AspNetCore.Docs/aspnetcore/diagnostics/mvc1001.md

title	description	author	monikerRange	ms.author	ms.date	uid
MVC1001: Filters cannot be applied to page handler methods	Learn about analysis rule MVC1001: Filters cannot be applied to page handler methods	pranavkm	>= aspnetcore-3.1	riande	10/21/2021	diagnostics/mvc1001

MVC1001: Filters cannot be applied to page handler methods

	Value
Rule ID	MVC1001
Fix is breaking or non-breaking	Non-breaking

Cause

An attribute implementing xref:Microsoft.AspNetCore.Mvc.Filters.IFilterMetadata was applied to a Razor Page handler method.

Rule description

Razor Page handler methods are selected after MVC filter execution has started, and consequently cannot contribute filters to execute. Applying a filter to a Razor Page handler is unsupported and always incorrect.

public class IndexModel : PageModel
{
    [MyFilter]
    public IActionResult OnGet() => Page();
}

How to fix violations

Remove the filter from the handler and apply it to the page model. If a filter has to be applied to a specific handler, consider using multiple Razor Pages.

[MyFilter]
public class IndexModel : PageModel
{
    public IActionResult OnGet() => Page();
}

When to suppress warnings

Don't suppress warnings from this rule.