AspNetCore.Docs/aspnetcore/diagnostics/asp0004.md

title	description	author	monikerRange	ms.author	ms.date	no-loc	uid
ASP0004: Do not use action results with route handlers	Learn about analysis rule ASP0004: Do not use action results with route handlers	captainsafia	>= aspnetcore-6.0	riande	10/21/2021	Home Privacy Kestrel appsettings.json ASP.NET Core Identity cookie Cookie Blazor Blazor Server Blazor WebAssembly Identity Let's Encrypt Razor SignalR	diagnostics/asp0004

ASP0004: Do not use action results with route handlers

	Value
Rule ID	ASP0004
Category	Usage
Fix is breaking or non-breaking	Non-breaking

Cause

A route handler delegate returns a value that implements xref:Microsoft.AspNetCore.Mvc.IActionResult.

Rule description

Route handler endpoints do not support executing MVC's IActionResult instances. Returning an IActionResult that doesn't implement IResult results in serializing the result instance rather than executing the result.

app.MapGet("/todos/{id}", (int id) => new JsonResult(new Todo { .. }));

How to fix violations

To fix a violation of this rule, make sure that endpoint's route handler returns an xref:Microsoft.AspNetCore.Http.IResult type by using the xref:Microsoft.AspNetCore.Http.Results extension methods.

app.MapGet("/todos/{id}", (int id) => Results.Json(new Todo { .. }));

When to suppress warnings

Do not suppress a warning from this rule. Returning an IActionResult that doesn't implement IResult results in serializing the result instance rather than executing the result.