一个委托的例子,外部多线程访问窗体控件

 

using System;
using System.Collections.Generic;
using System.Text;

namespace RcaNetwork
{
    public class RcaNETServer
    {
        public delegate void EventBase(string username, string IP, string state);
        public static event EventBase ClientConnEvent;
        public static void RaiseEvent(string username, string IP, string state)
        {
            if (ClientConnEvent != null)
            {
                try
                {
                    ClientConnEvent.BeginInvoke(username, IP, state, null, null);
                }
                catch { }
            }

        }
    }
}

 

using System;
using System.Collections.Generic;
using System.Text;

namespace RcaNetwork
{
    public class NETBASE : MarshalByRefObject
    {
        public string GetBLL()
        {
            RcaNETServer.RaiseEvent("test", "localhot", "LOGIN");
            return "OK";
        }
    }
}

 

    public partial class frmServer : Form
    {
        public frmServer()
        {
            InitializeComponent();
        }

        private void frmServer_Load(object sender, EventArgs e)
        {
            StartRemoting();
        }

        private void StartRemoting()
        {
            RemotingConfiguration.Configure("ServerConfig.xml", false);
            RcaNETServer.ClientConnEvent += new RcaNETServer.EventBase(ClientConnection);
        }

        //客户端连接事件
        private delegate void deClientConnection(string username, string IP, string state);
        private void ClientConnection(string username, string IP, string state)
        {
            if (listView1.InvokeRequired)
            {
                deClientConnection outdelegate = new deClientConnection(ClientConnection);
                this.BeginInvoke(outdelegate, new object[] { username, IP, state });
                return;
            }
            if (state == "LOGIN")
            {
                ListViewItem LvItem = new ListViewItem(IP);
                LvItem.SubItems.Add(username);
                listView1.Items.Add(LvItem);
            }
            else
            {
                for (int i = 0; i < listView1.Items.Count; i++)
                {
                    if (listView1.Items[i].Text == IP)
                    {
                        listView1.Items.RemoveAt(i);
                    }
                }
            }
        }
    }