Compiler Error after upgrading from .Net Core 2 to .Net 6

Question

I upgraded from .Net Core 2 to .Net 6. One of the errors that it caused was this:

Error CS1106 Extension method must be defined in a non-generic static class

It is happening on the public class BookController line.

So I did some research on the Microsoft site and I removed the static keyword from the LateFee method.

But that doesn't fix the error.

Is there anything else I need to do?

Here is my class:

public class BookController
    : LibraryController<BookClub, Books>
{

    public BookController(BookConfig<BookClub> ctx) 
        : base(ctx)
    {
    }

    private static bool LateFee(BookClub original, Books b)
    {
        return original.Date?.Id != b.CheckoutDate.TrimToNull();
    }
}

Here is the parent class:

public class LibraryController()

    [HttpPost("byLocation/{id}")]
    public IActionResult PostBookRequest(this Int32 id)
    {
        using (var tran = Session.BeginTransaction()) {
            foreach (var book in LibraryService.CreateHold(id)) {
                Session.Save(book);
            }
            tran.Commit();
            return NoContent();
        }
    }

Thanks!

Extension methods contain the this keyword as part of the first parameter in an extension method's parameter list. Are you sure you haven't declared such a method in this class? — Robert Harvey
– Robert Harvey, Commented Jun 2, 2022 at 14:23
@Fildor the parent class has that this keyword. Could that be it? — SkyeBoniwell
– SkyeBoniwell, Commented Jun 2, 2022 at 14:38
I find it very hard to believe that going from .NET Core 2 to .NET 6 would give you a compile error like this. That parent class you have posted would never have compiled in any version of C#/.NET. You need to provide a minimal reproducible example otherwise this question will be closed. — DavidG
– DavidG, Commented Jun 2, 2022 at 14:52
Even the line public class LibraryController() has never been valid C# code, that has NEVER compiled. — DavidG
– DavidG, Commented Jun 2, 2022 at 14:59

Blindy · Accepted Answer · 2022-06-02 14:53:05Z

2

public IActionResult PostBookRequest(this Int32 id)

Remove the this from that line, it's a syntactic error in .Net Core 2 and it remains a syntax error in .Net6.

answered Jun 2, 2022 at 14:53

Blindy

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2 Comments

SkyeBoniwell Over a year ago

thank you, so you mean so it looks like this? public IActionResult PostBookRequest(Int32 id) ?

Blindy Over a year ago

Or even better, public IActionResult PostBookRequest(int id)

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