private async void CreateCircle(object sender, RoutedEventArgs arg) { var title = CircleTitle.Text; var desc = CircleDesc.Text; if (string.IsNullOrEmpty(title)) { PopupMessage.DisplayMessageInRes("CreateCircleError"); return; } var rst = await DataRequester.CreateCircle(title, desc); if (rst.Id < 1) { PopupMessage.DisplayMessage(rst.Error_Msg); return; } PopupMessage.DisplayMessageInRes("CreateCircleSuccess"); NavigationManager.Instance.GoBack(); }