public override async Task OnConnectedAsync()
{
var userId = Guid.Parse(Context.User.Claims.Single(x => x.Type == "UserId").Value);
var connectionId = Context.ConnectionId;
_onlineUsers.MapChatHubConnection(userId, connectionId);
if (_onlineUsers.CountChatHubConnections(userId) == 1)
{
await Clients.All.SendAsync("ChatUserConnected", _onlineUsers.GetUser(userId));
}
await base.OnConnectedAsync();
}
