using Microsoft.Owin;
using Owin;
[assembly: OwinStartup(typeof(SignalRStartup.Startup))]
namespace SignalRStartup
{
  public class Startup
  {
    public void Configuration(IAppBuilder app)
    {
      // 配置集线器 
      app.MapSignalR();
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;
using Microsoft.AspNet.SignalR;
namespace signalR
{
  public class ServerHub : Hub
  {
    public void SendMsg(string message)
    {
      //调用所有客户端的sendMessage方法(sendMessage有2个参数) 
      Clients.All.sendMessage(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), message);
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace signalR.Controllers
{
  public class HomeController : Controller
  {
    public ActionResult Index()
    {
      return View();
    }
  }
}

@{ 
  ViewBag.title = "SignaIR聊天窗口"; 
} 
<div class="container"> 
  <input type="text" id="message" /> 
  <input type="button" id="sendmessage" value="biubiu" /> 
  <ul id="messageBox"></ul> 
</div> 
@section scripts 
{ 
  <script src="~/Scripts/jquery.signalR-2.2.2.min.js"></script> 
  <script src="~/signalr/hubs"></script> 
  <script> 
    $(function () { 
      //引用自动生成的集线器代理 
      var chat = $.connection.serverHub; 
      //定义服务器调用的客户端sendMessage来显示新消息 
      chat.client.sendMessage = function (name, message) 
      { 
        //向页面添加消息 
        $("#messageBox").append('<li><strong style="color:green">'+name+'</strong>:'+message+'</li>'); 
      } 
      //设置焦点到输入框 
      $('#message').focus(); 
      //开始连接服务器 
      $.connection.hub.start().done(function () { 
        $('#sendmessage').click(function () { 
          //调用服务器端集线器的Send方法 
          chat.server.sendMsg($('#message').val()); 
          //清空输入框信息并获取焦点 
          $("#message").val('').focus(); 
        }) 
      }) 
    }); 
  </script> 
} 

 public void AddToRoom(string groupName, string userName)
    {
      //将连接添加到指定的组（Groups为HubBase中的接口属性）
      Groups.Add(Context.ConnectionId, groupName);
      //根据组名称获取对应客户端的组,调用该组的addUserIn方法
      Clients.Group(groupName, new string[0]).addUserIn(groupName, userName);
    }
    public void Send(string groupName, string detail, string userName)
    {
      //Clients.All.addSomeMessage(detail);//群发给所有
      //调用客户端某一个组的addSomeMessage
      Clients.Group(groupName, new string[0]).addSomeMessage(groupName, detail, userName);
    }

 chat.client.addSomeMessage = function(groupId, detail, userName) {
        console.info("广播消息：" + detail);
        $("#contentMsg").append("<li>" + userName + ": " + detail + "</li>");
      };

     chat.client.addUserIn = function(groupId, userName) {
        $("#contentMsg").append("<li>" + userName + "进入"+groupId+"号聊天室！</li>");
      };
      $.connection.hub.logging = true; //启动signalr状态功能
      $.connection.hub.start().done(function() {
        //加入聊天室 
        $("#joinRoom").click(function() {
          var groupId = $("#groupId").val();
          var userName = $("#userName").val();
          chat.server.addToRoom(groupId, userName);
        });
        //发送消息
        $("#send").click(function() {
          var detail = $("#message").val();
          var groupId = $("#groupId").val();
          var userName = $("#userName").val();
          chat.server.send(groupId, detail, userName);
        });
      });