List<Item> Item = (from it in _context.Item
                    join iv in _context.ItemVersions on it.Id equals iv.ItemId
                    join iot in _context.ItemOriginalTitles on iv.Id equals iot.ItemVersionId                    
                    where term.ToLower() == "all" || (it.Name.ToLower() == term.ToLower() || it.Name.ToLower().Contains(term.ToLower()) || iot.Value.Contains(term) || 
                    queryable.Any(x => iot.Value.Contains(x.SearchText)))
                    select new Item
                    {
                        Id = it.Id,Name = it.Name,TypeCodeId = it.TypeCodeId,TypeCode = it.TypeCode,OriginalLangId = it.OriginalLangId,SubGenreCodeId = it.SubGenreCodeId,ItemVersions = it.ItemVersions
                    }
                ).Include("ItemVersions.OriginalTitles").ToList();

如您所见，我正在尝试将OriginalTitles添加到ItemVersions实体，但是不能做到这一点（OriginalTitles始终是null）。 物品模型：

public class Item
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }
    public int TypeCodeId { get; set; }
    public TypeCodes TypeCode { get; set; }
    public int? OriginalLangId { get; set; }
    public int SubGenreCodeId { get; set; }
    public List<ItemVersion> ItemVersions { get; set; }      
}

和我的ItemVersions模型：

 public class ItemVersion
    {
        [Key]
        public int Id { get; set; }
        public string Name { get; set; }
        public List<ItemOriginalTitle> OriginalTitles { get; set; }
        public List<ItemShortTitle> ShortTitles { get; set; }
        public List<ItemSynopsis> ItemSynopsis { get; set; }
        public List<ItemLongSynopsis> ItemLongSynopsis { get; set; }
        public List<ItemLanguage> ItemLanguages { get; set; }
        public List<VersionChannel> VersionChannels { get; set; }
        public bool IsDefault { get; set; }
        public Item Item { get; set; }
        public int ItemId { get; set; }
    }

寻找一种可以立即包含它的方法，如果可能的话，无需对其进行迭代。谢谢