I am adding a global exception handling project to my solution and have installed the Microsoft.AspNetCore.Diagnostics NuGet package. Although the package is recognized and listed in the project’s dependencies, I encounter an error when trying to use the IExceptionHandler interface. The error message is:

CS0234: The type or namespace name 'IExceptionHandler' does not exist in the namespace 'Microsoft.AspNetCore.Diagnostics' (are you missing an assembly reference?)

I am sharing this because similar issues on StackOverflow don’t address problems specific to the Microsoft.AspNetCore.Diagnostics package. Other references, like Microsoft.AspNetCore.Mvc and System.Data.SqlClient, resolve fine for my project. An older but similar issue was posted here. However, it does not exactly match my scenario.

Here are a few observations:

• Uninstalling the Microsoft.AspNetCore.Diagnostics package doesn’t cause VS to flag the using statement.

• A working project doesn’t have this package in its dependencies, which is puzzling.

• I have reset VS settings, cleared caches, and reinstalled VS, but the issue persists.

• The project builds despite the errors, which is also confusing.