Add InternalsVisibleTo to new csproj SDK format

README.md

InternalsVisibleTo in new csproj SDK format

Original source: https://www.meziantou.net/declaring-internalsvisibleto-in-the-csproj.htm

Directory.Build.targets

<Project>

  <Target Name="AddInternalsVisibleTo" BeforeTargets="CoreCompile">
    <!-- Add default suffix if there is no InternalsVisibleTo or InternalsVisibleToSuffix defined -->
    <ItemGroup Condition="@(InternalsVisibleToSuffix->Count()) == 0 AND @(InternalsVisibleTo->Count()) == 0">
      <InternalsVisibleToSuffix Include=".Tests" />
    </ItemGroup>

    <!-- Handle InternalsVisibleTo -->
    <ItemGroup Condition="'@(InternalsVisibleTo->Count())' &gt; 0">
      <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
        <_Parameter1>%(InternalsVisibleTo.Identity)</_Parameter1>
      </AssemblyAttribute>
    </ItemGroup>

    <!-- Handle InternalsVisibleToSuffix -->
    <ItemGroup Condition="@(InternalsVisibleToSuffix->Count()) &gt; 0">
      <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
        <_Parameter1>$(AssemblyName)%(InternalsVisibleToSuffix.Identity)</_Parameter1>
      </AssemblyAttribute>
    </ItemGroup>
  </Target>

</Project>

Example.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <LangVersion>8.0</LangVersion>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <InternalsVisibleTo Include="CustomTest1" /> <!-- [assembly: InternalsVisibleTo("CustomTest1")] -->
    <InternalsVisibleTo Include="CustomTest2, PublicKey=abc" /> <!-- [assembly: InternalsVisibleTo("CustomTest2, PublicKey=abc")] -->
    <InternalsVisibleTo Include="$(AssemblyName).Custom" /> <!-- [assembly: InternalsVisibleTo("ClassLibrary1.Custom")] -->

    <InternalsVisibleToSuffix Include=".Tests" /> <!-- [assembly: InternalsVisibleTo("ClassLibrary1.Tests")] -->
    <InternalsVisibleToSuffix Include=".FunctionalTests" /> <!-- [assembly: InternalsVisibleTo("ClassLibrary1.FunctionalTests")] -->
  </ItemGroup>

</Project>