public async void AddConUserList(string user, string groupName) { var _user = new SignalRUser(); _user.UserName = user; _user.ConnectID = Context.ConnectionId; _user.OnlineTime = DateTime.Now; _user.GroupName = groupName; await Groups.AddToGroupAsync(Context.ConnectionId, groupName); await Clients.Group(groupName).SendAsync("GetConList", conUserList.AddList(_user)); }