简单的C#Socket编程

简单的C#Socket编程
2009年06月23日
　　using System;
　　using System.Net;
　　using System.Net.Sockets;
　　using System.IO ;
　　public class Echoserver
　　{
　　//entry point of main method.
　　public static void Main()
　　{
　　//TcpListener is listening on the given port
　　Int32 port = 1234;
　　//IPAddress is connetct ip address
　　//IPAddress addr = IPAddress.Parse("127.0.0.1");
　　IPAddress ipAddress = Dns.Resolve("localhost").AddressList[0];
　　TcpListener tcpListener = new TcpListener(ipAddress,port);
　　tcpListener.Start();     
　　Console.WriteLine("Server Started") ;           
　　//Accepts a new connection
　　Socket socketForClient = tcpListener.AcceptSocket();           
　　//StreamWriter and StreamReader Classes for reading and writing the data to and from.
　　//The server reads the meassage sent by the Client ,converts it to upper case and sends it back to the client.
　　//Lastly close all the streams.
　　try
　　{
　　if (socketForClient.Connected)
　　{
　　while(true)
　　{
　　Console.WriteLine("Client connected");
　　NetworkStream networkStream = new NetworkStream(socketForClient);
　　StreamWriter streamWriter = new StreamWriter(networkStream);
　　StreamReader streamReader = new StreamReader(networkStream);
　　string line = streamReader.ReadLine();
　　Console.WriteLine("Read:" +line);
　　line=line.ToUpper()+ "!";
　　streamWriter.WriteLine(line);
　　Console.WriteLine("Wrote:"+line);
　　streamWriter.Flush() ;                     
　　}
　　}
　　socketForClient.Close();           
　　Console.WriteLine("Exiting");
　　}
　　catch(Exception e)
　　{
　　Console.WriteLine(e.ToString()) ;
　　}
　　}
　　}
　　Client,客户端程序，在文本框中输入字符，将在列表框显示。
　　using System;
　　using System.Text;
　　using System.Drawing;
　　using System.Collections;
　　using System.ComponentModel;
　　using System.Windows.Forms;
　　using System.Net;
　　using System.Net.Sockets;
　　using System.IO;
　　namespace SocketSample
　　{
　　public class Sample : System.Windows.Forms.Form
　　{
　　private System.Windows.Forms.Button btS;
　　private System.Windows.Forms.TextBox t1;
　　private NetworkStream networkStream ;
　　private StreamReader streamReader ;
　　private StreamWriter streamWriter ;
　　ArrayList sb;
　　TcpClient myclient;
　　bool flag=false;
　　private System.Windows.Forms.ListBox t2;
　　private System.ComponentModel.Container components = null;
　　public Sample()
　　{
　　sb = new ArrayList();
　　InitializeComponent();
　　if(!flag)
　　Connect();
　　//get a Network stream from the server
　　networkStream = myclient.GetStream();
　　streamReader = new StreamReader(networkStream);
　　streamWriter = new StreamWriter(networkStream);
　　ShowMessage();
　　}
　　protected override void Dispose( bool disposing )
　　{
　　if( disposing )
　　{
　　if(components != null)
　　{
　　components.Dispose();
　　}
　　}
　　base.Dispose( disposing );
　　}
　　Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码
　　/**////
　　/// 设计器支持所需的方法 - 不要使用代码编辑器修改
　　/// 此方法的内容。
　　///
　　private void InitializeComponent()
　　{
　　System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Sample));
　　this.t1 = new System.Windows.Forms.TextBox();
　　this.btS = new System.Windows.Forms.Button();
　　this.t2 = new System.Windows.Forms.ListBox();
　　this.SuspendLayout();
　　//
　　// t1
　　//
　　this.t1.Location = new System.Drawing.Point(24, 32);
　　this.t1.Name = "t1";
　　this.t1.Size = new System.Drawing.Size(280, 21);
　　this.t1.TabIndex = 0;
　　this.t1.Text = "";
　　this.t1.TextChanged += new System.EventHandler(this.t1_TextChanged);
　　//
　　// btS
　　//
　　this.btS.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("btS.BackgroundImage")));
　　this.btS.Enabled = false;
　　this.btS.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
　　this.btS.Location = new System.Drawing.Point(320, 32);
　　this.btS.Name = "btS";
　　this.btS.TabIndex = 1;
　　this.btS.Text = "Send";
　　this.btS.Click += new System.EventHandler(this.btS_Click);
　　//
　　// t2
　　//
　　this.t2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
　　this.t2.Font = new System.Drawing.Font("Courier New", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
　　this.t2.ItemHeight = 15;
　　this.t2.Location = new System.Drawing.Point(24, 64);
　　this.t2.Name = "t2";
　　this.t2.Size = new System.Drawing.Size(368, 212);
　　this.t2.TabIndex = 2;
　　//
　　// Sample
　　//
　　this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
　　this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
　　this.ClientSize = new System.Drawing.Size(416, 297);
　　this.Controls.Add(this.t2);
　　this.Controls.Add(this.btS);
　　this.Controls.Add(this.t1);
　　this.Name = "Sample";
　　this.Text = "Sample";
　　this.ResumeLayout(false);
　　}
　　#endregion
　　public static void Main()
　　{
　　Sample df=new Sample();
　　df.FormBorderStyle=FormBorderStyle.Fixed3D;
　　Application.Run(df);
　　}
　　protected void Connect()
　　{           
　　//connect to the "localhost" at the give port
　　//if you have some other server name then you can use that instead of "localhost"
　　try
　　{
　　sb.Add("Conneting to Server");
　　myclient = new TcpClient("localhost", 1234);
　　sb.Add("Conneted,Please enter something in the textbox");
　　}
　　catch
　　{
　　sb.Add(string.Format("Failed to connect to server at {0}:1234", "localhost"));
　　}
　　flag = true;
　　}
　　protected void ShowMessage()
　　{
　　for(int i=0;i<sb.Count;i++)
　　{
　　t2.Items.Add((object)sb.ToString());
　　}
　　sb.Clear();
　　}
　　private void t1_TextChanged(object sender, System.EventArgs e)
　　{
　　if(t1.Text == "" )
　　btS.Enabled = false;
　　else
　　btS.Enabled=true;
　　}
　　private void btS_Click(object sender, System.EventArgs e)
　　{
　　if(t1.Text=="")
　　{
　　sb.Add( "Please enter something in the textbox.");
　　t1.Focus();
　　return ;
　　}
　　string s;
　　try
　　{           
　　streamWriter.WriteLine(t1.Text);
　　Console.WriteLine("Sending Message");
　　streamWriter.Flush();
　　s= streamReader.ReadLine();
　　Console.WriteLine("Reading Message") ;
　　Console.WriteLine(s) ;
　　sb.Add(s);
　　t1.Text = "";
　　t1.Focus();
　　ShowMessage();
　　}
　　catch
　　{
　　MessageBox.Show("Error.");
　　}   
　　}
　　}
　　}