示例C#利用UdpClient发送广播消息<转>
在此只做收藏被查，原文请访问：http://www.cnblogs.com/cgzwwy/archive/2009/12/10/1621389.html
首先写个接受消息的客户端。这里偷了点懒，new UdpClient(11000)就是用Udp方式侦听11000端口，侦听任何发送到11000端口的消息都会接收到。
代码
UdpClient udpClient = new UdpClient(11000);
try
{
IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
string returnData = Encoding.ASCII.GetString(receiveBytes);
Console.WriteLine("This is the message you received " +
returnData.ToString());
Console.WriteLine("This message was sent from " +
RemoteIpEndPoint.Address.ToString() +
" on their port number " +
RemoteIpEndPoint.Port.ToString());
udpClient.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
然后写个发Udp的服务器
代码
UdpClient udpClient = new UdpClient(11001);
try
{
udpClient.Connect(IPAddress.Parse("192.168.0.255"), 11000);
Byte[] sendBytes = Encoding.ASCII.GetBytes("Is anybody thereA?");
udpClient.Send(sendBytes, sendBytes.Length);
udpClient.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
其中192.168.0.255是你的内网广播地址，11000是客户端的端口。
广播地址是通过你的子网掩码获得的例如你的网关是192.168.0.1，掩码是255.255.255.0，那么你的广播地址就是192.168.0.255.