How to set FallbackValue in binding as path to external image file?

Question

I\'m trying to set FallbackValue in case when my converter cannot be call, but I\'m not sure how to do that.

Answer 1

For myself, I created the following example:

    
    

    
    pack://application:,,,/NotFound.png

    
    pack://application:,,,/NullImage.png




    

    

The path to the images, I announced in resources. Images are stored in the root of the project. Listing of MyTestData:

public class TestDataForImage : DependencyObject
{
    public string NotFoundString
    {
        get
        {
            return (string)GetValue(NotFoundStringProperty);
        }

        set
        {
            SetValue(NotFoundStringProperty, value);
        }
    }

    public static readonly DependencyProperty NotFoundStringProperty = DependencyProperty.Register("NotFoundString", typeof(string), typeof(TestDataForImage), new PropertyMetadata(""));

    public string NullString
    {
        get
        {
            return (string)GetValue(NullStringProperty);
        }

        set
        {
            SetValue(NullStringProperty, value);
        }
    }

    public static readonly DependencyProperty NullStringProperty = DependencyProperty.Register("NullString", typeof(string), typeof(TestDataForImage), new PropertyMetadata(""));

    public TestDataForImage()
    {
        NotFoundString = "pack://application:,,,/NotExistingImage.png";
        NullString = null;
    }
}