# 观前提醒

项目会在 GitHub 中开源，链接：https://github.com/Maikire/UnityGameDemo/tree/main/A simple web chat room

如果有什么问题或想法，欢迎各位在评论区留言。

# 网络聊天室

本章将制作一个基于 UDP 的网络聊天室，客户端与服务端都用 Unity 来实现（实际的开发中，服务端一定不是用 Unity 做的）

需求：

用户可以自由选择登录服务端或客户端。
客户端：输入名字、服务端的 IP 和端口后即可进行多人聊天。
服务端：输入服务端的 IP 和端口后即可开启服务，无法进行聊天，可以看到谁在线，以及他们的 IP 和端口

# 需求分析

使用 ClientSever 架构
向服务端发送数据时，不能发送自定义的类，只能发送基本的数据类型，例如：bool/int/float/string...
自定义协议：按照指定的格式发送数据和读取数据

具体内容

发送的消息可能有很多种，使用枚举区分
将消息的内容封装到一个类中，自定义协议，提供字节数组与对象之间的转换的功能
制作客户端网络服务类，实现接收和发送消息的功能，将网络部分与其他部分隔离
实现登录功能，通知服务端上线
制作客户端的脚本，实现基本的功能
制作服务端网络服务类，与客户端网络服务类相同
制作服务端的脚本，实现基本的功能
仅有三个类是最重要的：消息内容、客户端网络服务类、服务端网络服务类。其他的类都不是重点。

# 代码部分

# 消息类型

代码如下：

MessageType

	namespace ChatDemo
	{
	/// <summary>
	/// 消息类型
	/// </summary>
	public enum MessageType
	{
	/// <summary>
	/// 上线
	/// </summary>
	OnLine,

	/// <summary>
	/// 下线
	/// </summary>
	OffLine,

	/// <summary>
	/// 普通消息
	/// </summary>
	General,
	}
	}

# 消息内容

封装聊天信息
字节数组的转换：可以单独处理每个数据类型的转换，但是这样做比较麻烦。所以，本文使用内存流、二进制写入器、二进制读取器

代码如下：

ChatMessage

	using System;
	using System.IO;
	using System.Text;

	namespace ChatDemo
	{
	/// <summary>
	/// 聊天信息
	/// </summary>
	public class ChatMessage
	{
	/// <summary>
	/// 消息类型
	/// </summary>
	public MessageType Type;

	/// <summary>
	/// 发送者
	/// </summary>
	public string SenderName;

	/// <summary>
	/// 发送内容
	/// </summary>
	public string Content;

	/// <summary>
	/// ChatMessage
	/// </summary>
	public ChatMessage() { }

	/// <summary>
	/// 赋值
	/// </summary>
	/// <param name="messageType">messageType</param>
	/// <param name="senderName">senderName</param>
	/// <param name="content">content</param>
	public ChatMessage(MessageType messageType, string senderName, string content)
	{
	Type = messageType;
	SenderName = senderName;
	Content = content;
	}

	/// <summary>
	/// object -> byte[]
	/// </summary>
	/// <returns></returns>
	public byte[] ObjectToBytes()
	{
	//string/int/bool... -- 二进制写入器 -- 内存流 --> byte []

	// 内存流
	using (MemoryStream stream = new MemoryStream())
	{
	// 二进制写入器
	// 属性 -> 内存流
	BinaryWriter writer = new BinaryWriter(stream);

	WriteString(writer, Type.ToString());
	WriteString(writer, SenderName);
	WriteString(writer, Content);

	// 内存流 -> byte []
	return stream.ToArray();
	}
	}

	/// <summary>
	/// 写入二进制数据
	/// </summary>
	/// <param name="writer">writer</param>
	/// <param name="str">string</param>
	private void WriteString(BinaryWriter writer, string str)
	{
	// 不用这个，因为这个只支持一种编码
	//writer.Write(str);

	// 编码
	byte[] byte_Type = Encoding.UTF8.GetBytes(str);
	// 写入长度
	writer.Write(byte_Type.Length);
	// 写入内容
	writer.Write(byte_Type);
	}

	/// <summary>
	/// byte[] -> object
	/// </summary>
	/// <param name="bytes">bytes</param>
	/// <returns></returns>
	public static ChatMessage BytesToObject(byte[] bytes)
	{
	//byte [] -- 内存流 -- 二进制读取器 --> string/int/bool...

