C# 实现websocket双向通信

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本文基于WebSocketSharp实现了websocket双向通信，除基本的客户端向服务端发送消息外，也支持客户端向指定的客户端发送消息、群发消息，其他协议可自定义。废话不多说，直接上干货。

一.服务端

新建一个.net项目，如websocket.server

安装包

Install-Package WebSocketSharp -Pre
定义WebSocketHelper

using CaseAuto.helper.websocket;
using System.Collections.Generic;
using WebSocketSharp.Server;

namespace CaseAuto.helper
{
public class WebSocketHelper
{
static WebSocketServer wssv = new WebSocketServer("ws://127.0.0.1");
private static Dictionary<string,CaseInfoBehavior> clients = new Dictionary<string,CaseInfoBehavior>();
public static void Init()
{
wssv.AddWebSocketService<CaseInfoBehavior>("/caseInfo",()=>new CaseInfoBehavior(clients));
wssv.Start();
}
复制代码
```
     public static void End()
     {
         wssv.Stop();
     }
 }
```
}

创建CaseInfoBehavior

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using WebSocketSharp;
using WebSocketSharp.Server;

namespace CaseAuto.helper.websocket
{

复制代码

 public class CaseInfoBehavior : WebSocketBehavior
 {
     private string _username;
     private Dictionary<string, CaseInfoBehavior> _clients = new Dictionary<string, CaseInfoBehavior>();

     public CaseInfoBehavior(Dictionary<string,CaseInfoBehavior> clients)
     {
         _clients = clients;
     }

     protected override void OnMessage(MessageEventArgs e)
     {
         var data=JsonConvert.DeserializeObject<WebSocketMsgModel>(e.Data);
         switch (data.msgType){
             case MsgType.NORMAL:
                 var msg = $"This msg from serve,I recive msg:{data.content}";
                 Send(msg);
                 break;
             case MsgType.GROUP:
                 SendMessageToAll(data.content);
                 //Sessions.Broadcast(data.content);
                 break;
             case MsgType.TO_RECIVER:
                 SendMessageToReciver(data.reciver, data.content);
                 break;
             default:
                 break;
         }
        
     }

     protected override void OnOpen()
     {
         _username = Context.QueryString["name"];
         if (string.IsNullOrEmpty(_username))
         {
             _username = this.ID;
             return;
         }


         _clients.Add(_username, this);
         Console.WriteLine("Client connected: " + _username);
     }

     protected override void OnClose(CloseEventArgs e)
     {
         _clients.Remove(_username);
         Console.WriteLine("Client connected: " + _username);
     }


     protected void SendMessageToReciver(string reciver,string message)
     {
         foreach (var client in _clients)
         {
             if (client.Key == reciver) { 
                 client.Value.Send(message);
                 break;
             }
         }
     }

     protected void SendMessageToAll(string message)
     {
         foreach (var client in _clients)
         {
             client.Value.Send(message);
         }
     }
 }

}

创建WebSocketMsgModel

namespace CaseAuto.helper.websocket
{
public class WebSocketMsgModel
{
public MsgType msgType { get; set; }
public string content{ get; set; }
public string sender { get; set; }
public string reciver { get; set; }
}
复制代码
```
 public enum MsgType { 
     NORMAL=0,
     GROUP=1,
     TO_RECIVER = 2,
 }
```
}
使用

WebSocketHelper.Init();

二.客户端

新建一个.net项目，如websocket.client

安装包

Install-Package WebSocketSharp -Pre

使用

复制代码

     static void Main(string[] args)
     {
         using (var ws = new WebSocket("ws://127.0.0.1/caseInfo?name=c1"))
         {
             string? response = string.Empty;
             ws.OnMessage += (sender, e) =>
             {
                 response = e.Data;
                 Console.WriteLine("Response: " + response);
             };
             ws.Connect();
             while (true)
             {
                 string? request = Console.ReadLine();

                 ws.Send(request);
                 Console.ReadKey(true);
             }
         }
     }

三.调试

启动分别启动服务端、客户端
客户端控制台输入【常规通讯测试】

{"msgType":0,"content":"hello"}

输入后，回车，服务端返回

启动apipost，新建websocket,输入以下内容【群发】

ws://127.0.0.1/caseInfo?name=c2
{"msgType":1,"content":"hello456","reciver":"c1"}

点击连接：

点击发送：

指定人发送

将apipost中发送的消息变为下面内容，重新观察apipost和自定义客户端

复制代码

{"msgType":2,"content":"hello c1","reciver":"c1"}