UnauthorizedAccessException: SelectedDateChanged in CalendarControl can't call MessageDialog.ShowAsync()?

Hi, I test my code below with the 20130325 nightly build.

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();        
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        calendar.SelectedDateChanged += calendar_SelectedDateChanged;
    }


    void calendar_SelectedDateChanged(object sender, EventArgs e)
    {
        var calendarControl = sender as CalendarControl;
        var selectedDate = calendar.SelectedDate.ToString("D");

        var dialog = new MessageDialog(selectedDate);
        dialog.ShowAsync();
    }
}

However, once I click a date, so the SelectedDateChanged is fired, I got the UnauthorizedAccessException error below.

System.UnauthorizedAccessException was unhandled by user code HResult=-2147024891 Message=Access is denied. (Exception from HRESULT: 0x80070005 (EACCESSDENIED)) Source=Windows.UI StackTrace: at Windows.UI.Popups.MessageDialog.ShowAsync() at MindscapeCalendar.MainPage.calendarSelectedDateChanged(Object sender, EventArgs e)

I tried to wrap the dialog.ShowAsync with Dispatcher.RunAsync(), but it didn't help either.

Do you have any idea? Thanks, Karlkim

Hello Kimsk

This exception is caused when trying to open a MessageDialog when another MessageDialog is already being displayed. There was a bug in the CalendarControl that caused the SelectedDateChanged event to be raised twice for a single date change - hence your code tried to display 2 MessageDialogs. This bug has been resolved and the fix is available in the current nightly build. You can download the latest nightly build from your account page: http://www.mindscapehq.com/store/myaccount

Thanks for bringing this to our attention.

Jason Fauchelle

Thanks. I just tried the nightly build, and it works great now!