使用用WCF中的双工（Duplex）模式将广告图片推送到每个Winform客户端机子上

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.IO;
using System.ServiceModel;

namespace WinFormClient
{

public partial class FormClient : Form
{
public FormClient()
{
InitializeComponent();
this.Text = "当前客户端编号为："+DateTime.Now.ToString("yyyyMMddHHmmss");
try
{
Console.WriteLine("create object...");
CallBack back = new CallBack();
InstanceContext context = new InstanceContext(back);
ServiceReference1.ServicesClient client = new ServiceReference1.ServicesClient(context);
Console.WriteLine("regist.....");
back.showPic += new CallBack.ShowPic(ShowPicMethod);
client.Register();
Console.WriteLine("aucceeded");
//this.ReceivePic.Image = back.Pic;
}
catch (Exception ex) { Console.WriteLine(ex.Message); }
}

public void ShowPicMethod(Bitmap bitmap)
{
this.ReceivePic.Image = bitmap;
}
}

public class CallBack : ServiceReference1.IServicesCallback
{
public delegate void ShowPic(Bitmap bitmap);
public event ShowPic showPic;

#region IServicesCallback 成员
public void SendMessage(string Message)
{
Console.WriteLine("[ClientTime{0:HHmmss}]Service Broadcast:{1}", DateTime.Now, Message);
}

public void SendPicStream(ServiceReference1.MessageEntity messageEntity)
{
this.showPic(GetImage(messageEntity.PicStream));
}
#endregion

#region 将图片二进制流转换为图片
public static Bitmap GetImage(byte[] ImageDatas)
{
try
{
//如果是字符串的话
//byte[] resultBytes = Convert.FromBase64String(ImageDatas);
using (MemoryStream ImageMS = new MemoryStream())
{
ImageMS.Write(ImageDatas, 0, ImageDatas.Length);
Bitmap resultBitmap = new Bitmap(ImageMS);
return resultBitmap;
}
}
catch
{
return null;
}
}
#endregion
}
}