[Spec] Transitive Warning Properties

Current Status

As per the work done in restore warnings and errors users now experience NuGet warnings and errors as first class warnings and errors. Further, the work done in and warning properties support we allow users to add the following 3 msbuild properties to control this experience -

• TreatWarningsAsErrors - This accepts true/false and can be used to treat all warnings as errors including NuGet/Msbuild/CSC.

  <TreatWarningsAsErrors>True</TreatWarningsAsErrors>

• WarningsAsErrors - This accepts a comma or semi-colon separated list of NuGet warning codes and can be used to convert specific warnings to errors.

  <WarningsAsErrors>$(WarningsAsErrors);NU1603;NU1701</WarningsAsErrors>

• NoWarn - This accepts a comma or semi-colon separated list of NuGet warning codes and can be used to hide specific warnings.

  <NoWarn>$(NoWarn);NU1603;NU1605</NoWarn>

• Package Specific NoWarn - This accepts a comma or semi-colon separated list of NuGet warning codes and can be used to hide specific warnings for a specific package reference. This property has to be set on a package reference.

  <PackageReference Include="NuGet.Versioning" Version="4.1.5" NoWarn="NU1603" />
  or
  

  <PackageReference Include="NuGet.Versioning" Version="4.1.5">
    <NoWarn>NU1603</NoWarn>
  </PackageReference>
  

Combined Example -

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp1.1;net46</TargetFramework>
    <NoWarn>$(NoWarn);NU1603;NU1605</NoWarn>
    <WarningsAsErrors>NU1603;NU1701</WarningsAsErrors>
    <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="NuGet.Versioning" Version="4.1.5" NoWarn="NU1603" />
  </ItemGroup>
</Project>

Problem

Based on the work done above, we allow customers to control the warnings generated in one project. But currently we do not allow customers