问题
I absolutely need an extern alias for System.Core in my project. Unfortunately, in a .Net 4.0 project, you cannot even add a reference to System.Core because, apparently, the build system includes it by default. Does anyone have any idea on how I can coerce the system to let me specify an extern alias for this lib? Thanks!
回答1:
This question is old but I ran into the same problem. As far as I understood, this is due to Visual Studio implicitly adding a reference to System.Core.
You can override this by editing your csproj msbuild file and adding:
<PropertyGroup>
<AdditionalExplicitAssemblyReferences/>
</PropertyGroup>
at the end.
This disables any AdditionalExplicitAssemblyReferences that I assume Visual Studio has passed to MSBuild using the /p[roperty] switch.
Of course, we now still have to add the System.Core reference as it is no longer referenced. Do so by adding
<Reference Include="System.Core">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
<Aliases>global,ActualSystemCore</Aliases>
</Reference>
to the ItemGroup that contains references (or a new one).
You can now refer to a System.Core type using
ActualSystemCore::System....
来源：https://stackoverflow.com/questions/2643412/how-to-create-an-extern-alias-for-system-core