public async Task AddToChat(string chatId)
{
try {
var userInfo = await _distributedCache.GetObjectAsync <User>(Context.ConnectionId);
var userChatInfo = _hubService.FindUserInChat(userInfo.AppId, chatId, userInfo.Id);
if (userChatInfo != null)
{
await Groups.AddToGroupAsync(Context.ConnectionId, chatId);
}
} catch {
}
}