Analyzers API1000 and API1001 should trigger on returns (or expression-bodied methods) with conditional expressions.
public ActionResult<object> OopsUndocumentedIf(int id)
{
if (id == 0)
{
return NotFound(); // API1000
}
return Ok(new object());
}
public ActionResult<object> OopsUndocumentedConditional(int id)
{
return id == 0 ? NotFound() : Ok(new object()); // No API1000
}