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Editorial Team
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Asked: 2026-05-13T18:52:25+00:00

I have problem with loading resources for UserControl from referenced assembly in Expression Blend

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I have problem with loading resources for UserControl from referenced assembly in Expression Blend

Here is the relevant code:

<UserControl.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/Referenced.Assembly;component/Resources/ResourceDictionary.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</UserControl.Resources>

I also tried this URI variant:

<ResourceDictionary Source="/Referenced.Assembly;Component/Resources/ResourceDictionary.xaml"/>

In Visual Studio 2008 SP1 (both code and designer) everything works fine and application is using specified resources. When loading solution and opening UserControl XAML file in Expression Blend 3, it says “Specified file not found” (or sth like that, I have localized version of .NET Framework) no other information, no exceptions are thrown while debugging Blend process in Visual Studio.

Any ideas?

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1 Answer

  1. Editorial Team

    OK, after some digging I found the problem. I you’ll ever have this problem, remember to add this code to your .csproj file:

    <ProjectTypeGuids>
  {60dc8134-eba5-43b8-bcc9-bb4bc16c2548};
  {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
</ProjectTypeGuids>

    Even easier solution of this problem is to create new project and choose template WPF Custom Control Library instead of Class Library.

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