以下代码环境要求：win8或win10, .net4.5+IIS8

win7上是IIS7，win7上.net本身不直接支持websocket, win7可以用superwebsocket, 或自己根据协议用TCPListener实现

 

handler代码：

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using System;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
using System.Web.WebSockets;

namespace websocket
{
    /// <summary>
    /// Handler1 的摘要说明
    /// </summary>
    public class Handler1 : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            if (context.IsWebSocketRequest)
            {
                context.AcceptWebSocketRequest(ProcessChat);
            } 
        }

        private async Task ProcessChat(AspNetWebSocketContext context)
        {
            WebSocket socket = context.WebSocket;
            while (true) {
                if (socket.State == WebSocketState.Open)
                {
                    ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[2048]);
                    WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);
                    string userMsg = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);
                    userMsg = "你发送了：" + userMsg + "于" + DateTime.Now.ToLongTimeString();
                    buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMsg));
                    await socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                }
                else
                {
                    break;
                }
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

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前台代码：

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<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="jquery-2.0.3.min.js"></script>
    <script>
        var ws;
        $().ready(function ()
        {
            $('#conn').click(function ()
            {
                ws = new WebSocket('ws://' + window.location.hostname+':'+window.location.port + '/Handler1.ashx');
                $('#tips').text('正在连接');
                ws.onopen = function ()
                {
                    $('#tips').text('已经连接');
                }
                ws.onmessage = function (evt)
                {
                    $('#tips').text(evt.data);
                }
                ws.onerror = function (evt)
                {
                    $('#tips').text(JSON.stringify(evt));
                }
                ws.onclose = function ()
                {
                    $('#tips').text('已经关闭');
                }
            });

            $('#close').click(function ()
            {
                ws.close();
            });

            $('#send').click(function ()
            {
                if (ws.readyState == WebSocket.OPEN) {
                    ws.send($('#content').val());
                }
                else {
                    $('#tips').text('连接已经关闭');
                }
            });

        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <input id="conn" type="button" value="连接" />
        <input id="close" type="button"  value="关闭"/>
        <span id="tips"></span>
        <input id="content" type="text" />
        <input id="send" type="button"  value="发送"/>
    </div>
    </form>
</body>

web.config:

  <system.web>
    <httpRuntime targetFramework="4.5"/>
  </system.web>
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