public async Task Connect(int topicId)
{
await Groups.AddToGroupAsync(Context.ConnectionId, topicId.ToString());
try
{
var userId = Context.User.Identity.IsAuthenticated ? Context.User.Identity.GetUserId() : null;
await _topicService.AddView(userId, topicId);
}
catch
{
await Groups.RemoveFromGroupAsync(Context.ConnectionId, topicId.ToString());
}
}