Invalid URI: The format of the URI could not be determined - C#

Question

Im trying to set the source of a resource dictionary in c# to a location of a folder within the project, but get the above error.

Could someone advise what the issue

Answer 1

I kept running into the same issue even after passing the UriKind.Relative argument. The weird bit was that some of the Uris to XAML pages were working using the method @Magnus suggested - but most of them would throw the:

The format of the URI could not be determined

exception.

Finally, I read up on Pack Uris for WPF applications which solved my problem a 100%.

I started using urls like this:

// ResourceFile is in the Root of the Application
myResourceDictionary.Source = 
    new Uri("pack://application:,,,/ResourceFile.xaml", UriKind.RelativeOrAbsolute);

or

// ResourceFile is in the Subfolder of the Application
myResourceDictionary.Source = 
    new Uri("pack://application:,,,/SubFolder/ResourceFile.xaml", UriKind.RelativeOrAbsolute);

Hope this helps someone struggling with the same issues I was facing.

Answer 2

I was trying to set the background of a window to an ImageBrush.

Changing UriKind.Absolute to UriKind.Relative fixed the problem for me.

private void SetBackgroundImage()
{
    ImageBrush myBrush = new ImageBrush
    {
        ImageSource =
        new BitmapImage(new Uri("background.jpg", UriKind.Relative))
    };
    this.Background = myBrush;
}

Answer 3

You have to use UriKind.Relative

myResourceDictionary.Source = new Uri("../Resources/Styles/Shared.xaml",  UriKind.Relative);