	using (MemoryStream stream = new MemoryStream(bytes))
	{
	BinaryReader reader = new BinaryReader(stream);

	MessageType type = (MessageType)Enum.Parse(typeof(MessageType), ReadString(reader));
	string senderName = ReadString(reader);
	string content = ReadString(reader);

	return new ChatMessage(type, senderName, content);
	}
	}

	/// <summary>
	/// 读取二进制数据
	/// </summary>
	/// <param name="reader">reader</param>
	/// <returns></returns>
	private static string ReadString(BinaryReader reader)
	{
	// 不用这个，因为这个只支持一种编码
	//reader.ReadString();

	// 读 4 个字节：标记了接下来要读取的长度
	int length = reader.ReadInt32();
	// 读指定的长度
	byte[] bytes = reader.ReadBytes(length);
	// 转字符串
	return Encoding.UTF8.GetString(bytes);
	}
	}
	}

# 登录信息类

储存登录的信息，例如：IP、端口、名字

代码如下：

LogInContent

	namespace ChatDemo
	{
	/// <summary>
	/// 登录信息
	/// </summary>
	public class LogInContent
	{
	/// <summary>
	/// Name
	/// </summary>
	public string Name;

	/// <summary>
	/// IP
	/// </summary>
	public string IP;

	/// <summary>
	/// Port
	/// </summary>
	public string Port;
	}
	}

# 客户端网络服务类

这个类只需要一个，所以使用单例模式
使用 UDP 协议
创建一个线程，用于接收消息
使用事件处理消息的接收：接收到消息后触发事件并传递参数
辅助线程不能访问 Unity 的 API，需要使用线程交叉访问助手解决这个问题

事件参数类：

ReceiveEventArgs

	using System;
	using System.Net;

	namespace ChatDemo
	{
	/// <summary>
	/// 接收事件的信息类
	/// </summary>
	public class ReceiveEventArgs : EventArgs
	{
	/// <summary>
	/// ChatMessage
	/// </summary>
	public ChatMessage Message;

	/// <summary>
	/// IPEndPoint
	/// </summary>
	public IPEndPoint SourceRemote;

	public ReceiveEventArgs() { }

	public ReceiveEventArgs(ChatMessage message, IPEndPoint sourceRemote)
	{
	Message = message;
	SourceRemote = sourceRemote;
	}
	}
	}

客户端网络服务类：

ClientUdpNetService

	using Common;
	using System;
	using System.Net;
	using System.Net.Sockets;
	using System.Threading;

	namespace ChatDemo
	{
	/// <summary>
	/// 客户端 UDP 网络服务
	/// </summary>
	public class ClientUdpNetService : MonoSingleton<ClientUdpNetService>
	{
	/// <summary>
	/// 接收到消息后触发
	/// </summary>
	public event EventHandler<ReceiveEventArgs> OnReceive;

	/// <summary>
	/// 登录信息
	/// </summary>
	public LogInContent Content;

	/// <summary>
	/// UdpClient
	/// </summary>
	private UdpClient UDPClient;

	/// <summary>
	/// 客户端线程
	/// </summary>
	private Thread ClientThread;

	private void Start()
	{
	ClientThread = new Thread(ReceiveMessage);
	}

	/// <summary>
	/// 初始化
	/// 由登录窗口传递 IP 和端口
	/// </summary>
	/// <param name="content"> 登录信息 & lt;/param>
	public void Initialize(LogInContent content)
	{
	Content = content;

	// 随机分配端口
	UDPClient = new UdpClient();

	// 与服务端连接（仅仅是配置自身的 Socket）
	// 单播：只能给服务器发数据
	UDPClient.Connect(IPAddress.Parse(Content.IP), int.Parse(Content.Port));

	// 开启线程
	ClientThread.Start();

	NotiyfSever(MessageType.OnLine);
	}

	private void NotiyfSever(MessageType type)
	{
	if (Content == null) return;
	SendMessage(new ChatMessage(type, Content.Name, string.Empty));
	}

	/// <summary>
	/// 发送数据
	/// </summary>
	/// <param name="message"> 信息 & lt;/param>
	public void SendMessage(ChatMessage message)
	{
	byte[] bytes = message.ObjectToBytes();
	// 创建 Socket 对象时建立了链接，所以不能绑定终结点
	UDPClient.Send(bytes, bytes.Length);
	}

