首先创建一个服务端程序，这个程序就用VS的控制台程序做即可了。

代码例如以下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;namespace SocketServer
{class Program{const int Port = 20000; //设置连接portstatic void Main(string[] args){// 初始化serverIPSystem.Net.IPAddress SocketIP = System.Net.IPAddress.Parse("127.0.0.1");// 创建TCP侦听器TcpListener listener = new TcpListener(SocketIP, Port);listener.Start();// 显示server启动信息Console.WriteLine("服务开启中...\n");// 循环接受客户端的连接请求while (true){ChatClient client = new ChatClient(listener.AcceptTcpClient());// 显示连接客户端的IP与portConsole.WriteLine(client._clientIP + " 添�...\n");}}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Net.Sockets;namespace SocketServer
{class ChatClient{public static Hashtable ALLClients = new Hashtable(); // 客户列表private TcpClient _client;  // 客户端实体public string _clientIP;   // 客户端IPprivate string _clientNick; // 客户端昵称private byte[] data;        // 消息数据private bool ReceiveNick = true;public ChatClient(TcpClient client){this._client = client;this._clientIP = client.Client.RemoteEndPoint.ToString();// 把当前客户端实例加入�到客户列表其中ALLClients.Add(this._clientIP, this);data = new byte[this._client.ReceiveBufferSize];// 从服务端获取消息client.GetStream().BeginRead(data, 0, System.Convert.ToInt32(this._client.ReceiveBufferSize), ReceiveMessage, null);}// 从客戶端获取消息public void ReceiveMessage(IAsyncResult ar){int bytesRead;try{lock (this._client.GetStream()){bytesRead = this._client.GetStream().EndRead(ar);}if (bytesRead < 1){ALLClients.Remove(this._clientIP);Broadcast(this._clientNick + "离开聊天室");return;}else{string messageReceived = System.Text.Encoding.ASCII.GetString(data, 0, bytesRead);if (ReceiveNick){this._clientNick = messageReceived;Broadcast(this._clientNick + "加入聊天室");ReceiveNick = false;}else{Broadcast(this._clientNick + "：" + messageReceived);}}lock (this._client.GetStream()){this._client.GetStream().BeginRead(data, 0, System.Convert.ToInt32(this._client.ReceiveBufferSize), ReceiveMessage, null);}}catch (Exception ex){ALLClients.Remove(this._clientIP);Broadcast(this._clientNick + "离开聊天室");}}// 向客戶端发送消息public void sendMessage(string message){try{System.Net.Sockets.NetworkStream ns;lock (this._client.GetStream()){ns = this._client.GetStream();}// 对信息进行编码byte[] bytesToSend = System.Text.Encoding.ASCII.GetBytes(message);ns.Write(bytesToSend, 0, bytesToSend.Length);ns.Flush();}catch (Exception ex){}}// 向客户端广播消息public void Broadcast(string message){Console.WriteLine(message);foreach (DictionaryEntry c in ALLClients){((ChatClient)(c.Value)).sendMessage(message + Environment.NewLine);}}}
}

这个比較简单啊，我就直接拷贝了别人的代码，比較好理解，适合新手~~~(如有侵犯版权，请私信联系我)

接下来就是Unity这边的代码了~

代码例如以下：

using UnityEngine;
using System.Collections;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Net.Sockets;public class ScoketClient : MonoBehaviour
{const int Port = 20000;//port号与服务端port相应private TcpClient client;byte[] data;public string UserName = "";//usernamepublic string message = "";//聊天内容public string sendMsg = "";//输入框void OnGUI(){UserName = GUI.TextField(new Rect(10, 10, 100, 20), UserName);message = GUI.TextArea(new Rect(10, 40, 300, 200), message);sendMsg = GUI.TextField(new Rect(10, 250, 210, 20), sendMsg);if (GUI.Button(new Rect(120, 10, 80, 20), "连接server")){this.client = new TcpClient();this.client.Connect("127.0.0.1", Port);data = new byte[this.client.ReceiveBufferSize];SendSocket(UserName);this.client.GetStream().BeginRead(data, 0, System.Convert.ToInt32(this.client.ReceiveBufferSize), ReceiveMessage, null);};if (GUI.Button(new Rect(230, 250, 80, 20), "发送")){SendSocket(sendMsg);sendMsg = "";};}public void SendSocket(string message){try{NetworkStream ns = this.client.GetStream();byte[] data = System.Text.Encoding.ASCII.GetBytes(message);ns.Write(data, 0, data.Length);ns.Flush();}catch (Exception ex){}}public void ReceiveMessage(IAsyncResult ar){try{int bytesRead;bytesRead = this.client.GetStream().EndRead(ar);if (bytesRead < 1){return;}else{message += System.Text.Encoding.ASCII.GetString(data, 0, bytesRead);}this.client.GetStream().BeginRead(data, 0, System.Convert.ToInt32(this.client.ReceiveBufferSize), ReceiveMessage, null);}catch (Exception ex){}}
}

这样就能够了~先开启服务端，然后在用client连接。

这里用的编码是ASCII。假设想用中文的话改成UTF-8，或者GB2312。