Overridden razor page lifecycle methods detected as page handlers

[lakeman]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Any razor page model, with an overridden PageModel.OnPageHandler* method, without an explicit [NonHandler] attribute, will be discovered as a potential page handler. Which is a little surprising. eg;

public class MyPageModel : PageModel
{
    public override void OnPageHandlerExecuting(PageHandlerExecutingContext context)
    {
        // something....
        base.OnPageHandlerExecuting(context);
    }
}

I believe that this is due to comparing against methodInfo.DeclaringType, instead of methodInfo.GetBaseDefinition().DeclaringType in the following test;

aspnetcore/src/Mvc/Mvc.RazorPages/src/ApplicationModels/DefaultPageApplicationModelPartsProvider.cs

Line 193 in 7dbebe9

// Exclude the whole hierarchy of Page.

Expected Behavior

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Steps To Reproduce

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Exceptions (if any)

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.NET Version

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Anything else?

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