C# 实体框架核心连接&;包括内部实体
和我的ItemVersions模型:C# 实体框架核心连接&;包括内部实体,c#,entity-framework,entity-framework-core,C#,Entity Framework,Entity Framework Core,和我的ItemVersions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 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; }
}
公共类ItemVersion
{
[关键]
公共int Id{get;set;}
公共字符串名称{get;set;}
公共列表原始目录{get;set;}
公开列表短标题{get;set;}
公共列表项概要{get;set;}
公共列表项LongSynopsis{get;set;}
公共列表项语言{get;set;}
公共列表版本通道{get;set;}
公共布尔值是默认值{get;set;}
公共项项{get;set;}
公共int ItemId{get;set;}
}
如果可能的话,寻找一种不需要迭代就可以立即包含它的方法。感谢尝试(将Include
方法移动到join
子句,其中选中了表):
List Item=来自它的_context.Item
在它上面的_context.ItemVersions.Include(“OriginalTitles”)中加入iv。Id等于iv.ItemId
在iv上的_context.itemOriginalties中加入iot。Id等于iot.ItemVersionId
其中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)))
选择新项目
{
Id=it.Id,
Name=it.Name,
TypeCodeId=it.TypeCodeId,
TypeCode=it.TypeCode,
OriginalLangId=it.OriginalLangId,
SubGenreCodeId=it.SubGenreCodeId,
ItemVersions=it.ItemVersions
};
因为我初始化了一个新对象,所以包含内部实体并不重要。我的解决方案是返回db对象并将includes移动到其中:
List<Item> Item = from it in _context.Item
join iv in _context.ItemVersions.Include("OriginalTitles") 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
};
@AaYy尝试
.Include(iv=>iv.originalties)
我相信“选择新项目”并不在意IncludeInclude(iv=>iv.originalties)
是一回事。不工作。如果由于lambda版本出现编译器错误而必须使用Include
的字符串版本,则可以确保Include无效。它可能作为\u context.Item.Include(“ItemVersions.OriginalTitles”)
工作,但我不确定,因为您没有输入EF版本,并且忽略的Include部分已经从文档中删除,这可能表明EF core 3中的行为还没有很好定义/稳定。您在说@GertArnold什么?我加入的原因是搜索,搜索才是最重要的。初始化新项目时,搜索不起作用。“他们想要”是什么意思?我问了这个问题。为什么投反对票??
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; }
}
List<Item> Item = from it in _context.Item
join iv in _context.ItemVersions.Include("OriginalTitles") 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
};
Item = (from it in _context.Item.Include("ItemVersions.OriginalTitles")
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 it
).ToList();