	/// <summary>
	/// 接收消息
	/// </summary>
	/// <param name="message"></param>
	private void ReceiveMessage()
	{
	while (true)
	{
	// 任意 IP 地址，任意端口
	IPEndPoint sourceRemote = new IPEndPoint(IPAddress.Any, 0);

	// 接收消息
	byte[] bytes = UDPClient.Receive(ref sourceRemote);

	// 转化消息
	ChatMessage message = ChatMessage.BytesToObject(bytes);

	// 事件参数
	ReceiveEventArgs args = new ReceiveEventArgs(message, sourceRemote);

	// 在主线程中触发事件
	ThreadCrossHelper.Instance.ExecuteOnMainThread(() =>
	{
	OnReceive?.Invoke(this, args);
	});
	}
	}

	private void OnApplicationQuit()
	{
	NotiyfSever(MessageType.OffLine);
	ClientThread?.Abort();
	UDPClient?.Dispose();
	}
	}
	}

# 登录功能

登录界面分两部分制作，点击按钮切换
使用变换组件助手类寻找物体
注册按钮事件，切换场景
保存用户输入的信息
会涉及到服务端网络服务类的代码，它与客户端网络服务类的代码相似，具体内容会在下文中讲到

登录信息输入，分别挂载到物体 “ClientContent” 和 “SeverContent” 上

LogInInput

	using Common;
	using TMPro;
	using UnityEngine;

	namespace ChatDemo
	{
	/// <summary>
	/// 登录信息输入
	/// </summary>
	public class LogInInput : MonoBehaviour
	{
	/// <summary>
	/// Input_Name
	/// </summary>
	private TMP_InputField Input_Name;
	/// <summary>
	/// Input_IP
	/// </summary>
	private TMP_InputField Input_IP;
	/// <summary>
	/// Input_Port
	/// </summary>
	private TMP_InputField Input_Port;

	/// <summary>
	/// 登录信息
	/// </summary>
	public LogInContent Content
	{
	get
	{
	return new LogInContent()
	{
	Name = Input_Name?.text,
	IP = Input_IP.text,
	Port = Input_Port.text,
	};
	}
	}

	private void Awake()
	{
	Input_Name = this.transform.FindChildByName("Input_Name")?.GetComponent<TMP_InputField>();
	Input_IP = this.transform.FindChildByName("Input_IP").GetComponent<TMP_InputField>();
	Input_Port = this.transform.FindChildByName("Input_Port").GetComponent<TMP_InputField>();
	}
	}
	}

登录按钮的处理，挂载到物体 “Canvas” 上

LogInButtons

	using UnityEngine;
	using UnityEngine.SceneManagement;
	using UnityEngine.UI;

	namespace ChatDemo
	{
	/// <summary>
	/// LogInButton
	/// </summary>
	public class LogInButtons : MonoBehaviour
	{
	/// <summary>
	/// LogInType
	/// </summary>
	private enum LogInType
	{
	/// <summary>
	/// 客户端
	/// </summary>
	Client,

	/// <summary>
	/// 服务端
	/// </summary>
	Sever,
	}

	[Header("Client")]
	[Tooltip("客户端登录")]
	public Button Client;
	[Tooltip("ClientContent")]
	public GameObject ClientContent;
	[Tooltip("ClientImage")]
	private Image ClientImage;

	[Header("Sever")]
	[Tooltip("服务端登录")]
	public Button Sever;
	[Tooltip("SeverContent")]
	public GameObject SeverContent;
	[Tooltip("SeverImage")]
	private Image SeverImage;

	[Header("Enter")]
	[Tooltip("登录按钮")]
	public Button Enter;

	/// <summary>
	/// LogInType
	/// </summary>
	private LogInType LogType;

	private void Awake()
	{
	// 考虑到遍历物体的性能开销，所以不用代码找物体

	ClientImage = Client.GetComponent<Image>();
	SeverImage = Sever.GetComponent<Image>();
	}

	private void Start()
	{
	LogType = LogInType.Client;
	Client.onClick.AddListener(OnClientButtonClick);
	Sever.onClick.AddListener(OnServerButtonClick);
	Enter.onClick.AddListener(OnEnterButtonClick);
	}

	/// <summary>
	/// OnClientButtonClick
	/// </summary>
	private void OnClientButtonClick()
	{
	ClientImage.color = Color.red;
	ClientContent.SetActive(true);

