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 is please?

Heres the code:

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

Please let me know if you need anymore information.

Answer 1

You have to use UriKind.Relative

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

Answer 2

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.