无效的线程操作，Invoke方法不起作用

Question

我有一个在线聊天代码，系统上有一个已登录用户的列表。在listBox中添加用户名时出现问题；错误如下：Invalid thread operation: control 'lbClients' accessed from a thread that is not the one in which it was created.

我尝试了Invoke方法，但是它也不起作用。使用Invoke方法，服务器将用户添加到列表中，但是当用户断开连接时，登录到服务器的用户列表不会刷新。该怎么办？

public void ServiceClient()
    {
        Socket client = clientsocket;
        bool keepalive = true;

        while (keepalive)
        {
            Byte[] buffer = new Byte[1024];
            client.Receive(buffer);
            string clientcommand = System.Text.Encoding.ASCII.GetString(buffer);

            string[] tokens = clientcommand.Split(new Char[]{'|'});
            Console.WriteLine(clientcommand);

            if (tokens[0] == "CONN")
            {
                for(int n=0; n<clients.Count; n++) {
                    Client cl = (Client)clients[n];
                    SendToClient(cl, "JOIN|" + tokens[1]);
                }
                EndPoint ep = client.RemoteEndPoint;
                //string add = ep.ToString();
                Client c = new Client(tokens[1], ep, clientservice, client);
                this.Invoke(new Action(() => clients.Add(c)));
                string message = "LIST|" + GetChatterList() +"\r\n";
                SendToClient(c, message);
                try
                {
                    lbClients.Items.Add(c);
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.Message);
                }

            }
            else if (tokens[0] == "CHAT")
            {
                for(int n=0; n<clients.Count; n++)
                {
                    Client cl = (Client)clients[n];
                    SendToClient(cl, clientcommand);
                }
            }
            else if (tokens[0] == "PRIV")
            {
                string destclient = tokens[3];
                for(int n=0; n<clients.Count; n++) {
                    Client cl = (Client)clients[n];
                    if(cl.Name.CompareTo(tokens[3]) == 0)
                        SendToClient(cl, clientcommand);
                    if(cl.Name.CompareTo(tokens[1]) == 0)
                        SendToClient(cl, clientcommand);
                }
            }
            else if (tokens[0] == "GONE")
            {
                int remove = 0;
                bool found = false;
                int c = clients.Count;
                for(int n=0; n<c; n++)
                {
                    Client cl = (Client)clients[n];
                    SendToClient(cl, clientcommand);
                    if(cl.Name.CompareTo(tokens[1]) == 0)
                    {
                        remove = n;
                        found = true;
                        lbClients.Items.Remove(cl);
                        //lbClients.Items.Remove(cl.Name + " : " + cl.Host.ToString());
                    }
                }
                if(found)
                    this.Invoke(new Action(() => clients.RemoveAt(remove)));
                client.Close();
                keepalive = false;
            }
            else
            {
                int remove = 0;
                bool found = false;
                int c = clients.Count;
                for (int n = 0; n < c; n++)
                {
                    Client cl = (Client)clients[n];
                    //SendToClient(cl, clientcommand);
                    if (cl.Name.CompareTo(tokens[1]) == 0)
                    {
                        remove = n;
                        found = true;
                        lbClients.Items.Remove(cl);
                        //lbClients.Items.Remove(cl.Name + " : " + cl.Host.ToString());
                    }
                }
                if (found)
                    clients.RemoveAt(remove);
                client.Close();
                keepalive = false;
            }
        } 
    }