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Proj0210: Define the project license explicitly

To ensure the creation of well-formed NuGet packages and for maximum compatibility with external tools, explicitly define the <PackageLicenseExpression> or <PackageLicenseFile> node. Alternatively disable package generation by defining the <IsPackable> node with value false.

The value of the <PackageLicenseExpression> tag must be a SPDX license identifier. A full list can be found on spdx.org.

Also see licenses.nuget.org.

Non-compliant

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <IsPackable>true</IsPackable>
  </PropertyGroup>

</Project>

Compliant

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <IsPackable>true</IsPackable>
    <PackageLicenseExpression>MIT</PackageLicenseExpression>
  </PropertyGroup>

</Project>

Or:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <IsPackable>true</IsPackable>
    <PackageLicenseFile>LICENSE.md</PackageLicenseFile>
  </PropertyGroup>

  <ItemGroup>
    <None Include="LICENSE.md" Pack="true" PackagePath="" />
  </ItemGroup>

</Project>

Or disable packability:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <IsPackable>false</IsPackable>
  </PropertyGroup>

</Project>

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