	SeverImage.color = Color.white;
	SeverContent.SetActive(false);

	LogType = LogInType.Client;
	}

	/// <summary>
	/// OnServerButtonClick
	/// </summary>
	private void OnServerButtonClick()
	{
	ClientImage.color = Color.white;
	ClientContent.SetActive(false);

	SeverImage.color = Color.red;
	SeverContent.SetActive(true);

	LogType = LogInType.Sever;
	}

	/// <summary>
	/// OnEnterButtonClick
	/// </summary>
	private void OnEnterButtonClick()
	{
	switch (LogType)
	{
	case LogInType.Client:
	GoClient();
	break;

	case LogInType.Sever:
	GoServer();
	break;

	default:
	break;
	}
	}

	/// <summary>
	/// GoClient
	/// </summary>
	private void GoClient()
	{
	LogInInput logInInput = ClientContent.GetComponent<LogInInput>();
	ClientUdpNetService.Instance.Initialize(logInInput.Content);

	SceneManager.LoadScene("ChatDemoClient", LoadSceneMode.Single);
	}

	/// <summary>
	/// GoServer
	/// </summary>
	private void GoServer()
	{
	LogInInput logInInput = SeverContent.GetComponent<LogInInput>();
	SeverUdpNetService.Instance.Initialize(logInInput.Content);

	SceneManager.LoadScene("ChatDemoSever", LoadSceneMode.Single);
	}
	}
	}

# 客户端的脚本

制作 UI 界面
接收消息、发送消息、生成消息（预制件）

消息的拥有者

MessageOwer

	namespace ChatDemo
	{
	/// <summary>
	/// 消息的拥有者
	/// </summary>
	public enum MessageOwer
	{
	My,
	Other
	}
	}

挂载到预制件上

ClientMessageManger

	using Common;
	using System;
	using TMPro;
	using UnityEngine;
	using UnityEngine.UI;

	namespace ChatDemo
	{
	/// <summary>
	/// 客户端信息管理
	/// </summary>
	public class ClientMessageManger : MonoBehaviour
	{
	/// <summary>
	/// 设置信息
	/// </summary>
	/// <param name="message"> 信息 & lt;/param>
	/// <param name="name"> 发送者 & lt;/param>
	public void SetMessage(string message, string name)
	{
	this.transform.FindChildByName("Message").GetComponent<TextMeshProUGUI>().text = message;
	this.transform.FindChildByName("Name").GetComponent<TextMeshProUGUI>().text = name;
	this.transform.FindChildByName("Time").GetComponent<TextMeshProUGUI>().text = DateTime.Now.ToString();
	}
	}
	}

挂载到 “Content” 上

CreateClientMessage

	using UnityEngine;

	namespace ChatDemo
	{
	/// <summary>
	/// 创建客户端消息
	/// </summary>
	public class CreateClientMessage : MonoBehaviour
	{
	[Tooltip("我的消息预制件")]
	public GameObject MessagePrefab_My;
	[Tooltip("其他人的消息预制件")]
	public GameObject MessagePrefab_Other;

	/// <summary>
	/// 增加新消息
	/// </summary>
	/// <param name="ower"> 消息属于谁 & lt;/param>
	/// <param name="chatMessage"> 消息 & lt;/param>
	public void AddMessage(MessageOwer ower, ChatMessage chatMessage)
	{
	switch (ower)
	{
	case MessageOwer.My:
	Create(MessagePrefab_My, chatMessage);
	break;

	case MessageOwer.Other:
	Create(MessagePrefab_Other, chatMessage);
	break;

	default:
	break;
	}
	}

	/// <summary>
	/// 创建物体
	/// </summary>
	/// <param name="prefab"> 预制件 & lt;/param>
	/// <param name="chatMessage"> 信息 & lt;/param>
	private void Create(GameObject prefab, ChatMessage chatMessage)
	{
	GameObject obj = Instantiate(prefab, this.transform);
	obj.GetComponent<ClientMessageManger>().SetMessage(chatMessage.Content, chatMessage.SenderName);
	}
	}
	}

挂载到 “Canvas” 上

ChatClient

	using Common;
	using TMPro;
	using UnityEngine;
	using UnityEngine.UI;

	namespace ChatDemo
	{
	/// <summary>
	/// 客户端逻辑
	/// </summary>
	public class ChatClient : MonoBehaviour
	{
	[Tooltip("增加消息")]
	public CreateClientMessage Create;

