Precompiled Views and CompilationCallback - asp.net

Question

I've defined a compilation callback for my MVC views like
var mvc = services.AddMvc();
mvc.AddRazorOptions(razorSetup => {
razorSetup.CompilationCallback = context => {
// context.Compilation = context.Compilation.AddReferences(...)
};
});
This works great - and while debugging, there's no problem - but when the build-tools are precompiling the views (and as of asp.net core 2, precompiling is the default behavior), the compilation callback is just not used anymore.
While this makes perfect sense to me (after a bit of struggling), I wan't to know how/where I can configure the precompilation task.

Answer 1

I finally found a solution...
.net core 2
In .net core 2 you can add a --configure-compilation-type=-Option to the respone file used during compilation. The value should be a fully qualified type that implements Microsoft.AspNetCore.Mvc.IDesignTimeMvcBuilderConfiguration (not sure if it's necessarry or if it's sufficient to have a Configure-method here)
Adding can be done via
<Target Name="_AddMvzRazorPrecompileOptions" AfterTargets="_CreateResponseFileForMvcRazorPrecompile">
<Error Condition="!Exists($(_MvcRazorResponseFilePath))" Text="File $(_MvcRazorResponseFilePath) does not exist" />
<ItemGroup>
<_Option Include="--configure-compilation-type=KlugeSoftware.Web.ViewTranslator.PrecompileFactory, KlugeSoftware.Web.ViewTranslator" />
</ItemGroup>
<WriteLinesToFile File="$(_MvcRazorResponseFilePath)" Lines="#(_Option)" Overwrite="false" />
</Target>
.net core 3
Not that easy (at least I didn't find anything so far). But you can use a similar way to get your code between razor generation (creation of *.g.cs - files) and compiling them.
<Target Name="_DoSomethingSpecial" AfterTargets="PrepareForRazorCompile" BeforeTargets="RazorCoreCompile">
<!-- ... -->
</Target>
At this point, you can use a custom msbuild task to inspect or modify the generated code (and/or the source code).
Source files are stored in #(RazorCompile), dependencies in #(RazorReferencePath)....