C#最基本的Socket编程

示例程序是同步套接字程序，功能很简单，只是客户端发给服务器一条信息，服务器向客户端返回一条信息，是一个简单示例，也是一个最基本的socket编程流程。

简单步骤说明：

1.用指定的port, ip 建立一个EndPoint对象

2.建立一个Socket对象；

3.用Socket对象的Bind()方法绑定EndPoint

4.用Socket对象的Listen()方法开始监听

5.接收到客户端的连接，用socket对象的Access()方法创建新的socket对象用于和请求的客户端进行通信

6.通信结束后记得关闭socket

代码：

  int port = ;
             string host = "127.0.0.1";
             // create endPoint
             IPAddress ip = IPAddress.Parse(host);
             IPEndPoint ipe = new IPEndPoint(ip, port);
             Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
             s.Bind(ipe);

             s.Listen();

             Console.WriteLine("wait a client to connect..");
             Socket temp = s.Accept();
             Console.WriteLine("create a connection");

             //receive message
             string recvStr = "";
             byte[] recvBytes= new byte[];
             int bytes;
             bytes = temp.Receive(recvBytes, recvBytes.Length, );
             recvStr += Encoding.ASCII.GetString(recvBytes, , bytes);
             Console.WriteLine("server have get message:{0}",recvStr );

             // send message
             string sendStr = "ok! client send message cuccessful";
             byte[] bs = Encoding.ASCII.GetBytes(sendStr);
             temp.Send(bs, bs.Length, );

             //end
             temp.Close();
             s.Close();

             Console.WriteLine("end socket com!");
             Console.ReadLine();

客户端：

1.用指定的port, ip 建立一个EndPoint对象

2.建立一个socket对象

3.用socket对象的Connect()方法以上面的EndPoint对象作为参数，向服务器发送连接请求；

4.如果连接成功，就用socket对象的Send()方法向服务器发送信息

5.用socket对象的Receive()方法接收服务器发来的信息

6.通信结束记得关闭socket：

代码：：

//init server port and ip
                int port = ;
                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, );

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

                recvStr += Encoding.ASCII.GetString(recvBytes, , 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();

来源：内容来自网络