程序分别为服务端与客户端，服务端创建套接字使用多线程侦听多客户端请求
代码需要引用System.Net；和System.Net.Socket；这两个类
分享源码demo：https://pan.baidu.com/s/10RuE9Vk0cIoxY91uzx4Gig 提取码:4eds
运行图：
服务端
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace ConsoleServer
7 {
8 class Program
9 {
10 static void Main(string[] args)
11 {
12 ServerControl Server = new ServerControl();//初始化Socket
13 Server.Start();//启动侦听连接
14 //Console.WriteLine("123");
15 Console.Read();
16 }
17 }
18 } 1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Net.Sockets;
6 using System.Net;
7 using System.Threading;
8
9 namespace ConsoleServer
10 {
11 public class ServerControl
12 {
13 public Socket ServerSocket;
14 public List<Socket> ClientList=null;//客户端集合
15
16 /// <summary>
17 /// 构造函数
18 /// </summary>
19 public ServerControl()
20 {
21 //创建套接字，ipv4寻址方式，套接字类型，传输协议
22 ServerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
23 ClientList=new List<Socket>();//实例化客户端接入集合介入
24 }
25
26 public void Start()
27 {
28 ServerSocket.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"),1231));//绑定IP和端口
29 ServerSocket.Listen(10000);//支持最多连接数
30 Console.WriteLine("start server succeed");
31
32 //当有客户接入时当前线程会被挂起，每次新接入客户端创建独立线处理
33 Thread ThreadAccept = new Thread(Accept);
34 ThreadAccept.IsBackground = true;//设置为后台线程
35 ThreadAccept.Start();//启动线程
36
37 }
38
39 private void Accept()
40 {
41 Socket Client = ServerSocket.Accept();//客户端接入当前线程挂起
42 IPEndPoint point=Client.RemoteEndPoint as IPEndPoint;//将远端节点转为ip和端口
43 Console.WriteLine("IP {0}:{1} connect succeed",point.Address,point.Port);//显示接入信息
44 ClientList.Add(Client);//将此连接添加到客户集合
45
46 //接收消息只处理一次，线程被挂起，创建新线程处理其新消息
47 Thread ThreadReceive = new Thread(Receive);
48 ThreadReceive.IsBackground = true;//设置为后台线程
49 ThreadReceive.Start(Client);//启动线程
50 Accept();//回掉处理新接入客户端
51 }
52
53 /// <summary>
54 /// 处理收到的消息
55 /// </summary>
56 /// <param name="obj"></param>
57 private void Receive(object obj)
58 {
59 Socket Client = obj as Socket;
60 IPEndPoint point = Client.RemoteEndPoint as IPEndPoint;//将远端节点转为ip和端口
61 try
62 {
63 byte[] ByteReceive = new byte[1024];//消息数组
64 int ReceiveLenght = Client.Receive(ByteReceive);//只处理一次消息，此处会被挂起
65 string msg = point.Address + "[" + point.Port + "]:" + Encoding.UTF8.GetString(ByteReceive, 0, ReceiveLenght);
66 Console.WriteLine(msg);//打印收到的消息
67 Broadcast(Client, msg);//广播消息
68
69 Client.Send(Encoding.UTF8.GetBytes(DateTime.Now.ToString()));//回发当前时间给消息源
70 Receive(Client);//回调处理新消息
71 }
72 catch
73 {
74 ClientList.Remove(Client);//当客户端断开，从客户端集合移除该客户端
75 Console.WriteLine("{0}[{1}]:断开连接", point.Address, point);//打印提示信息
76 }
77
78 }
79
80 /// <summary>
81 /// 广播消息
82 /// </summary>
83 /// <param name="cli"></param>
84 /// <param name="msg"></param>
85 public void Broadcast(Socket cli,string msg)
86 {
87 foreach (var item in ClientList )//遍历所有客户端
88 {
89 if (item != cli)
90 item.Send(Encoding.UTF8.GetBytes(msg));//给除数据源以外客户端发送广播消息
91 }
92 }
93 }
94 }客户端
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace ConsoleClient
7 {
8 class Program
9 {
10 static void Main(string[] args)
11 {
12 ClientControl Client = new ClientControl();//初始化Socket
13 Client.Connect("127.0.0.1",1231);//连接到服务器
14 Console.WriteLine("Please enter the content to send,Enter exit to exit!");//提示信息
15 string msg=Console.ReadLine();//输入
16 while (msg!="exit")//判断是否退出
17 {
18 Client.Send(msg);//发送消息
19 msg = Console.ReadLine();//输入消息
20
21 }
22
23 }
24 }
25 } 1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Net.Sockets;
6 using System.Threading;
7
8 namespace ConsoleClient
9 {
10 public class ClientControl
11 {
12 private Socket ClientSocket;
13
14 public ClientControl()
15 {
16 //创建套接字，ipv4寻址方式，套接字类型，传输协议
17 ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
18 }
19
20 /// <summary>
21 /// 连接到服务器
22 /// </summary>
23 /// <param name="IP"></param>
24 /// <param name="Port"></param>
25 public void Connect(string IP, Int32 Port)
26 {
27 try
28 {
29 ClientSocket.Connect(IP, Port);//连接到指定服务器
30 Console.WriteLine("connect server succeed ok!");//提示信息
31 //收到消息是线程会被挂起，创建新线程处理收到的消息
32 Thread ThreadReceive = new Thread(Receive);
33 ThreadReceive.IsBackground = true;
34 ThreadReceive.Start();
35 }
36 catch(SocketException e)
37 {
38 Console.WriteLine("无法连接到{0}:{1}{2}",IP,Port,e);
39 }
40 }
41
42 /// <summary>
43 /// 发送消息
44 /// </summary>
45 /// <param name="msg"></param>
46 public void Send(string msg)
47 {
48 ClientSocket.Send(Encoding.UTF8.GetBytes(msg));
49 }
50
51 /// <summary>
52 /// 接收消息
53 /// </summary>
54 private void Receive()
55 {
56 try
57 {
58 byte[] ByteReceive = new byte[1024];
59 int ReceiveLenght = ClientSocket.Receive(ByteReceive);//此处线程会被挂起
60 Console.WriteLine("{0}", Encoding.UTF8.GetString(ByteReceive, 0, ReceiveLenght));
61 Receive();
62 }
63 catch
64 {
65 Console.WriteLine("服务器已断开");
66 }
67 }
68 }
69 }
来源：oschina
链接：https://my.oschina.net/u/4267707/blog/4281401