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Asked: 2026-06-18T00:17:09+00:00

I have C#/WPF that has a persistent problem loading/resolving the System.Windows.Interactivity I am using

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I have C#/WPF that has a persistent problem loading/resolving the System.Windows.Interactivity
I am using Visual Studio 2010 as my editor and already installed Blend 4 + Blend 4 SDK,

……

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity">

Why still return result Assembly was not found? Like my class library CustomBehaviorLibrary was missing?

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  1. Editorial Team

    If it worked at runtime but not design-time then I am blaming VS 2010 for being buggy. I’ve had VS 2010 not recognize the local namespace when imported into XAML, but when opened in VS 2012 it worked in the designer with no problems. Unfortunately, Visual Studio 2010’s XAML/WPF support is far from perfect. Expression Blend or Visual Studio 2012 are better.

    I did like ViktorLaCroix ‘s suggestion. I would try 

    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

    Instead of importing it using clr-namespace and see if that helps you. That’s how I am using it and it works fine. I’ll also show you my reference details for the library.

    System.Windows.Interactivity
C:\Program Files (x86)\Microsoft SDKs\Expression\Blend\.NETFramework\v4.0\Libraries\System.Windows.Interactivity.dll
v4.0.30319
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