Question

Good morning.
Take this simple scenario: I’ve got a NetClient that connects itself to a remote server, using a void method Connect(); when done, NetClient rises Connected event.

I need to wrap this NetClient to another caller that cannot manage async logic like this: this caller wants a sync Connect() method that return true if ok (for simplicity don’t think about connection errors for now).

The code look like this:

    public class Client
    {
        NetClient m_NetClient = new NetClient();

        public void Connect(string ip, int port)
        {
            m_NetClient = new NetClient();
            m_NetClient.Connected += _NetClient_Connected;
            m_NetClient.Connect(ip, port);
        }

        private void _NetClient_Connected(object sender, EventArgs e)
        {
            //...
        }
    }

What can I do to make this logic sync? I need to rise a new thread in event handler than use something like Monitor class?
Can someone give me his opionin/code for achieve this target?

Thank you all!

Answer 1

A AutoResetEvent should do the trick.

public class Client
        {
            NetClient m_NetClient = new NetClient();
            AutoResetEvent _lock = new AutoResetEvent(false);
            bool result;

            public bool Connect(string ip, int port)
            {
                m_NetClient = new NetClient();
                m_NetClient.Connected += _NetClient_Connected;
                m_NetClient.Connect(ip, port);
                _lock.WaitOne();//wait for thread to finish
                return result;
            }

            private void _NetClient_Connected(object sender, EventArgs e)
            {
                //...
                result = e.Result;
                _lock.Set(); //inform waiters
            }
        }