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在不久的将来，我想从 SQL Server 迁移到 MongoDB。现在我只是在玩弄所有的可能性并测试最好的模式设计。我偶然发现了一个问题。让我总结一下这个问题。

我有 30 个制造商，每个制造商都包含一个尺寸范围列表（如 S -> XXL）。每个尺码范围都有尺码列表（如 S、M、L、XL、XXL）。所以这是我创建的类：

public class Manufacturer : BaseEntity
{
    #region Ctor

    public Manufacturer()
    {
        SizeRanges = new List<SizeRange>();           
    }

    #endregion

    #region Properties    

    public string Name { get; set; }
    public string Description { get; set; }
    public string MetaTitle { get; set; }
    public string MetaDescription { get; set; }
    public double PurchaseDiscountPercentage { get; set; }
    public bool LimitedToStores { get; set; }
    public int DisplayOrder { get; set; }
    public State State { get; set; }
    public bool SyncToShop { get; set; }
    public bool Deleted { get; set; }
    public bool ManufactuerTierPriceHasChanged { get; set; }
    public bool ManufactuerSizesHasChanged { get; set; }
    public bool PurchaseDiscountPercentageChanged { get; set; }
    public DateTime? DateChanged { get; set; }
    public DateTime? DateCreated { get; set; }

    #endregion

    #region Mapping

    public Picture Picture { get; set; }
    public List<SizeRange> SizeRanges { get; set; }       

    #endregion

    #region Classes

    public class SizeRange
    {
        // Ctor

        public SizeRange()
        {
            Sizes = new List<Size>();
        }

        // Properties      

        public string Name { get; set; }
        public int DisplayOrder { get; set; }
        public bool Deleted { get; set; }
        public DateTime? DateChanged { get; set; }
        public DateTime? DateCreated { get; set; }

        // Mapping

        public List<Size> Sizes { get; set; }
    }

    public class Size
    {
        // Properties           

        public string SizeName { get; set; }
        public string LookupSize { get; set; }
        public int DisplayOrder { get; set; }
        public bool Deleted { get; set; }
        public DateTime? DateChanged { get; set; }
        public DateTime? DateCreated { get; set; }
    }      

    #endregion
}

现在这是我的问题。获得所有尺寸范围的最佳方法是什么？我使用 mongoDB 3.2 编写了这段代码。我在这里使用了 2 个步骤，但认为有更好的方法可以从所有制造商那里获得所有尺寸范围。如果有更好的方法，请告诉我。

var sizeRanges = await erpContext
            .Manufacturers
            .Find(FilterDefinition<MongoManufacturer>.Empty)
            .Project(x=> x.SizeRanges)
            .ToListAsync(); // results in a list containing 30 collections of size ranges

var sizeRangesList = sizeRanges
            .SelectMany(x => x)
            .ToList(); // get a list with only the size ranges.
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