ISynchronizeInvoke implementation example

Put the following code for classes you want to implement ISynchronizeInvoke should do the job

        private readonly object _sync= new object();

        public IAsyncResult BeginInvoke(Delegate method, object[] args)
        {
            var result = new SimpleAsyncResult();

            ThreadPool.QueueUserWorkItem(
                delegate
            {

                result.AsyncWaitHandle = new ManualResetEvent(false);
                try
                {
                    result.AsyncState = Invoke(method, args);
                }
                catch (Exception exception)
                {
                    Debug.WriteLine(exception.Message);
                    Debug.WriteLine(exception.StackTrace);
                    result.Exception = exception;
                }
                result.IsCompleted = true;
            });


            return result;
        }


        public object EndInvoke(IAsyncResult result)
        {
            if (!result.IsCompleted)
            {
                result.AsyncWaitHandle.WaitOne();
            }


            return result.AsyncState;
        }


        public object Invoke(Delegate method, object[] args)
        {
            lock (_sync)
            {
                return method.DynamicInvoke(args);
            }
        }


        public bool InvokeRequired
        {
            get { return true; }
        }
        public class SimpleAsyncResult : IAsyncResult
        {
            private object _state;


            public bool IsCompleted { get; set; }


            public WaitHandle AsyncWaitHandle { get; internal set; }


            public object AsyncState
            {
                get
                {
                    if (Exception != null)
                    {
                        throw Exception;
                    }
                    return _state;
                }
                internal set { _state = value; }
            }

            public bool CompletedSynchronously
            {
                get { return IsCompleted; }
            }


            internal Exception Exception { get; set; }

        }
        
  

Want to read more?

http://blogs.msdn.com/b/jaredpar/archive/2008/01/07/isynchronizeinvoke-now.aspx

http://gurkashi.blogspot.sg/2011/01/hi-all-in-this-post-i-will-demonstrate.html