	/// <summary>
	/// SendButton
	/// </summary>
	private Button SendButton;
	/// <summary>
	/// 输入的信息
	/// </summary>
	private TMP_InputField InputMessage;

	private void Awake()
	{
	SendButton = this.transform.FindChildByName("SendButton").GetComponent<Button>();
	InputMessage = this.transform.FindChildByName("InputMessage").GetComponent<TMP_InputField>();
	}

	private void Update()
	{
	if (Input.GetKey(KeyCode.LeftControl) && Input.GetKey(KeyCode.Return))
	{
	OnSendMessage();
	}
	}

	private void OnEnable()
	{
	SendButton.onClick.AddListener(OnSendMessage);
	ClientUdpNetService.Instance.OnReceive += OnReceiveMessage;
	}

	private void OnDisable()
	{
	SendButton.onClick.RemoveListener(OnSendMessage);
	ClientUdpNetService.Instance.OnReceive -= OnReceiveMessage;
	}

	/// <summary>
	/// 按下发送消息按钮
	/// </summary>
	private void OnSendMessage()
	{
	if (InputMessage.text == string.Empty) return;

	ChatMessage message = new ChatMessage()
	{
	Type = MessageType.General,
	SenderName = ClientUdpNetService.Instance.Content.Name,
	Content = InputMessage.text
	};

	Create.AddMessage(MessageOwer.My, message);
	ClientUdpNetService.Instance.SendMessage(message);

	InputMessage.text = string.Empty;
	}

	/// <summary>
	/// 接收消息
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="receive"></param>
	private void OnReceiveMessage(object sender, ReceiveEventArgs receive)
	{
	if (receive.Message.SenderName != ClientUdpNetService.Instance.Content.Name)
	{
	Create.AddMessage(MessageOwer.Other, receive.Message);
	}
	}
	}
	}

# 服务端网络服务类

需要分配 IP 和端口
使用列表储存所有已经上线的客户端
其他部分与客户端网络服务类类似

代码如下：

SeverUdpNetService

	using Common;
	using System;
	using System.Collections.Generic;
	using System.Net;
	using System.Net.Sockets;
	using System.Threading;

	namespace ChatDemo
	{
	/// <summary>
	/// 服务端 UDP 网络服务
	/// </summary>
	public class SeverUdpNetService : MonoSingleton<SeverUdpNetService>
	{
	/// <summary>
	/// 接收到消息后触发
	/// </summary>
	public event EventHandler<ReceiveEventArgs> OnReceive;

	/// <summary>
	/// 登录信息
	/// </summary>
	public LogInContent Content;

	/// <summary>
	/// UdpClient
	/// </summary>
	private UdpClient UDPClient;

	/// <summary>
	/// 服务端线程
	/// </summary>
	private Thread SeverThread;

	/// <summary>
	/// 客户端列表
	/// </summary>
	public List<IPEndPoint> ClientRemotes { get; private set; }

	private void Start()
	{
	ClientRemotes = new List<IPEndPoint>();
	SeverThread = new Thread(ReceiveMessage);
	}

	/// <summary>
	/// 初始化
	/// 由登录窗口传递 IP 和端口
	/// </summary>
	/// <param name="content"> 登录信息 & lt;/param>
	public void Initialize(LogInContent content)
	{
	Content = content;

	// 分配端口
	IPEndPoint iPEndPoint = new IPEndPoint(IPAddress.Parse(Content.IP), int.Parse(Content.Port));
	UDPClient = new UdpClient(iPEndPoint);

	// 开启线程
	SeverThread.Start();
	}

	/// <summary>
	/// 发送数据
	/// </summary>
	/// <param name="message"> 信息 & lt;/param>
	/// <param name="remote"> 目标终结点 & lt;/param>
	public void SendMessage(ChatMessage message, IPEndPoint remote)
	{
	byte[] bytes = message.ObjectToBytes();
	UDPClient.Send(bytes, bytes.Length, remote);
	}

	/// <summary>
	/// 接收消息
	/// </summary>
	private void ReceiveMessage()
	{
	while (true)
	{
	// 任意 IP 地址，任意端口
	IPEndPoint sourceRemote = new IPEndPoint(IPAddress.Any, 0);

	// 接收消息
	byte[] bytes = UDPClient.Receive(ref sourceRemote);

	// 转化消息
	ChatMessage message = ChatMessage.BytesToObject(bytes);

