pass method parameter from model to controller

Question

public List<ProductlistModel> GetProductList(int catId)
{
   List<ProductlistModel> products = db.ProductLists.Where(c=>c.CategoryID==catId).Select(s => new ProductlistModel()
}

This is my product repository in Business Logic. I am trying to pass catId in controller but it is throwing error.

private ProductRepository pr = new ProductRepository();

public ActionResult Index()
{
    List<ProductlistModel> products = pr.GetProductList(catId);
    return View(products);
}

How to access catId in controller?

Answer 1

For example:

public ActionResult Index(int? catId)
{
    // TODO: check catId for null
    List<ProductlistModel> products = pr.GetProductList(catId.Value);
    return View(products);
}

Answer 2

Pass catId as parameter. You can handle it by passing parameter as string and convert it to int before passing to the Function or Procedure of Model