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

namespace GZCCC.API.SignalRLibs
{
    [HubName("NotifyHub")]
    public class NotifyHub : Hub
    {
        public override Task OnConnected()
        {
            return base.OnConnected();
        }

        ////用户进入页面时执行的（连接操作）
        //public void controllerConnected(string UserID)
        //{
        //    UserHandler.Users.Add(Context.ConnectionId, UserID);
        //}


        //发送信息给特定人
        public void sendMessage(string Message)
        {
            Clients.All.sendMessage(Message);
            //var lst = UserHandler.Users.Where(p => p.Value == toUserID).ToArray();
            //foreach (var Client in lst)
            //{
            //    Clients.Client(Client.Key).sendMessage(Message);
            //}

        }

        public override Task OnDisconnected(bool stopCalled)
        {
            Clients.All.removeList(Context.ConnectionId);
            return base.OnDisconnected(stopCalled);
        }
        ////当使用者断线时执行
        //public override Task OnDisconnected(bool stopCalled)
        //{
        //    //当使用者离开时，移除在清单内的ConnectionId

        //    Clients.All.removeList(Context.ConnectionId);
        //    //UserHandler.Users.Remove(Context.ConnectionId);
        //    //return base.OnDisconnected(stopCalled);
        //}
    }
    //声明静态变量存储当前在线用户
    public static class UserHandler
    {
        public static Dictionary<string, string> Users = new Dictionary<string, string>();
    }
}

using System;
using System.Threading.Tasks;
using System.Web.Http;
using Microsoft.Owin;
using Owin;
using Microsoft.AspNet.SignalR;
using Microsoft.AspNet.SignalR.Hubs;
using Microsoft.Owin.Cors;

[assembly: OwinStartup(typeof(GZCCC.API.SignalRLibs.Startup))]

namespace GZCCC.API.SignalRLibs
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
           
            // 有关如何配置应用程序的详细信息，请访问 https://go.microsoft.com/fwlink/?LinkID=316888
            //app.MapSignalR();

            app.Map("/signalr", map =>
            {
                // Setup the CORS middleware to run before SignalR.
                // By default this will allow all origins. You can 
                // configure the set of origins and/or http verbs by
                // providing a cors options with a different policy.
                
                map.UseCors(CorsOptions.AllowAll);
                var hubConfiguration = new HubConfiguration
                {
                    // You can enable JSONP by uncommenting line below.
                    // JSONP requests are insecure but some older browsers (and some
                    // versions of IE) require JSONP to work cross domain
                    // EnableJSONP = true
                };
                // Run the SignalR pipeline. We're not using MapSignalR
                // since this branch already runs under the "/signalr"
                // path.
                map.RunSignalR(hubConfiguration);
            });


        }

    }
}

npm i -D -S signalr-no-jquery