Windows 10设备上的System.ExecutionEngineException

Question

I am developing a Windows Phone 8.1 app. It works fine on WP 8 and WP 8.1 devices, but on the device with Windows 10 it throws

ExecutionEngineException was unhandled. An unhandled exception of type 'System.ExecutionEngineException' occurred in Unknown Module.

in various sections in both "Debug" and "Release" without any data about what went wrong. There are some places, where the exception is always thrown and some, where it's thrown from time to time. Example code below throws the exception - it is basically a method to switch between tabs, which are StackPanels when the button (Grid with Image) is tapped:

private void Grid_Tapped(object sender, TappedRoutedEventArgs e)
{
    if(!isMapVisible)
    {
        hideSection();
        map_wrapper.Visibility = Windows.UI.Xaml.Visibility.Visible;
        map_button.Background = new SolidColorBrush(ColorHelper.FromArgb(0xFF, 40, 110, 73));
        map_icon.Source = new BitmapImage(new Uri(FileHelper.getIconPath("tu_2.png")));
        isMapVisible = true;
    }
}

private void hideSection()
{
    if(isMapVisible)
    {
        map_button.Background = new SolidColorBrush(ColorHelper.FromArgb(0xFF, 238, 238, 238));
        map_icon.Source = new BitmapImage(new Uri(FileHelper.getIconPath("tu.png")));
        isMapVisible = false;
        map_wrapper.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
    }
    else if(isPhotoVisible)
    {
        photo_button.Background = new SolidColorBrush(ColorHelper.FromArgb(0xFF, 238, 238, 238));
        photo_icon.Source = new BitmapImage(new Uri(FileHelper.getIconPath("photo_green.png")));
        isPhotoVisible = false;
        image_wrapper.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
    }
    else if(isListVisible)
    {
        list_button.Background = new SolidColorBrush(ColorHelper.FromArgb(0xFF, 238, 238, 238));
        list_icon.Source = new BitmapImage(new Uri(FileHelper.getIconPath("!2.png")));
        isListVisible = false;
        news_wrapper.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
    }
}

Answer 1

Finally I managed to fix the code. However the error wasn't in the code above. I used something called "Safe Navigation". The example is shown in the code below:

Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
    rootFrame.Navigate(typeof(MainPage));
});

I also handled all asynchronous methods with await operator (I had left some of them before to run asynchronously). One of those improvements fixed the error.

Answer 2

I know this comes over two years beyond the original post, but maybe this will help someone looking for an answer to this question. I kept getting apparently random System.ExecutionEngineExceptions from a Window 10 UWP desktop app. After several days, I found the answer for my particular problem. I had used a MVVM platform, and the x:UID in one of my views had become corrupted.

IT SHOULD HAVE BEEN: <TextBlock x:Uid="Battery ...

IT WAS: <TextBlock x:Uid="=Battery"

The error was not flagged as a XAML problem, as many syntax errors similar to this are but once I corrected that error, by removing the unneeded equal sign, the exception went away.

Hope this helps someone else.

Clyde

Answer 3

Also want to add to the above. The XAML engine does not check for duplicate x:Uid and I also got this error when I had two x:Uid's with the same name. Made all x:Uid's throughout my project unique (unfortunately expands the resource file) but that resolved any further issues. Wished that the XAML designer checked for duplicate x:Uid's the was it does for x:Name's.

Again, hope it helps someone in the future.

Cheers,

Clyde