实体框架 选择“查询”

我有以下类：

public class Seller : Entity
{
    public int SellerId { get; set; }
    public string Name { get; set; }
    public ICollection<InventoryItem> InventoryItems { get; set; }
}
public class InventoryItem : Entity
{
    public int InventoryId { get; set; }
    public int SellerId { get; set; }
    public string SellerSku { get; set; }
    public ICollection<SiteInventoryItem> SiteInventoryItems { get; set; }
}
public class SiteInventoryItem : Entity
{
    public int Id { get; set; }
    public int InventoryId { get; set; }
    public SiteType Site { get; set; }
}

因此，Seller具有InventoryItem集合，而又具有SiteInventoryItem集合。

如何获得包含InventoryItems列表的Seller，其中包含SiteType == SiteType.SiteName和Seller.SellerId == 14 SiteInventoryItems列表？

SiteType是Enum，db 类型是 int 。

我已经尝试了以下内容，它可以编译并运行，但结果不是预期的：

var seller = repo.Query(
                x => x.InventoryItems,
                x => x.InventoryItems.Select(y => y.SiteInventoryItems)
            ).Select(x => new
            {
                Seller = x,
                InventoryItems = x.InventoryItems,
                SiteInventoryItems = x.InventoryItems.Select(y => new
                {
                    InventoryItem = y,
                    SiteInventoryItems = y.SiteInventoryItems.Where(z => z.Site == SiteType.Amazon)
                })
            }).Where(x => x.Seller.SellerId == 14).First();

var seller = repo.Query()
        .Select(x => new
        {
            Seller = x,
            InventoryItems = x.InventoryItems.Select(y => new
            {
                InventoryItem = y,
                SiteInventoryItems = y.SiteInventoryItems.Where(z => z.Site == SiteType.Amazon)
            }).Where(y => y.SiteInventoryItems.Any())
        }).Where(x => x.Seller.Id == 14).First();