private async void NextStep_Click(object sender, RoutedEventArgs args) { /** * handle checking account process HERE. * * 1.check the textbox NotNull */ var txtAcc = txtBoxAcc.Text; if (txtAcc == null || txtAcc == "") { return; } var isPhoneNum = RegexTool.IsMobilePhone(txtAcc); System.Diagnostics.Debug.WriteLine(txtAcc); System.Diagnostics.Debug.WriteLine(isPhoneNum); if (!RegexTool.IsMobilePhone(txtAcc)) { await new ContentDialog() { Title = "这个手机号无效", CloseButtonText = "确认", DefaultButton = ContentDialogButton.Close }.ShowAsync(); return; } PlayAccGotoPass(); }