WebForm SignalR 实时消息推送

原文：https://www.jianshu.com/p/ae25d0d77011

官方文档：https://docs.microsoft.com/zh-cn/aspnet/signalr/

实现效果

WebFrom + SignalR 实时消息，聊天室，即时消息

代码示例

动态链接库

添加基础动态链接库

 Microsoft.AspNet.SignalR.Core.dll

 Microsoft.AspNet.SignalR.Owin.dll

 Microsoft.AspNet.SignalR.SystemWeb.dll

 Microsoft.Owin.Host.SystemWeb.dll

 Owin.dll

 Newtonsoft.Json.dll

Global.asax

应用程序文件添加MapHubs

 public class Global : System.Web.HttpApplication

 {

     protected void Application_Start(object sender, EventArgs e)

     {

        RouteTable.Routes.MapHubs();

     }

 }

继承 Hub

编写集成类

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using Microsoft.AspNet.SignalR;

 /// <summary>

 /// PushHub 的摘要说明

 /// </summary>

 public class PushHub : Hub

 {

     public PushHub()

     {

         //

         // TODO: 在此处添加构造函数逻辑

         //

     }

 }

聊天室页面

 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ChatRoom.aspx.cs" Inherits="WebApp.CustomApp.Message.ChatRoom" %>

 <!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>

     <!-- 新 Bootstrap 核心 CSS 文件 -->

     <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">

     <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->

     <script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>

     <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->

     <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

     <script src="../../Plugins/jquery.signalR-1.1.4.js" type="text/javascript"></script>

     <script src="/Signalr/Hubs"></script>

     <script>

         function SendMsg() {

             var data = { name: $("#txtName").val(), msg: $("#txtMessage").val() };

             $.post("ChatRoom.aspx", data, function (msg) { });

         }

         var pushHub = $.connection.pushHub;

         pushHub.client.sendMessage = function (name, message, time) {

             var flag = time + " " + name + " 说：" + message + "\r\n";

             $("#txtChatLog").val($("#txtChatLog").val() + flag);

         }

         $.connection.hub.logging = true;

         $.connection.hub.start();

     </script>

 </head>

 <body>

     <form>

         <div class="container">

             <div class="row">

                 <br />

                 <div class="form-group">

                     <label for="txtName">用户名</label>

                     <input type="text" class="form-control" id="txtName" placeholder="用户名" />

                 </div>

                 <div class="form-group">

                     <label for="txtMessage">消息内容</label>

                     <input type="text" class="form-control" id="txtMessage" placeholder="消息内容" />

                 </div>

                 <button type="button" class="btn btn-default" onclick="SendMsg()">发送</button>

                 <br />

                 <div class="form-group">

                     <label for="txtMessage">聊天记录</label>

                     <textarea id="txtChatLog" class="form-control" cols="" rows=""></textarea>

                 </div>

             </div>

         </div>

     </form>

 </body>

 </html>

聊天室后台

 using Microsoft.AspNet.SignalR;

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using System.Web.UI;

 using System.Web.UI.WebControls;

 namespace WebApp.CustomApp.Message

 {

     public partial class ChatRoom : System.Web.UI.Page

     {

         protected void Page_Load(object sender, EventArgs e)

         {

             if (!IsPostBack)

             {

                 if (Request.Form["name"] != null)

                 {

                     SendMsg(Request.Form["name"].ToString(), Request.Form["msg"].ToString());

                 }

             }

         }

         private void SendMsg(string name,string msg)

         {

             IHubContext chat = GlobalHost.ConnectionManager.GetHubContext<PushHub>();

             chat.Clients.All.sendMessage(name, msg, DateTime.Now.ToString());

         }

     }

 }

注意事项

未生成 /Signalr/Hubs 脚本文件

如果通过浏览器查看时无法浏览 /Signalr/Hubs，可能是 Global.asax 未初始化 RouteTable.Routes.MapHubs();

Global.asax 中 RouteTable.Routes 找不到 MapHubs()

方式一

导入 System.Web.Routing

 <%@ Import Namespace="System.Web.Routing" %>

方式二

或在 App_Code 文件夹下新建 Global.aspx.cs 文件，同时将原始 Global.aspx 修改如下

<%@ Application Codebehind="App_Code\Global.asax.cs" Inherits="Global" Language="C#" %>

秒客网