iot/projects/Infrastructure/Web/SignalR/PageHub.cs

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

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

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

        public Task Send(string group, string method, string message)
        {
            Console.WriteLine($"PageHub>Send {message} To {group}.{message}");
            return Clients.Group(group).SendAsync(method, message);
        }
    }
}