How to determine if an iOS view is pushed or popped with MonoTouch

This is a translation from Objective C to C# of the stackoverflow answer for: viewWillDisappear: Determine whether view controller is being popped or is showing a sub-view controller

public override void ViewWillDisappear (bool animated)
{
    var a = iOSUtils.GetActionOnView(this);
    
    if(a == iOSUtils.ViewOperation.Popped) {
    
    }
    else if(a == iOSUtils.ViewOperation.Pushed) {
    
    }
    base.ViewWillDisappear (animated);
}



public class iOSUtils {

  public enum ViewOperation {
   Pushed,
   Popped,
   Unknown
  }
  public static ViewOperation GetActionOnView(UIViewController viewController) {
     
   var viewControllers = viewController.NavigationController.ViewControllers;
   if(viewControllers.Length > 1 && viewControllers[viewControllers.Length-2] == viewController){
    return ViewOperation.Pushed;
   }
   else if(!viewControllers.Contains(viewController)){
    return ViewOperation.Popped;
   }
   return ViewOperation.Unknown;
  }
}