首先是发送端：

/// <summary> /// 发送UDP消息 /// </summary> /// <param>消息内容</param> void Send(string msg) { UdpClient udpClient = new UdpClient(); IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Broadcast, 10249); byte[] buffer = Encoding.UTF8.GetBytes(msg); udpClient.Send(buffer, buffer.Length, ipEndPoint); }

然后是接收端：

static void Main() { UdpClient udpServer = new UdpClient(10249); IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, 10249); udpServer.BeginReceive(Received, udpServer); }

/// <summary>
/// 异步接收UDP数据
/// </summary>
/// <param></param>
void Received(IAsyncResult iar)
{
　　udpServer = iar.AsyncState as UdpClient;
　　byte[] buffer = udpServer.EndReceive(iar, ref ipEndPoint);

　　//将获取的byte[]数据转换成字符串
　　string m = Encoding.UTF8.GetString(buffer).Trim();

　　Console.WriteLine("Receive:{0}",m);

　　//继续异步接收数据
　　udpServer.BeginReceive(Received, udpServer);
}

接收端采用了异步执行的方式，当然也可以用Thread来做！