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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"}