NuGet Warning NU1510

Scenario

PackageReference System.Text.Json will not be pruned. Consider removing this package from your dependencies, as it is likely unnecessary.

Issue

The package System.Text.Json has been specified for pruning through the PrunePackageReference feature. The .NET SDK generally specifies the list of packages to be pruned. The package is not needed as a direct PackageReference since the .NET runtime itself carries either the same or higher version of the assembly.

This warning is only raised when the PackageReference in question can be completely removed from the project.

Example 1

  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="System.Text.Json" Version="10.0.0" />
  </ItemGroup>

Example 2

  <PropertyGroup>
    <TargetFrameworks>net9.0;net10.0</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Condition="'$(TargetFramework)' == 'net10.0'" Include="System.Text.Json" Version="10.0.0" />
    <PackageReference Condition="'$(TargetFramework)' == 'net9.0'" Include="System.Text.Json" Version="9.0.0" />
  </ItemGroup>

Each conditional PackageReference for the System.Text.Json package can be removed because the package is already included in the respective .NET runtime versions for the frameworks it is declared for.

Example 3

  <PropertyGroup>
    <TargetFrameworks>net9.0;net10.0</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Condition="'$(TargetFramework)' == 'net9.0'" Include="System.Text.Json" Version="9.0.4" />
  </ItemGroup>

The System.Text.Json package is within the pruning range of the only framework it's declared for.

Solution

Remove the PackageReference as it's unnecessary.

  <PropertyGroup>
    <TargetFrameworks>net10.0;net48</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="System.Text.Json" Version="9.0.7" />
  </ItemGroup>