以下是C＃中的示例 ：

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/* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765 */ using System; using System.Net; using System.Net.Sockets; using System.Text; public class UdpSrvrSample { public static void Main() { byte[] data = new byte[1024]; IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050); UdpClient newsock = new UdpClient(ipep); Console.WriteLine("Waiting for a client..."); IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0); data = newsock.Receive(ref sender); Console.WriteLine("Message received from {0}:", sender.ToString()); Console.WriteLine(Encoding.ASCII.GetString(data, 0, data.Length)); string welcome = "Welcome to my test server"; data = Encoding.ASCII.GetBytes(welcome); newsock.Send(data, data.Length, sender); while(true) { data = newsock.Receive(ref sender); Console.WriteLine(Encoding.ASCII.GetString(data, 0, data.Length)); newsock.Send(data, data.Length, sender); } } }