Action result returned from a route handler (ASP0004)

Key dotnet.api.route-handler-action-result · Severity warning · Category api

ASP.NET Core analyzer ASP0004. Flags a minimal-API route handler that returns an MVC IActionResult. It is serialised as JSON instead of being executed; Results.* is the equivalent.

Incorrect

app.MapGet("/orders/{id}", (int id) => new OkObjectResult(Find(id)));

Correct

app.MapGet("/orders/{id}", (int id) => Results.Ok(Find(id)));