4

This line 

StorageFile photo = await cameraUI.CaptureFileAsync(CameraCaptureUIMode.Photo);

gives me this error:

Error CS0012
The type 'IAsyncOperation<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'Windows.Foundation.FoundationContract, Version=3.0.0.0, Culture=neutral,

How to fix it?

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8
  • Perhaps you need to add a reference to "Windows.Foundation.FoundationContract" library, which was explained here: stackoverflow.com/a/50959930/4329813 Commented Mar 30, 2019 at 8:49
  • 1
    Look at the Important notice here Commented Apr 3, 2019 at 7:31
  • @jsanalytics Thanks, man. Good catch! Anyway I am wondering to use async/await in this type of DLL. Is it possible at all? Commented Apr 3, 2019 at 8:20
  • AcademyofProgrammer the async and await keyword is actually a compiler service. Therefore, it requires the platform support. You can see this for more details stackoverflow.com/a/12600602/744343 As @jsanalytics mentioned, for new development, you should do the .NET Standard instead of PCL Commented Apr 4, 2019 at 1:39
  • @jsanalytics I cannot incapsulate CameraCaptureUI into .NET Standart DLL to use in WPF project. That is the issue. Any clue how to do it? Commented Apr 4, 2019 at 4:54
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