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DllNotFoundException: Unable to load DLL...when debug with hololens device.

I create a simple demo just for testing DllImport. The dll is a ''Dll (Universal Windows)'', it just output a number. And i invoke the dll by DllImport in the hololens project. but i always get the error "DllNotFoundException: Unable to load DLL...". And this is my structure.
can someone help me?
Think you!

Best Answer


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    Also, if you had already built your app previous to adding the DLL into your hierarchy, you may need to delete your folder that you build to (commonly App, but not always). Then when you create a build it will get added into the visual studio project correctly. You also need to do this if you make a change to the DLL and copy the new version of the file in.

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    Thank you for answer.
    My settings is the same with @Jimbohalo10 .But my exception is not the result of this. it's because my environment of computer, i have installed 2 version(17/15) of vs. It's good when i debug the same code in other clean computer that just installed vs2015.
    Anyway, thanks .

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