AssemblyPatcher

An MSBuild task that modifies existing assemblies to add InternalsVisibleTo attributes, remove sealed modifiers, or add virtual keywords.

Usage

Add the NuGet package to your project:

<PackageReference Include="AssemblyPatcher">
   <PrivateAssets>all</PrivateAssets>
   <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>

Add an InternalsVisibleTo attribute to SomeAssembly with OwnAssembly as the assembly name:

<ItemGroup>
   <AddInternalsVisibleTo Include="SomeAssembly" AssemblyName="OwnAssembly" />
</ItemGroup>

Remove sealed modifiers from types in SomeAssembly:

<ItemGroup>
   <RemoveSealedFrom Include="SomeAssembly" />
   <!-- or filtered -->
   <RemoveSealedFrom Include="SomeAssembly" TypeNames="SomeAssembly.TypeA;SomeAssembly.Folder.*" />
</ItemGroup>

Add virtual keywords in SomeAssembly:

<ItemGroup>
   <AddVirtualTo Include="SomeAssembly" />
   <!-- or filtered -->
   <AddVirtualTo Include="SomeAssembly" MemberNames="SomeAssembly.TypeA;SomeAssembly.Types::Member*" />
</ItemGroup>

License

MIT