C#最基本的Socket編程

示常式序是同步套接字程式，功能很簡單，只是客戶端發給伺服器一條信息，伺服器向客戶端返回一條信息，是一個簡單示例，也是一個最基本的socket編程流程。

簡單步驟說明：

1.用指定的port, ip 建立一個EndPoint對象

2.建立一個Socket對象；

3.用Socket對象的Bind()方法綁定EndPoint

4.用Socket對象的Listen()方法開始監聽

5.接收到客戶端的連接，用socket對象的Access()方法創建新的socket對象用於和請求的客戶端進行通信

6.通信結束後記得關閉socket

代碼：

 1  int port = 2000;
 2             string host = "127.0.0.1";
 3             // create endPoint 
 4             IPAddress ip = IPAddress.Parse(host);
 5             IPEndPoint ipe = new IPEndPoint(ip, port);
 6             Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 7             s.Bind(ipe);
 8 
 9             s.Listen(0);
10 
11             Console.WriteLine("wait a client to connect..");
12             Socket temp = s.Accept();
13             Console.WriteLine("create a connection");
14 
15             //receive message
16             string recvStr = "";
17             byte[] recvBytes= new byte[1024];
18             int bytes;
19             bytes = temp.Receive(recvBytes, recvBytes.Length, 0);
20             recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
21             Console.WriteLine("server have get message:{0}",recvStr );
22 
23             // send message
24             string sendStr = "ok! client send message cuccessful";
25             byte[] bs = Encoding.ASCII.GetBytes(sendStr);
26             temp.Send(bs, bs.Length, 0);
27 
28             //end
29             temp.Close();
30             s.Close();
31         
32             Console.WriteLine("end socket com!");
33             Console.ReadLine();

 客戶端：

1.用指定的port, ip 建立一個EndPoint對象

2.建立一個socket對象

3.用socket對象的Connect()方法以上面的EndPoint對象作為參數，向伺服器發送連接請求；

4.如果連接成功，就用socket對象的Send()方法向伺服器發送信息

5.用socket對象的Receive()方法接收伺服器發來的信息

6.通信結束記得關閉socket：

代碼：：

//init server port and ip
                int port = 2000;
                string host = "127.0.0.1";
                IPAddress ip = IPAddress.Parse(host);

                // create ipendpoint
                IPEndPoint ipe = new IPEndPoint(ip, port);

                // create client sockets
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                Console.WriteLine("Connecting...");
                
                // connect to server
                c.Connect(ipe);
                
                // send to server
                string sendStr = "Hello, this is a socket test";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);
                Console.WriteLine("Send Message");
                c.Send(bs, bs.Length, 0);

                // receive a message from server
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = c.Receive(recvBytes, recvBytes.Length, 0);

                recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
                Console.WriteLine("Client get message:{0}", recvStr);

                //close Client
                c.Close();

            }
            catch (ArgumentException e)
            {

                Console.WriteLine("argumentNullException:{0}",e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("socketException:{0}",e);
            }
            Console.WriteLine("Press enter to exit");
            Console.ReadLine();

來源：內容來自網路