原文地址：http://blog.csdn.net/is_zhoufeng/article/details/7641234

////wcf 接口
 
#region << 版 本 注 释 >>
/****************************************************
* 文 件 名：IServices.cs
* Copyright(c) 2011-2012 JiangGuoLiang
* CLR 版本: 4.0.30319.235
* 创 建 人：Server126
* 创建日期：2011-8-10 15:00:55
*******************************************************/
#endregion
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
 
namespace Host
{
    [ServiceContract(SessionMode = SessionMode.Required, CallbackContract = typeof(ICallBackServices))]
    public interface IServices
    {
       /// <summary>
       /// 注册客户端信息
       /// </summary>
        [OperationContract(IsOneWay = false)]
        void Register();
         
    } //End Host
 
    public interface ICallBackServices
    {
        /// <summary>
        /// 服务像客户端发送信息(异步)
        /// </summary>
        /// <param name="Message"></param>
        [OperationContract(IsOneWay = true)]
        void SendMessage(string Message);
    }
} // End IServices
//////end
 
////////实现接口
 
#region << 版 本 注 释 >>
/****************************************************
* 文 件 名：Services.cs
* Copyright(c) 2011-2012 JiangGuoLiang
* CLR 版本: 4.0.30319.235
* 创 建 人：Server126
* 创建日期：2011-8-10 15:01:07
*******************************************************/
#endregion
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.Configuration;
 
namespace Host
{
    /// <summary>
    ///  实例使用Single，共享一个
    ///  并发使用Mutiple, 支持多线程访问(一定要加锁)
    /// </summary>
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)]
    public class Services : IServices
    {
        public static readonly string SendMessageType = ConfigurationManager.ConnectionStrings["SendMessageType"].ToString();
        private static readonly object InstObj = new object();//单一实例
        //public static List<ICallBackServices> RegList = null;
        public static Dictionary<string, ICallBackServices> DicHost = null; //记录机器名称
        public static Dictionary<string, ICallBackServices> DicHostSess = null;//记录Sessionid
        public Services()
        {
            //RegList = new List<ICallBackServices>();
            DicHost = new Dictionary<string, ICallBackServices>();
            DicHostSess = new Dictionary<string, ICallBackServices>();
        }
        #region IServices 成员
 
        public void Register()
        {
            ICallBackServices client = OperationContext.Current.GetCallbackChannel<ICallBackServices>();
            string sessionid = OperationContext.Current.SessionId;//获取当前机器Sessionid--------------------------如果多个客户端在同一台机器，就使用此信息。
            string ClientHostName = OperationContext.Current.Channel.RemoteAddress.Uri.Host;//获取当前机器名称-----多个客户端不在同一台机器上，就使用此信息。
            OperationContext.Current.Channel.Closing += new EventHandler(Channel_Closing);//注册客户端关闭触发事件
            if (SendMessageType.ToUpper() == "SESSIONID")
            {
                DicHostSess.Add(sessionid, client);//添加
            }
            else
            {
                DicHost.Add(ClientHostName, client); //添加
            }
            //RegList.Add(client);//添加
        }
        void Channel_Closing(object sender, EventArgs e)
        {
            lock (InstObj)//加锁，处理并发
            {
                //if (RegList != null && RegList.Count > 0)
                //    RegList.Remove((ICallBackServices)sender);
                if (SendMessageType.ToUpper() == "SESSIONID")
                {
                    if (DicHostSess != null && DicHostSess.Count > 0)
                    {
                        foreach (var d in DicHostSess)
                        {
                            if (d.Value == (ICallBackServices)sender)//删除此关闭的客户端信息
                            {
                                DicHostSess.Remove(d.Key);
                                break;
                            }
                        }
                    }
                }
                else
                {
                    if (DicHost != null && DicHost.Count > 0) //同上
                    {
                        foreach (var d in DicHost)
                        {
                            if (d.Value == (ICallBackServices)sender)
                            {
                                DicHost.Remove(d.Key);
                                break;
                            }
                        }
                    }
                }
            }
        }
 
 
 
        #endregion
 
 
 
