foreach (StorageFile file in files)
{
if (file.Name.StartsWith(LockscreenManager.OriginalFilenamePrefix, StringComparison.OrdinalIgnoreCase))
{
await file.DeleteAsync();
}
}
The odd thing was, this error didn't occur all of the time and didn't have any clues as to why it did happen when it did.
I was stumped.
So I honed my Google-fu and managed to stumble upon a MS forum post which sounded a lot like mine.
It turns out, that when you reference a local file via the Image control in xaml, a lock is put on the file.
<Image source="Path/To/Local/File" />
This lock doesn't even seem to be taken off for while after navigating away from the page that includes said Image control.
The result - an UnauthorizedAccessException when attempting to delete the local file.
My solution to this problem is to use a converter to create the Source for the Image control by getting the file stream and loading it into a BitmapImage.
public class ImageSourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string language)
{
string path = value as string;
if (String.IsNullOrEmpty(path) == false)
{
var storageFile = StorageFile.GetFileFromPathAsync(path).AsTask().Result;
var imageStream = storageFile.OpenStreamForReadAsync().Result;
BitmapImage imgSource = new BitmapImage();
imgSource.SetSource(imageStream.AsRandomAccessStream());
return imgSource;
}
return null;
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
throw new NotImplementedException();
}
}
