Hafner.Compatibility.GuidAttribute

This micro repository has the sole purpose to provide class System.Runtime.InteropServices.GuidAttribute for frameworks that do not include it, namely .NET Standard 1.0.

For all the other supported frameworks the assembly is only an empty shell.

Multi-Targeting Project Structure

This multi-targeting project uses the following structure to represent the 4 different kind of source files (empty folders are omitted):

Source File Kind	Subfolder	Description	Project Included
Full Types Framework Agnostic	\	Normal types that are identical for all supported frameworks.	always
Full Types Framework Specific	\SpecificFrameworks	Normal types that are only needed in a subset of the supported frameworks.	only certain frameworks
Partial Types Framework Agnostic	\PartialTypes	Partial classes/interfaces that contain the common code that is idential for all the supported frameworks.	always
Partial Types Framework Specific	\SpecificFrameworks\PartialTypes	Partial classes/interfaces that contain the framework specific implementations for a subset of the supported frameworks.	only certain frameworks

The framework specific folders are excluded from normal build in the project file (*.csproj) and only included for the according target frameworks.

Here a sample of the relevant elements in the project file (*.csproj):

<PropertyGroup>
  <FrameworksLackingGuidAttribute>|netstandard1.0|</FrameworksLackingGuidAttribute>
</PropertyGroup>
<ItemGroup>
  <Compile Remove="SpecificFrameworks\**\*.cs" />
  <None Include="SpecificFrameworks\**\*.cs" />
</ItemGroup>
<ItemGroup Condition="$(FrameworksLackingGuidAttribute.Contains('|$(TargetFramework)|'))">
  <None Remove="SpecificFrameworks\**\*.cs" />
  <Compile Include="SpecificFrameworks\**\*.cs" />
</ItemGroup>