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Windows Phone 7.1 - System.Windows.Interactivity assembly not found.

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Wolfgang Ziegler

04 Aug, 2014 01:20 PM

I am trying to build a Windows Phone 7.1 Silverlight Project, which references the "System.Windows.Interactivity" assembly.
This results in a build error:

warning MSB3245: Could not resolve this reference. Could not locate the assembly "System.Windows.Interactivity, Version=3.8.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL". Check to make sure the assembly exists on disk.

error CS0234: The type or namespace name 'Interactivity' does not exist in the namespace 'System.Windows' (are you missing an assembly reference?)

Building the project for Windows Phone 8 (other version of the Interactivity assembly) work. Any ideas?

1. Support Staff 1 Posted by Feodor Fitsner on 04 Aug, 2014 01:42 PM

   

   Hi Wolfgang,

   Phone 7.1 project is in Silverlight 4, right?

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2. Support Staff 2 Posted by Feodor Fitsner on 04 Aug, 2014 01:54 PM

   

   OK, found it. The v3.8.5 of this assembly is a part of Windows Phone SDK 7.1 and its location on build worker is C:\Program Files (x86)\Microsoft SDKs\Expression\Blend\Windows Phone\v7.1\Libraries\System.Windows.Interactivity.dll

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3. 3 Posted by Wolfgang Ziegle... on 04 Aug, 2014 01:54 PM

   

   Hi Feodor,

    

   Yes it’s Silverlight 4.

    

   Thanks for the quick reply!
   -Wolfgang

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4. 4 Posted by Wolfgang Ziegle... on 04 Aug, 2014 02:01 PM

   

   That’s the same path as on my local machine. Not sure why it doesn’t work then …

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5. 5 Posted by Wolfgang Ziegle... on 05 Aug, 2014 08:09 AM

   

   I was able to resolve this issue using a <HintPath> for my <Reference> to System.Windows.Ineractivity.

       <Reference Include="System.Windows.Interactivity, Version=3.8.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
         <HintPath>$(MSBuildProgramFiles32)\Microsoft SDKs\Expression\Blend\Windows Phone\v7.1\Libraries\System.Windows.Interactivity.dll</HintPath>
       </Reference>

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6. Support Staff 6 Posted by Feodor Fitsner on 05 Aug, 2014 08:10 AM

   

   Great, thanks for the update!

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7. Ilya Finkelshteyn closed this discussion on 25 Aug, 2018 01:46 AM.