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Resources
Referencing Resources from an Assembly
In XAML, to reference an image in images/icons/icon-product-acme1.png in assembly Acme.Products.Specifications.dll, you need to use the pack notation (for package).
Local Assembly (no pack notation required):
<Image Source="/images/icons/icon-product-acme1.png" Width="35" Height="35" Margin="5" />
Referenced Assembly:
<Image Source="pack://application:,,,/Acme.Products.Specifications;component/images/icons/icon-product-acme1.png" Width="35" Height="35" Margin="5" />
NOTE: Make sure the image file is compiled as Resource (not Embedded Resource or Content) in the assembly.