How to find NuGet packages referenced in code but not in project

I have a C# .NET 6 project where I need to find all NuGet packages that are referenced by the C# source but are not directly referenced in the project file. This can happen when the package is a transitive reference.

For example:

• My project contains a reference to package A
• Package A references package B
• My source code references types in package B
• But my project does not contain a reference to package B.

Project:

<PackageReference Include="A" Version="1.0.0"><!-- Note, no direct reference to B -->

C# Source:

using B;// ... class that references types from package B

This compiles and runs fine due to the transitive reference from A to B.

I have tried using dotnet list package. That only includes direct references.

I have also tried using dotnet list package --include-transitive. That includes all transitive references, including packages not references by my code.

Internet searches so far are not turning up any third-party utilities that appear to do what I need.

Is there any tool or technique to find the transitive packages referenced by my C# code?