如何实现多播？

Question

请给个完整源码，谢谢！

Answer 1

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;namespace UDPReceiver
{
public delegate void OnReceiveEventHandler(string xmlPack); /// <summary>
/// MultiCast 的摘要说明。
/// </summary>
public class MultiCast
{
private string addr;
private int port;
private UdpClient subscriber;
private bool bShutDown = true;
private Thread thReceive; /// <summary>
/// 数据到达事件
/// </summary>
public event OnReceiveEventHandler OnReceive;

/// <summary>
/// 构造
/// </summary>
/// <param name="multiCastIP">组播IP</param>
/// <param name="udpPort">端口</param>
public MultiCast(string multiCastIP,int udpPort)
{
addr = multiCastIP;
port = udpPort;
OnReceive += new OnReceiveEventHandler(MultiCast_OnReceive);
} /// <summary>
/// 启动监听
/// </summary>
public void Startup()
{  
if (!bShutDown)
return; subscriber = new UdpClient(port); 
IPAddress ipMultiCast = IPAddress.Parse(addr);

try
{
subscriber.JoinMulticastGroup(ipMultiCast);
}
catch(Exception ex)
{
System.Windows.Forms.MessageBox.Show("无法加入到多播组[" + addr + "]\n\n" + ex.ToString());
return;
} //抛出监听线程
bShutDown = false;
thReceive = new Thread(new ThreadStart(Receive));
            thReceive.Start();   
} /// <summary>
/// 关闭监听
/// </summary>
public void ShutDown()
{
bShutDown = true;
thReceive.Join(500); try
{
thReceive.Abort();
}
catch
{

} subscriber.Close();
subscriber = null;
} private void MultiCast_OnReceive(string xmlPack)
{
//do nothing
}
private void Receive()
{
byte[] bytes = null;
IPEndPoint ipFrom = null;
string xml = ""; while(!bShutDown)
{
bytes = subscriber.Receive(ref ipFrom);

if (bytes != null)
{
if (bytes.Length > 0)
{
xml = System.Text.ASCIIEncoding.ASCII.GetString(bytes);
//激发事件
OnReceive(xml);
}
                }               
}
}
}
}

Answer 2

cooldingding 
 weisunding(鼎鼎)不是倒分？