Displaying Images in C#/WPF from resources.resx

Question

I want something simple - display an image in WPF, both from XAML and from Code-Behind.

My raw materials are .png, .bmp, and sometimes .gif.

Until now I loaded them in many different ways, for example:

<Image Source="../../Resources/Images/close_btn.png"></Image>

and

MyImage = new BitmapImage(new Uri($"pack://application:,,,/Resources/Images/file.png"));

but now I want to put everything in resources.resx, and load it from there. But here's the problem. Image Source = requires a string, not a resourced image. Same for BitmapImage - it requires a Uri, and not the actual resource.

Is there a simple way to display the images? (i.e. not use converters, streams etc.)