Trouble with custom MarkupExtension [modified]

chaiguy1337

I am annoyed at having to declare icons for a menu item as static resources and then reference those resources in my menu definition, so I came up with the idea of creating a MarkupExtension called ImageLoader that inputs a relative Source (and height and width properties) and returns a fully-instantiated Image object so I can reference these inline in my menu definition:

(Before I go any further, if you know of a better/easier way to do this, please tell me!) However, I'm running into an odd problem inside my MarkupExtension definition where when I pass the path into ImageSourceConverter.ConvertFrom(), it interprets it as a file path (of the default drive) rather than a resource path. I say it's odd because when I create an Image directly in XAML, I am passing the exact same string into its ImageSource attribute, and it works fine! So why is it interpreting it as a file when I do it manually?

[MarkupExtensionReturnType( typeof( Image ) )]
public class ImageLoaderExtension: MarkupExtension {

public Double Width { get; set; }
public Double Height { get; set; }

string imagePath;

public ImageLoaderExtension( string imagePath ) {
	this.imagePath = imagePath;
}

public override object ProvideValue( IServiceProvider serviceProvider ) {
	Image image = new Image();
	image.Source = (ImageSource)( new ImageSourceConverter().ConvertFrom( imagePath ) );
	image.Height = this.Height;
	image.Width = this.Width;
	return image;
}

}

Thanks for any input. -Logan

modified on Thursday, September 4, 2008 7:39 PM

Walt Dell · modified on Thursday, September 4, 2008 7:39 PM

The following may work for you (it assumes that you want a BitmapImage):

image.Source = new System.Windows.Media.Imaging.BitmapImage(new Uri(imagePath, UriKind.Relative));

-Walt