C# LINQ在一条语句中使用嵌套组

我正在将一些代码转换为LINQ，同时探索LINQ可以达到什么程度

下面的代码可以压缩成单个LINQ查询或方法吗

Dictionary<string, ItemPack> consolidated = new Dictionary<string, ItemPack>();
foreach (var product in Products)
{
    foreach (var smallpack in product.ItemPacks)
    {
        ItemPack bigpack;
        if (consolidated.TryGetValue(smallpack.ItemCode, out bigpack))
        {
            // the big pack quantity += quantity for making one product * the number of that product
            bigpack.Quantity += smallpack.Quantity * product.Quantity;

            // References: we make sure that the small pack is using the Item in the big pack.
            // otherwise there will be 2 occurance of the same Item
            smallpack.Item = bigpack.Item;
        }
        else
        {
            bigpack = new ItemPack(smallpack); // Copy constructor
            bigpack.Quantity = smallpack.Quantity * product.Quantity;
            consolidated.Add(smallpack.ItemCode, bigpack);
        }
    }
}
return consolidated;

如果我先分组，则无法为其数量选择项目。如果先选择，则会丢失分组。鸡和蛋的故事

编辑： 有用说明：smallpack是ItemPack类型，如下所示

public class ItemPack
{
     Item { get; } // The item in this pack, which *must* be a shared reference across all objects that uses this Item. So that change in Item properties are updated everywhere it is used. e.g. Price.
     ItemCode { get; } // The item code
     Quantity { get; } // The number of such Item in this pack.
}

---

谢谢你给我指出了正确的方向。我设法制定了完整的查询语法版本：

var query = from product in Products
            from smallpack in product.ItemPacks
            select new {
                Item = smallpack.Item,
                Quantity = smallpack.Quantity * product.Quantity
            } into mediumpack
            group mediumpack by mediumpack.Item.ItemCode into bigpack
            select new {
                Item = bigpack.First().Item, // shared reference
                Quantity = bigpack.Sum(a => a.Quantity);
            }

query.ToDictionary(...);

---

对这是否合适有什么意见吗？

谢谢你给我指出了正确的方向。我设法制定了完整的查询语法版本：

var query = from product in Products
            from smallpack in product.ItemPacks
            select new {
                Item = smallpack.Item,
                Quantity = smallpack.Quantity * product.Quantity
            } into mediumpack
            group mediumpack by mediumpack.Item.ItemCode into bigpack
            select new {
                Item = bigpack.First().Item, // shared reference
                Quantity = bigpack.Sum(a => a.Quantity);
            }

query.ToDictionary(...);

---

对这是否合适有什么意见吗？

是的，这和我的一样，所以很好。是的，这和我的一样，所以很好。

var query = from product in Products
            from smallpack in product.ItemPacks
            select new {
                Item = smallpack.Item,
                Quantity = smallpack.Quantity * product.Quantity
            } into mediumpack
            group mediumpack by mediumpack.Item.ItemCode into bigpack
            select new {
                Item = bigpack.First().Item, // shared reference
                Quantity = bigpack.Sum(a => a.Quantity);
            }

query.ToDictionary(...);