlers);
}