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 = 2000;
            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(0);

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

            //receive message
            string recvStr = "";
            byte[] recvBytes= new byte[1024];
            int bytes;
            bytes = temp.Receive(recvBytes, recvBytes.Length, 0);
            recvStr += Encoding.ASCII.GetString(recvBytes, 0, 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, 0);

            //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 = 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();

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