SignalR 入门 《一》

1.打开VS,创建一个ASP.NET Web Application。

2.在新打开的窗口选择 “Empty”,然后创建项目

3.在解决方案窗口,右击刚新建的项目,为项目添加一个SignalR Hub Class (v2)集线器类,命名为ChatHub.cs。

  注:在新建此类时,vs会添加SignalR必须的一些程序集和脚本文件,

      假如没有添加程序集的话可以打开NuGet程序包管理器控制台,然后

    输入install-package Microsoft.AspNet.SignalR来添加程序集。

4 修改刚新建的ChatHub.cs的内容为:

using Microsoft.AspNet.SignalR;
using System.Threading.Tasks;
using System.Diagnostics;

namespace HelloSignalR
{
    public class ChatHub : Hub
    {
        public void Send(string name, string massage)
        {
            //去调用所有连接上的客户端中SendMessage()方法
            //即SendMessage是定义在客户端的一个javascript方法
            Clients.All.SendMessage(name, massage);
        }

        /// <summary>
        /// 客户端连接上时,会进入到此方法中
        /// </summary>
        /// <returns></returns>
        public override Task OnConnected()
        {
            Trace.WriteLine("客户端连接成功");
            return base.OnConnected();
        }

        public override Task OnReconnected()
        {
            Trace.WriteLine("客户端重连中");
            return base.OnReconnected();
        }

        public override Task OnDisconnected(bool stopCalled)
        {
            return base.OnDisconnected(stopCalled);
        }
    }
}

5.为项目添加一个OWIN Startup Class,命名为Startup.cs,具体内容为:

using Microsoft.Owin;
using Owin;

//OWIN(Open Web Interface for .NET)是一套开放网站界面标准

[assembly:OwinStartup(typeof(HelloSignalR.Startup))]
namespace HelloSignalR
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            // Any connection or hub wire up and configuration should go here
            app.MapSignalR(); 
        }
    }
}

 

6 为项目添加一个html页面,命名为index.html,具体内容如下:

<!DOCTYPE html>
<html>
<head>
    <title>SignalR Simple Chat</title>
    <style type="text/css">
        .container {
            background-color: #99CCFF;
            border: thick solid #808080;
            padding: 20px;
            margin: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <input type="text" id="message" />
        <input type="button" id="sendmessage" value="Send" />
        <input type="hidden" id="displayname" />
        <ul id="discussion"></ul>
    </div>

    <!--Script references. -->
    <!--Reference the jQuery library. -->
    <script src="Scripts/jquery-1.10.2.min.js"></script>
    <!--Reference the SignalR library. -->
    <script src="Scripts/jquery.signalR-2.1.2.js"></script>
    <!--Reference the autogenerated SignalR hub script.it's necessary. -->
    <script src="signalr/hubs"></script>
    <!--Add script to update the page and send messages.-->
    <script type="text/javascript">
        $(function () {
            // Declare a proxy to reference the hub.
            var chat = $.connection.chatHub;
            // Create a function that the hub can call to broadcast messages.
            chat.client.SendMessage = function (name, message) {
                // Html encode display name and message.
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();
                // Add the message to the page.
                $('#discussion').append('<li><strong>' + encodedName
                    + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };
            // Get the user name and store it to prepend to messages.
            $('#displayname').val(prompt('Enter your name:', ''));
            // Set initial focus to message input box.
            $('#message').focus();
            // Start the connection.
            $.connection.hub.start().done(function () {
                $('#sendmessage').click(function () {
                    // Call the Send method on the hub.
                    chat.server.send($('#displayname').val(), $('#message').val());
                    // Clear text box and reset focus for next comment.
                    $('#message').val('').focus();
                });
            });

            document.onkeydown = function (event) {
                var e = event || window.event || arguments.callee.caller.arguments[0];
                if (e && e.keyCode == 13) { // enter 键
                    $('#sendmessage').click();
                }
            };
        });
    </script>
</body>
</html>

7 生成项目,然后运行网站,即可完成此Demo

 

posted @ 2018-04-24 09:55  weston43  阅读(109)  评论(0)    收藏  举报