使用LINQ从产品列表中删除旧项目

Suppliers 类别和a Products

public class Supplier
{
    public Guid SupplierId { get; set; }
    public List<Product> Products { get; } = new List<Product>();
}
public class Product
{
    public string ItemCode { get; set; }
    public decimal ItemCost { get; set; }
    public Guid SupplierId { get; set; }
    public Supplier Supplier { get; set; }
}

我们希望首先删除新目录中不在旧目录中的项目。我们尝试使用此LINQ查询查找这些项

List<Product> discontinued = db.Products
.Where(e => !newCatalog
.Any(nc => (e.ItemCode == nc.ItemCode && e.SupplierId == nc.SupplierId))
.ToList();

db.Products.RemoveRange(discontinued);

Products.SupplierId != newCatalog.SupplierId

我们如何制定LINQ查询,以便只删除在中中断的项 newCatalog ?