ConditionalSymbols.props

<Project>
  <PropertyGroup Label="Compile Options">
    <!-- true to include all conditional paths / attributes, mainly for testing -->
    <SM_IncludeAllConditionals>false</SM_IncludeAllConditionals>
    <!-- Mode for ServiceProvider registrations: CodeGeneration, Reflection -->
    <SM_RegisterServiceMode>CodeGeneration</SM_RegisterServiceMode>
  </PropertyGroup>
  
  <PropertyGroup Condition="'$(SM_IncludeAllConditionals)' == 'true'">
    <!-- REGISTER_SERVICE_USAGES: Include Injectio attributes -->
    <DefineConstants>$(DefineConstants);REGISTER_SERVICE_USAGES</DefineConstants>
  </PropertyGroup>

  <PropertyGroup Label="RegisterServiceMode Definitions">
    <DefineConstants Condition="'$(SM_RegisterServiceMode)' == 'Reflection'">
      $(DefineConstants);REGISTER_SERVICE_REFLECTION;REGISTER_SERVICE_USAGES
    </DefineConstants>
  </PropertyGroup>
</Project>