iot/labs/IoTServices/SingalDemo/PageHub.cs

using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.AspNetCore.SignalR;

namespace SingalDemo
{
    public class PageHub : Hub
    {
        public override Task OnConnectedAsync()
        {
            Console.WriteLine($"{Context.ConnectionId} has connected which request url is {Context.GetHttpContext().Request.GetEncodedUrl()}");
            if (Context.GetHttpContext().Request.Query.Keys.Contains("group"))
            {
                this.Groups.AddToGroupAsync(Context.ConnectionId, Context.GetHttpContext().Request.Query["group"]);
            }
            return base.OnConnectedAsync();
        }

        public override Task OnDisconnectedAsync(Exception exception)
        {
            Console.WriteLine($"{Context.ConnectionId} has disconnected which request url is {Context.GetHttpContext().Request.GetEncodedUrl()}");
            return base.OnDisconnectedAsync(exception);
        }
    }
}