简单的C# Socket编程

using System;
2using System.Net;
3using System.Net.Sockets;
4using System.IO ;
5
6public class Echoserver
7{
8    //entry point of main method.
9    public static void Main()
10    {
11        //TcpListener is listening on the given port
12        Int32 port = 1234;
13
14        //IPAddress is connetct ip address
15        //IPAddress addr = IPAddress.Parse("127.0.0.1");
16        IPAddress ipAddress = Dns.Resolve("localhost").AddressList[0];
17
18        TcpListener tcpListener = new TcpListener(ipAddress,port);
19        tcpListener.Start();
20        Console.WriteLine("Server Started") ;
21        //Accepts a new connection
22        Socket socketForClient = tcpListener.AcceptSocket();
23        //StreamWriter and StreamReader Classes for reading and writing the data to and from.
24        //The server reads the meassage sent by the Client ,converts it to upper case and sends it back to the client.
25        //Lastly close all the streams.
26        try
27        {
28            if (socketForClient.Connected)
29            {
30                while(true)
31                {
32                    Console.WriteLine("Client connected");
33                    NetworkStream networkStream = new NetworkStream(socketForClient);
34                    StreamWriter streamWriter = new StreamWriter(networkStream);
35                    StreamReader streamReader = new StreamReader(networkStream);
36                    string line = streamReader.ReadLine();
37                    Console.WriteLine("Read:" +line);
38                    line=line.ToUpper()+ "!";
39                    streamWriter.WriteLine(line);
40                    Console.WriteLine("Wrote:"+line);
41                    streamWriter.Flush() ;
42                }
43            }
44            socketForClient.Close();
45            Console.WriteLine("Exiting");
46        }
47        catch(Exception e)
48        {
49            Console.WriteLine(e.ToString()) ;
50        }
51    }
52}

using System;
2using System.Text;
3using System.Drawing;
4using System.Collections;
5using System.ComponentModel;
6using System.Windows.Forms;
7using System.Net;
8using System.Net.Sockets;
9using System.IO;
10
11namespace SocketSample
12{
13    public class Sample : System.Windows.Forms.Form
14    {
15        private System.Windows.Forms.Button btS;
16        private System.Windows.Forms.TextBox t1;
17        private NetworkStream networkStream ;
18        private StreamReader streamReader ;
19        private StreamWriter streamWriter ;
20        ArrayList sb;
21        TcpClient myclient;
22        bool flag=false;
23        private System.Windows.Forms.ListBox t2;
24
25        private System.ComponentModel.Container components = null;
26
27        public Sample()
28        {
29            sb = new ArrayList();
30            InitializeComponent();
31            if(!flag)
32                Connect();
33
34            //get a Network stream from the server
35            networkStream = myclient.GetStream();
36            streamReader = new StreamReader(networkStream);
37            streamWriter = new StreamWriter(networkStream);
38            ShowMessage();
39        }
40
41        protected override void Dispose( bool disposing )
42        {
43            if( disposing )
44            {
45                if(components != null)
46                {
47                    components.Dispose();
48                }
49            }
50            base.Dispose( disposing );
51        }
52
53        #region Windows 窗体设计器生成的代码
54        /// <summary>
55        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
56        /// 此方法的内容。
57        /// </summary>
58        private void InitializeComponent()
59        {
60            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Sample));
61            this.t1 = new System.Windows.Forms.TextBox();
62            this.btS = new System.Windows.Forms.Button();
63            this.t2 = new System.Windows.Forms.ListBox();
64            this.SuspendLayout();
65            //
66            // t1
67            //
68            this.t1.Location = new System.Drawing.Point(24, 32);
69            this.t1.Name = "t1";
70            this.t1.Size = new System.Drawing.Size(280, 21);
71            this.t1.TabIndex = 0;
72            this.t1.Text = "";
73            this.t1.TextChanged += new System.EventHandler(this.t1_TextChanged);
74            //
75            // btS
76            //
77            this.btS.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("btS.BackgroundImage")));
78            this.btS.Enabled = false;
79            this.btS.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
80            this.btS.Location = new System.Drawing.Point(320, 32);
81            this.btS.Name = "btS";
82            this.btS.TabIndex = 1;
83            this.btS.Text = "Send";
84            this.btS.Click += new System.EventHandler(this.btS_Click);
85            //
86            // t2
87            //
88            this.t2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
89            this.t2.Font = new System.Drawing.Font("Courier New", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
90            this.t2.ItemHeight = 15;
91            this.t2.Location = new System.Drawing.Point(24, 64);
92            this.t2.Name = "t2";
93            this.t2.Size = new System.Drawing.Size(368, 212);
94            this.t2.TabIndex = 2;
95            //
96            // Sample
97            //
98            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
99            this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
100            this.ClientSize = new System.Drawing.Size(416, 297);
101            this.Controls.Add(this.t2);
102            this.Controls.Add(this.btS);
103            this.Controls.Add(this.t1);
104            this.Name = "Sample";
105            this.Text = "Sample";
106            this.ResumeLayout(false);
107
108        }
109        #endregion
110
111        public static void Main()
112        {
113            Sample df=new Sample();
114            df.FormBorderStyle=FormBorderStyle.Fixed3D;
115            Application.Run(df);
116        }
117
118        protected void Connect()
119        {
120            //connect to the "localhost" at the give port
121            //if you have some other server name then you can use that instead of "localhost"
122
123            try
124            {
125                sb.Add("Conneting to Server");
126                myclient = new TcpClient("localhost", 1234);
127                sb.Add("Conneted,Please enter something in the textbox");
128            }
129            catch
130            {
131                sb.Add(string.Format("Failed to connect to server at {0}:1234", "localhost"));
132            }
133            flag = true;
134        }
135
136        protected void ShowMessage()
137        {
138            for(int i=0;i<sb.Count;i++)
139            {
140                t2.Items.Add((object)sb[i].ToString());
141            }
142            sb.Clear();
143        }
144
145        private void t1_TextChanged(object sender, System.EventArgs e)
146        {
147            if(t1.Text == "" )
148                btS.Enabled = false;
149            else
150                btS.Enabled=true;
151        }
152
153        private void btS_Click(object sender, System.EventArgs e)
154        {
155            if(t1.Text=="")
156            {
157                sb.Add( "Please enter something in the textbox.");
158                t1.Focus();
159                return ;
160            }
161            string s;
162            try
163            {
164                streamWriter.WriteLine(t1.Text);
165                Console.WriteLine("Sending Message");
166                streamWriter.Flush();
167                s= streamReader.ReadLine();
168                Console.WriteLine("Reading Message") ;
169                Console.WriteLine(s) ;
170                sb.Add(s);
171                t1.Text = "";
172                t1.Focus();
173                ShowMessage();
174            }
175            catch
176            {
177                MessageBox.Show("Error.");
178            }
179        }
180    }
181}