//新增產品使用
public CProductListViewModel()
{
iv_product = new TProduct();
iv_productCategory = new TProductCategory();
iv_isOnSale = new TIsOnSale();
}
public CProductListViewModel(TProduct p, TProductCategory c, TIsOnSale s)
{
iv_product = p;
iv_productCategory = c;
iv_isOnSale = s;
}