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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

1. 安装包

Install-Package WebSocketSharp -Pre

2. 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();}public static void End(){wssv.Stop();}}
}

3. 创建CaseInfoBehavior

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using WebSocketSharp;
using WebSocketSharp.Server;namespace CaseAuto.helper.websocket
{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);}}}
}

5. 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; }}public enum MsgType { NORMAL=0,GROUP=1,TO_RECIVER = 2,}
}

6. 使用

WebSocketHelper.Init();

二.客户端

新建一个.net项目，如websocket.client

1. 安装包

Install-Package WebSocketSharp -Pre

2. 使用

        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

1. 启动分别启动服务端、客户端
2. 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

3. 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：


4. 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

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