	// 根据消息类型执行对应的逻辑
	MessageReceived(message, sourceRemote);

	// 事件参数
	ReceiveEventArgs args = new ReceiveEventArgs(message, sourceRemote);

	// 在主线程中触发事件
	ThreadCrossHelper.Instance.ExecuteOnMainThread(() =>
	{
	OnReceive?.Invoke(this, args);
	});
	}
	}

	/// <summary>
	/// 根据消息类型执行对应的逻辑
	/// </summary>
	/// <param name="message"></param>
	/// <param name="remote"></param>
	private void MessageReceived(ChatMessage message, IPEndPoint remote)
	{
	switch (message.Type)
	{
	case MessageType.OnLine:
	ClientRemotes.Add(remote);
	break;

	case MessageType.OffLine:
	ClientRemotes.Remove(remote);
	break;

	case MessageType.General:
	ClientRemotes.ForEach((item) => { SendMessage(message, item); });
	break;

	default:
	break;
	}
	}

	private void OnApplicationQuit()
	{
	SeverThread?.Abort();
	UDPClient?.Dispose();
	}
	}
	}

# 服务端的脚本

制作 UI
接收消息、生成消息（预制件）
消息的预制件会频繁地创建和销毁，可以使用对象池

挂载到预制件上

SeverMessageManger

	using Common;
	using System.Net;
	using TMPro;
	using UnityEngine;

	namespace ChatDemo
	{
	/// <summary>
	/// 服务端信息管理
	/// </summary>
	public class SeverMessageManger : MonoBehaviour
	{
	/// <summary>
	/// 设置信息
	/// </summary>
	/// <param name="sourceRemote">source remote</param>
	public void SetMessage(IPEndPoint sourceRemote)
	{
	this.transform.FindChildByName("SourceIPInformation").GetComponent<TextMeshProUGUI>().text = sourceRemote.Address.ToString();
	this.transform.FindChildByName("SourcePortInformation").GetComponent<TextMeshProUGUI>().text = sourceRemote.Port.ToString();
	}
	}
	}

挂载到 “Content” 上

CreateSeverMessage

	using Common;
	using System.Net;
	using UnityEngine;

	namespace ChatDemo
	{
	/// <summary>
	/// 创建服务端消息
	/// </summary>
	public class CreateSeverMessage : MonoBehaviour
	{
	[Tooltip("服务端消息预制件")]
	public GameObject SeverMessage;

	public void AddMessage(IPEndPoint sourceRemote)
	{
	for (int i = 0; i < this.transform.childCount; i++)
	{
	ObjectPool.Instance.RecoverGameObject(this.transform.GetChild(i).gameObject);
	}

	for (int i = 0; i < SeverUdpNetService.Instance.ClientRemotes.Count; i++)
	{
	GameObject obj = ObjectPool.Instance.GetGameObject("SeverMessage", SeverMessage, this.transform);
	obj.GetComponent<SeverMessageManger>().SetMessage(sourceRemote);
	}
	}
	}
	}

挂载到 “SeverWindow” 上

ChatSever

	using UnityEngine;

	namespace ChatDemo
	{
	/// <summary>
	/// 服务端逻辑
	/// </summary>
	public class ChatSever : MonoBehaviour
	{
	[Tooltip("增加消息")]
	public CreateSeverMessage Create;

	private void OnEnable()
	{
	SeverUdpNetService.Instance.OnReceive += OnReceiveMessage;
	}

	private void OnDisable()
	{
	SeverUdpNetService.Instance.OnReceive -= OnReceiveMessage;
	}

	/// <summary>
	/// 接收消息
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="receive"></param>
	private void OnReceiveMessage(object sender, ReceiveEventArgs receive)
	{
	if (receive.Message.Type != MessageType.General)
	{
	Create.AddMessage(receive.SourceRemote);
	}
	}
	}
	}

# 切换场景不销毁物体

客户端网络服务类、服务端网络服务类、线程交叉访问助手类都挂载到同一个物体上
在切换场景后还需要使用这个物体，所以不能销毁

代码如下：

KeepObject

	using UnityEngine;

	namespace ChatDemo
	{
	/// <summary>
	/// 切换场景保留物体
	/// </summary>
	public class KeepObject : MonoBehaviour
	{
	private void Start()
	{
	DontDestroyOnLoad(this.gameObject);
	}
	}
	}