You don't need to specify each file that you want to link, add <Compile Include="..\**\*.cs" Link="%(RecursiveDir)%(FileName)"/>
to your project file to link all files in the other project
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You don't need to specify each file that you want to link, add
<Compile Include="..\**\*.cs" Link="%(RecursiveDir)%(FileName)"/>to your project file to link all files in the other project