Question

我的uwp应用程序中有一个数据透视控件。在pivot_selectionchanged事件中，我已写入显示消息对话框。

在我点击了枢轴项目后生成uwp应用程序包后，应该显示一些警告消息对话框，但是在那时应用程序崩溃时它没有显示。这仅适用于某些机器。任何人都可以知道原因吗？

我写的代码是

private void OpenBillPivot_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    bool Isreturn = false;
    bool IsExchange = false;

    Isreturn = checkUserPermission(Constants.Return);
    IsExchange = checkUserPermission(Constants.Exchange);
    if (Application.Current.Resources[Constants.RETURNS].ToString() == Constants.FALSE_CAMELCASE)
        Isreturn = false;
    else
        Isreturn = true;
    if (Application.Current.Resources[Constants.EXCHANGES].ToString() == Constants.FALSE_CAMELCASE)
        IsExchange = false;
    else
        Isreturn = true;

    if ((txtblStatus.Text == "Cancelled" || txtblStatus.Text=="Draft") && (OpenBillPivot.SelectedIndex == 1 || OpenBillPivot.SelectedIndex == 2 || OpenBillPivot.SelectedIndex == 3))
    {
        TransactionDetails.Visibility = Visibility.Collapsed;
        ReturnDetails.Visibility = Visibility.Collapsed;
        ExchangeDetails.Visibility = Visibility.Collapsed;
        //SimpleMessageDialog(ResourceLoader.GetForCurrentView().GetString("PLEASE_CLEAR_THE_BILL"), ResourceLoader.GetForCurrentView().GetString("ALERT"));
    }

    else if (OpenBillPivot.SelectedIndex == 2)
    {
        if ((txtblStatus.Text == "Pending" && txtblBillDue.Text != Constants.ZERO))
        {
            ReturnDetails.Visibility = Visibility.Collapsed;
            ExchangeDetails.Visibility = Visibility.Collapsed;
            SimpleMessageDialog(ResourceLoader.GetForCurrentView().GetString("PLEASE_CLEAR_THE_BILL"), ResourceLoader.GetForCurrentView().GetString("ALERT"));
        }

        else
        {
            if (!Isreturn)
            {
                ReturnDetails.Visibility = Visibility.Collapsed;
                SimpleMessageDialog("Access Denied", ResourceLoader.GetForCurrentView().GetString("ALERT"));
            }
            else
                ReturnDetails.Visibility = Visibility.Visible;
        }

    }

和消息对话代码：

private async void SimpleMessageDialog(string Message, string Title)
{
    MessageDialog dialog = new MessageDialog(Message, Title);
    dialog.CancelCommandIndex = 1;
    await dialog.ShowAsync();
}

Answer 1

可能是因为您实际上没有等待消息显示，将返回类型从void更改为Task：

private async Task SimpleMessageDialog(string Message, string Title)
{
    MessageDialog dialog = new MessageDialog(Message, Title);
    dialog.CancelCommandIndex = 1;
    await dialog.ShowAsync();
}

并等待它：

await SimpleMessageDialog(ResourceLoader.GetForCurrentView().GetString("PLEASE_CLEAR_THE_BILL"), ResourceLoader.GetForCurrentView().GetString("ALERT"));

您还需要将方法更改为异步：

private async void OpenBillPivot_SelectionChanged...

UWP应用程序崩溃而不是显示消息对话框

1 个答案: