I really got annoyed today by the fact that I could not perform a simple task of setting the Icon property of my WPF window
from codebehind. I tried using the following code:

 BitmapImagebmp = newBitmapImage(newUri(@"pack://application:,,/Resources/OptionsDialog.ico")); this.Icon = bmp; 

This kept throwing an exception saying “System.InvalidOperationException: ImageSource for Icon property must be an icon file.”
Well, OptionsDialog.ico is an icon, and I couldn’t find anywhere in the documentation (or in Google) a different way of setting an ImageSource property.
Luckily, it turns out the MSDN WPF forum is a good place to ask questions and it didn’t take long to get an answer (from Ashish Shetty) on how this should be done:

 IconBitmapDecoder ibd = new IconBitmapDecoder( new Uri(@"pack://application:,,/Resources/OptionsDialog.ico", UriKind.RelativeOrAbsolute), BitmapCreateOptions.None, BitmapCacheOption.Default); this.Icon = ibd.Frames[0]; 

This snippet should be in the Window.Icon property documentation….

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