为什么PCL项目中的DLL是x86程序集？

Question

I have a C# project in Visual Studio 2012 that is a PCL, targeting these platforms (I removed the names):

When I try to add the dll, from a successful build, to a Silverlight 5 project in VS2013, I am getting this warning and it doesn't seem to actually be added:

Warning 1 There was a mismatch between the processor architecture of the project being built "MSIL" and the processor architecture of the reference "[Name]", "x86". This mismatch may cause runtime failures. Please consider changing the targeted processor architecture of your project through the Configuration Manager so as to align the processor architectures between your project and references, or take a dependency on references with a processor architecture that matches the targeted processor architecture of your project.

Why would a PCL be showing as x86?

Answer 1

When you have a PCL project for multiple targets and you want to referene the output .dll in other projects, be sure that you pick the right .dll with the right compilation.

For example:

• you have a Business project that is PCL for WP 8 and SL 5.
• you have 2 projects that reference the dll from the above business project
  • SL proj
  • WP 8 proj

In the WindowsPhone proj When you go to add reference you should pick the one that was compiled for ARM [note that if you want to run on the emulator you should pick the x86 version, because the emulator is not ARM]. If you add the x86 version and in the configuration manager you set it to ARM, Visual Studio will warn you with that same error that you have, because you will run a ARM code and have a x86 code referenced.

Check if the .dll that you add match with the configuration manager. Change it for the right architecture that you want instead of "Multiple platforms" vs "Any CPU"