    } //End Host
} //End Services
 
 
////host
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.ServiceModel;
using System.Threading;
 
namespace Host
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private static readonly object InstObj = new object();
        private static bool isval = true;
        private void Form1_Load(object sender, EventArgs e)
        {
            ServiceHost host = new ServiceHost(typeof(Services));
            host.Open();
            this.Text = "wcf starte aucceeded !";
 
            #region init listbox
            Thread thread = new Thread(new ThreadStart(delegate   ///监听所有客户端连接，并添加到ListBox控件里
            {
                lock (InstObj)//加锁
                {
                    while (true)
                    {
 
                        if (Services.SendMessageType.ToUpper() == "SESSIONID")
                        {
                            if (Services.DicHostSess != null || Services.DicHostSess.Count > 0)
                            {
                                this.Invoke(new MethodInvoker(delegate { this.listBox1.Items.Clear(); }));
                                foreach (var l in Services.DicHostSess)
                                {
                                    this.Invoke(new MethodInvoker(delegate
                                    {
                                        this.listBox1.Items.Add(l.Key);
                                    }));
                                }
                            }
                        }
                        else
                        {
                            if (Services.DicHost != null || Services.DicHost.Count > 0)
                            {
                                this.Invoke(new MethodInvoker(delegate { this.listBox1.Items.Clear(); }));
                                foreach (var l in Services.DicHost)
                                {
                                    this.Invoke(new MethodInvoker(delegate
                                    {
                                        this.listBox1.Items.Add(l.Key);
                                    }));
                                }
                            }
                        }
                        Thread.Sleep(1000 * 10);
                    }
                }
            }));
            thread.IsBackground = true;
            thread.Start();
            #endregion
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            if (Services.DicHostSess == null || Services.DicHostSess.Count > 0)
            {
                if (this.listBox1.SelectedItem != null)
                {
                    if (this.listBox1.SelectedItem.ToString() != "")
                    {
                        foreach (var d in Services.DicHostSess)
                        {
                            if (d.Key == this.listBox1.SelectedItem.ToString())
                            {
                                d.Value.SendMessage(string.Format("Time: {0} message {1}", DateTime.Now, "abc"));
                            }
                        }
                    }
                }
                else { MessageBox.Show("请选择要推送给哪台客户端"); return; }
            }
            if (Services.DicHost != null || Services.DicHost.Count > 0)
            {
                if (this.listBox1.SelectedItem != null)
                {
                    if (this.listBox1.SelectedItem.ToString() != "")
                    {
                        foreach (var d in Services.DicHost)
                        {
                            if (d.Key == this.listBox1.SelectedItem.ToString())
                            {
                                d.Value.SendMessage(string.Format("Time: {0} message {1}", DateTime.Now, "abc"));
                            }
                        }
                    }
                }
                else { MessageBox.Show("请选择要推送给哪台客户端"); return; }
            }
        }
        //广播方式
        private void button2_Click(object sender, EventArgs e)
        {
            if (Services.SendMessageType.ToUpper() == "SESSIONID")//类型
            {
                foreach (var d in Services.DicHostSess)
                {
                    d.Value.SendMessage(this.textBox1.Text);
                }
            }
            else
            {
                foreach (var d in Services.DicHost)
                {
                    d.Value.SendMessage(this.textBox1.Text);
                }
            }
        }
 
    }
}
////client
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
 
namespace client
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine("create object...");
                CallBack back = new CallBack();
                InstanceContext context = new InstanceContext(back);
                ServiceReference1.ServicesClient client = new ServiceReference1.ServicesClient(context);
                Console.WriteLine("regist.....");
                client.Register();
                Console.WriteLine("aucceeded");
            }
            catch (Exception ex) { Console.WriteLine(ex.Message); }
            Console.ReadKey();
            client.Close();//关闭。
        }
    }
    class CallBack : ServiceReference1.IServicesCallback
    {
        #region IServicesCallback 成员
 
        public void SendMessage(string Message)
        {
            Console.WriteLine("[ClientTime{0:HHmmss}]Service Broadcast:{1}", DateTime.Now, Message);
        }
 
        #endregion
    }
 
}

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