MVC signalR例子

1，SignalR是一个运行在.NET 平台上的 html websocket 框架，它出现的主要目的是实现服务器主动推送（Push）消息到客户端页面 具体使用如下：

一、安装

打开管理NuGet程序包，搜索SignalR，安装下面这些程序包

 安装完成后程序中会多出一些引用

 二、使用

因为用的是SignalR2，所以需要新建Startup.cs类,配置集线器，编写如下

using Microsoft.Owin;
using Owin;

[assembly: OwinStartupAttribute(typeof(MvcSignalR.Startup))]
namespace MvcSignalR
{
    public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}

接着编写HUb类

using Microsoft.AspNet.SignalR;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Web;

namespace MvcSignalR.Services
{
    /// <summary>
    /// 数据交流类
    /// </summary>
    public class ChatServiceHub : Hub
    {
        //所有的ConnectionId，时间的作用将来设置定时器，每隔多长时间清理下无用的ConnectionId
        public static ConcurrentDictionary<string, DateTime> AllConnectionIDs = new ConcurrentDictionary<string, DateTime>();
        //用户的ConnectionID，一个ID对应一个用户
        public static ConcurrentDictionary<string, string> UserConnectionIDs = new ConcurrentDictionary<string, string>();

        private Random rd = new Random();

        public void Send(string message)
        {
            int i = 0;
            while (i < 10000)
            {
                i++;
                Thread.Sleep(100);
                Clients.Client(Context.ConnectionId).broadcastMessage(Context.ConnectionId, message + rd.Next(1000));
            }
        }

        public void SendMessage(string message)
        {
            Clients.Client(Context.ConnectionId).receiveMessage(message + rd.Next(1000));
        }

        public override Task OnConnected()
        {
            AllConnectionIDs.AddOrUpdate(Context.ConnectionId, DateTime.Now, (key, oldValue) => DateTime.Now);
            return base.OnReconnected();
        }
    }
}

编写前端代码

引用js

$(function () {
    // Declare a proxy to reference the hub.
    var chat = $.connection.chatServiceHub;
    // 接受信息
    chat.client.receiveMessage = function (message) {
        receiveMessage(message);
    };
    var hubStartDone = function () {
        $.connection.hub.start().done();
    };
    hubStartDone();

    $.connection.hub.disconnected(function () {
        setTimeout(function () {
            console.log("disconnected");
            hubStartDone();
        }, 50000); // Restart connection after 50 seconds.
    });

    //发送信息
    $('.sendBtn').on('click', function () {
        debugger
        var news = $('#dope').val();
        if (news == '') {
            alert('不能为空');
        } else {
            chat.server.sendMessage(news);
        }
    });


  function receiveMessage(message) {        
        var answer = '';
        answer += '<li>' +
                    '<div class="answerHead"><img src="/Images/qq/1003.jpg"/></div>' +
                    '<div class="answers"><img class="jiao" src="/Images/qq/jiao.jpg">' + message + '</div>' +
                '</li>';
        $('.newsList').append(answer);
        $('.RightCont').scrollTop($('.RightCont')[0].scrollHeight);
    }
}）；