C#中使用UDP通信的示例

static void Main(string[] args)
{
  UdpClient client = null;
  string receiveString = null;
  byte[] receiveData = null;
  //实例化一个远程端点，IP和端口可以随意指定，等调用client.Receive(ref remotePoint)时会将该端点改成真正发送端端点
  IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0);
  
  while (true)
  {
 client = new UdpClient(11000);
 receiveData = client.Receive(ref remotePoint);//接收数据
 receiveString = Encoding.Default.GetString(receiveData);
 Console.WriteLine(receiveString);
 client.Close();//关闭连接
  }
}
客户端代码如下：
 
static void Main(string[] args)
{
  string sendString = null;//要发送的字符串
  byte[] sendData = null;//要发送的字节数组
  UdpClient client = null;
  
  IPAddress remoteIP = IPAddress.Parse("127.0.0.1");
  int remotePort = 11000;
  IPEndPoint remotePoint = new IPEndPoint(remoteIP, remotePort);//实例化一个远程端点
  
  while (true)
  {
 sendString = Console.ReadLine();
 sendData = Encoding.Default.GetBytes(sendString);
  
 client = new UdpClient();
 client.Send(sendData, sendData.Length, remotePoint);//将数据发送到远程端点
 client.Close();//关闭连接
  }