protected static object GetTarget(Delegate callback)
{
if (callback == null)
{
throw new ArgumentNullException("callback");
}
ContextItemManager.ICallbackProxy callbackProxy = callback.Target as ContextItemManager.ICallbackProxy;
if (callbackProxy != null)
{
return(callbackProxy.OriginalTarget);
}
return(callback.Target);
}
protected static Delegate RemoveCallback(Delegate existing, Delegate toRemove)
{
if (existing == null)
{
return((Delegate)null);
}
if (toRemove == null)
{
return(existing);
}
ContextItemManager.ICallbackProxy callbackProxy1 = toRemove.Target as ContextItemManager.ICallbackProxy;
if (callbackProxy1 == null)
{
return(Delegate.Remove(existing, toRemove));
}
toRemove = callbackProxy1.OriginalDelegate;
Delegate[] invocationList = existing.GetInvocationList();
bool flag = false;
for (int index = 0; index < invocationList.Length; ++index)
{
Delegate @delegate = invocationList[index];
ContextItemManager.ICallbackProxy callbackProxy2 = @delegate.Target as ContextItemManager.ICallbackProxy;
if (callbackProxy2 != null)
{
@delegate = callbackProxy2.OriginalDelegate;
}
if (@delegate.Equals((object)toRemove))
{
invocationList[index] = (Delegate)null;
flag = true;
}
}
if (flag)
{
existing = (Delegate)null;
foreach (Delegate b in invocationList)
{
if (b != null)
{
existing = existing != null?Delegate.Combine(existing, b) : b;
}
}
}
return(existing);
}
