I have this function in a controller –

[ServiceFilter(typeof(LoggedInAttribute))]
[HttpPut("bio")]
public ActionResult<string> ChangeBio(string UserId, string Bio)
{ ... }

and this attribute class –

public class LoggedInAttribute : ActionFilterAttribute
{
  ...

  public async override void OnActionExecuting(ActionExecutingContext filterContext)
  {
    // HERE IS `filterContext.ActionArguments.Keys.Count` ALWAYS ZERO
    // NO MATTER THE ACTION ITS CALLED FROM
  }

  ...
}

Why could this be happening? This puzzles me the most, in one field it sees the parameters and in the other it doesn’t?