public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (targetType != typeof(ImageSource))
{
throw new InvalidOperationException("CachedImageUrlValueConverter can only be used on ImageSource properties.");
}
if (value == null)
{
return(value);
}
if (!(value is CachedImage))
{
return(null);
}
CachedImage cachedImage = (CachedImage)value;
if (cachedImage.Access != null)
{
cachedImage.Access();
}
string url = cachedImage.ImageUrl;
if (url == null)
{
return(null);
}
if (!url.StartsWith("storage:"))
{
return(new BitmapImage(new Uri(url, UriKind.RelativeOrAbsolute)));
}
url = url.Substring("storage:".Length);
using (IsolatedStorageFileStream isoStream = _isoStore.OpenFile(url, FileMode.Open))
{
BitmapImage bmp = new BitmapImage();
bmp.SetSource(isoStream);
return(bmp);
}
}
