When I turned my project referencing to PCL assembly to .NET 4.5.2, I got compiler error: "The type 'System.Windows.Input.ICommand' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'." There are many such questions, but no one is not solve my problem.

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Eugene On BEST ANSWER
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user3918598 On

The System.Runtime dll file is distributed as part of Windows 8 SDK.

Here's the installation link: http://msdn.microsoft.com/en-us/windows/desktop/hh852363.aspx