UDP通信是無連接通信，客戶端在發(fā)送數(shù)據(jù)前無需與服務(wù)器端建立連接，即使服務(wù)器端不在線也可以發(fā)送，但是不能保證服務(wù)器端可以收到數(shù)據(jù)。

服務(wù)器端代碼：

1. staticvoidMain(string[]args)
2. {
3. UdpClientclient=null;
4. stringreceiveString=null;
5. byte[]receiveData=null;
6. //實(shí)例化一個(gè)遠(yuǎn)程端點(diǎn)，ip和端口可以隨意指定，等調(diào)用client.Receive(refremotePoint)時(shí)會(huì)將該端點(diǎn)改成真正發(fā)送端端點(diǎn)
7. IPEndPointremotePoint=newIPEndPoint(IPAddress.Any,0);
9. while(true)
10. {
11. client=newUdpClient(11000);
12. receiveData=client.Receive(refremotePoint);//接收數(shù)據(jù)
13. receiveString=Encoding.Default.GetString(receiveData);
14. Console.WriteLine(receiveString);
15. client.Close();//關(guān)閉連接
16. }
17. }

客戶端代碼：

1. staticvoidMain(string[]args)
2. {
3. stringsendString=null;//要發(fā)送的字符串
4. byte[]sendData=null;//要發(fā)送的字節(jié)數(shù)組
5. UdpClientclient=null;
7. IPAddressremoteIP=IPAddress.Parse("127.0.0.1");
8. intremotePort=11000;
9. IPEndPointremotePoint=newIPEndPoint(remoteIP,remotePort);//實(shí)例化一個(gè)遠(yuǎn)程端點(diǎn)
11. while(true)
12. {
13. sendString=Console.ReadLine();
14. sendData=Encoding.Default.GetBytes(sendString);
16. client=newUdpClient();
17. client.Send(sendData,sendData.Length,remotePoint);//將數(shù)據(jù)發(fā)送到遠(yuǎn)程端點(diǎn)
18. client.Close();//關(guān)閉連接
19. }
20. }