Continued from previous post...

 

 

Example for server-side implementation:

using Microsoft.AspNet.SignalR;

using Microsoft.AspNet.SignalR.Hubs;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using System.Web;

 

namespace SignalR.EditFile

{

     

    public static class UserHandler //this static class is to store the number of  users conected at the same time

    {

        public static HashSet<string> ConnectedIds = new HashSet<string>();

    }

 

    [HubName("editFile")]   //this is for use a name to use in the client

    public class EditFileHub : Hub

    {

        public void editFile(int x, int y) // this method will be called from the client, when the user edits a file

        {    

            Clients.Others.fileEdited(x, y); // this method will send the coord x, y  to the other users but the user draging the shape

        }

 

        public override Task OnConnected() //override OnConnect, OnReconnected and OnDisconnected  to know if a user is connected or disconnected

        {

            UserHandler.ConnectedIds.Add(Context.ConnectionId); //add a connection id to the list

            Clients.All.usersConnected(UserHandler.ConnectedIds.Count()); //this will send to ALL the clients  the number of users connected

             return base.OnConnected();

        }

 

        public override Task OnReconnected()

        {

            UserHandler.ConnectedIds.Add(Context.ConnectionId);

            Clients.All.usersConnected(UserHandler.ConnectedIds.Count());

            return base.OnConnected();

        }

 

        public override Task OnDisconnected()

        {

            UserHandler.ConnectedIds.Remove(Context.ConnectionId);

            Clients.All.usersConnected(UserHandler.ConnectedIds.Count());

            return base.OnDisconnected();

        }          

    }

}