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WebSocket在Asp.Net中的例子

环境

以下代码环境要求：win8或win10, .net4.5+IIS8
部署到IIS8上面转到 Windows程序和功能 -打开Windows功能里面 IIS选项启动4.5 和WebSocket支持否则会报错误的。
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
我使用VS2013+iis EXPRESS 执行也失败，context.IsWebSocketRequest一直为false，建议用VS2015和系统的IIS 8部署环境，不要用vs环境

Index.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="SimpleWebSocket.WebForm" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <span id="webSocketStatusSpan"></span>
            <br />
            <span id="webSocketReceiveDataSpan"></span>
            <br />
            <span>请输入一个字符串</span>
            <br />
            <input id="nameTextBox" type="text" value="" />
            <input type="button" value="Send data" onclick="SendData();" />
            <input type="button" value="Close WebSocket" onclick="CloseWebSocket();" />
        </div>
    </form><script type="text/javascript">

        var webSocketStatusSpan = document.getElementById("webSocketStatusSpan");
        var webSocketReceiveDataSpan = document.getElementById("webSocketReceiveDataSpan");
        var nameTextBox = document.getElementById("nameTextBox");

        var webSocket;

        //HTTP处理程序的地址
        //var handlerUrl = "ws://localhost:2659/SimpleWebSocket/WebSocketHandler.ashx";
        var handlerUrl = "ws://localhost:2659/WebSocketHandler.ashx";

        function SendData() {

            //初始化WebSocket
            InitWebSocket();

            //如果WebSocket打开，发送数据
            if (webSocket.OPEN && webSocket.readyState == 1)
                webSocket.send(nameTextBox.value);

            //如果WebSocket关闭，显示消息
            if (webSocket.readyState == 2 || webSocket.readyState == 3)
                webSocketStatusSpan.innerText = "WebSocket关闭了，无法发送数据";
        }

        function CloseWebSocket() {
            webSocket.close();
        }

        function InitWebSocket() {

            //如果WebSocket对象未初始化，我们将初始化它
            if (webSocket == undefined) {
                webSocket = new WebSocket(handlerUrl);
                //打开连接处理程序
                webSocket.onopen = function () {
                    webSocketStatusSpan.innerText = "WebSocket打开了.";
                    webSocket.send(nameTextBox.value);
                };

                //消息数据处理程序
                webSocket.onmessage = function (e) {
                    webSocketReceiveDataSpan.innerText = e.data;
                };

                //关闭事件处理程序
                webSocket.onclose = function () {
                    webSocketStatusSpan.innerText = "WebSocket closed.";
                };

                //错误事件处理程序
                webSocket.onerror = function (e) {
                    webSocketStatusSpan.innerText = e.message;
                }
            }
        }
    </script>
</body>
</html>

WebSocketHandler.ashx代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
using System.Web.WebSockets;

namespace SimpleWebSocket
{
    /// <summary>
    /// 
    /// </summary>
    public class WebSocketHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            //检查 查询是否是WebSocket请求
            if (HttpContext.Current.IsWebSocketRequest)  
            {
                //如果是，我们附加异步处理程序
                context.AcceptWebSocketRequest(WebSocketRequestHandler);
            }
        }

        public bool IsReusable { get { return false; } }

        //异步请求处理程序
        public async Task WebSocketRequestHandler(AspNetWebSocketContext webSocketContext)
        {
            //获取当前的WebSocket对象
            WebSocket webSocket = webSocketContext.WebSocket;

            /*
             * 我们定义一个常数，它将表示接收到的数据的大小。 它是由我们建立的，我们可以设定任何值。 我们知道在这种情况下，发送的数据的大小非常小。
            */
            const int maxMessageSize = 1024;

            //received bits的缓冲区
            var receivedDataBuffer = new ArraySegment<Byte>(new Byte[maxMessageSize]);

            var cancellationToken = new CancellationToken();

            //检查WebSocket状态
            while (webSocket.State == WebSocketState.Open)
            {
                //读取数据 
                WebSocketReceiveResult webSocketReceiveResult = await webSocket.ReceiveAsync(receivedDataBuffer, cancellationToken);

                //如果输入帧为取消帧，发送close命令
                if (webSocketReceiveResult.MessageType == WebSocketMessageType.Close)
                {
                    await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, String.Empty, cancellationToken);
                }
                else
                {
                        byte[] payloadData = receivedDataBuffer.Array.Where(b => b != 0).ToArray();

                        //因为我们知道这是一个字符串，我们转换它
                        string receiveString = System.Text.Encoding.UTF8.GetString(payloadData, 0, payloadData.Length);

                        //将字符串转换为字节数组. 
                        var newString = String.Format("Hello, " + receiveString + " ! Time {0}", DateTime.Now.ToString());
                        Byte[] bytes = System.Text.Encoding.UTF8.GetBytes(newString);

                        //发回数据
                        await webSocket.SendAsync(new ArraySegment<byte>(bytes), WebSocketMessageType.Text, true, cancellationToken);
                }

            }
        }
    }

}

运行结果:

这里写图片描述

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原文地址：https://www.cnblogs.com/zxtceq/p/7280641.html