预加载时能否排除 EF 中的反向导航属性？
Can you exclude reverse navigation properties in EF when eager loading?
当我在 EF6 中使用 .Include 语法时，总是加载反向导航属性。有没有办法关闭它？这是一个示例查询。
private static IQueryable<Account> GetAccountsEager(this IRepository<Account> repository)
{
return repository
.Queryable()
.Include(e => e.AccountLocations
.Select(l => l.Address.City.State.Country));
}
这为我提供了帐户的 AccountLocations 集合。然而，地址的城市有这个反向导航属性：
public virtual ICollection<Address> Addresses { get; set; }
..因此它会向后加载所有反向导航地址，以便在查询中提供比我想要的更多的数据。我可以以某种方式关闭反向导航吗？
我只想从实体中删除反向导航 属性，但在其他情况下，我实际上想向后看以从城市获取地址。
谢谢。
编辑 1：
我刚刚注意到这里有些奇怪。这不会加载城市的反向导航地址：
return repository.Queryable()
.Include(e => e.BillToAddress.AddressType)
.Include(e => e.BillToAddress.City.State.Country);
但是，如果我添加这样的包含：
return repository.Queryable()
.Include(e => e.BillToAddress.AddressType)
.Include(e => e.BillToAddress.City.State.Country);
.Include(e => e.AccountLocations.Select(a => a.Address.City.State.Country));
然后为 e.BillToAddress.City 和每个 AccountLocation 的 Address.City 加载反向导航地址。为什么在第三个包含上添加 .Select 会影响第二个包含？
这里是SQL:
exec sp_executesql N'SELECT
//removing [ProjectX].[Property] AS [Property] for brevity
//essentially a line for each property of the syntax above...
FROM ( SELECT
[Limit1].[AccountId] AS [AccountId],
[Limit1].[AccountNumber] AS [AccountNumber],
[Limit1].[Name] AS [Name],
[Limit1].[Attention] AS [Attention],
[Limit1].[BillToAddressId] AS [BillToAddressId],
[Limit1].[NickName] AS [NickName],
[Limit1].[MainPhoneNumber] AS [MainPhoneNumber],
[Limit1].[MainFaxNumber] AS [MainFaxNumber],
[Limit1].[SalesFaxNumber] AS [SalesFaxNumber],
[Limit1].[AccountClassId] AS [AccountClassId],
[Limit1].[DefaultDiscountPercent] AS [DefaultDiscountPercent],
[Limit1].[DefaultCommissionPercent] AS [DefaultCommissionPercent],
[Limit1].[PaymentTermId] AS [PaymentTermId],
[Limit1].[StatementInd] AS [StatementInd],
[Limit1].[CarrierId] AS [CarrierId],
[Limit1].[TransportationTermId] AS [TransportationTermId],
[Limit1].[AccountExecUserId] AS [AccountExecUserId],
[Limit1].[Latitude] AS [Latitude],
[Limit1].[Longitude] AS [Longitude],
[Limit1].[ServCentContractStartDate] AS [ServCentContractStartDate],
[Limit1].[ServCentDiscountPercent] AS [ServCentDiscountPercent],
[Limit1].[MastDistContractStartDate] AS [MastDistContractStartDate],
[Limit1].[MastDistDiscountPercent] AS [MastDistDiscountPercent],
[Limit1].[MastDistDiscountDays] AS [MastDistDiscountDays],
[Limit1].[MastDistLyDiscountPercent] AS [MastDistLyDiscountPercent],
[Limit1].[AccountStartDate] AS [AccountStartDate],
[Limit1].[Website] AS [Website],
[Limit1].[InvoiceAttention] AS [InvoiceAttention],
[Limit1].[PromptPayPercent] AS [PromptPayPercent],
[Limit1].[PromptPayDays] AS [PromptPayDays],
[Limit1].[Ranking] AS [Ranking],
[Limit1].[OrderDiscountInd] AS [OrderDiscountInd],
[Limit1].[PromptPayInd] AS [PromptPayInd],
[Limit1].[SalesRepAccountBypassInd] AS [SalesRepAccountBypassInd],
[Limit1].[StatusReviewBypassInd] AS [StatusReviewBypassInd],
[Limit1].[CheckCreditLimitInd] AS [CheckCreditLimitInd],
[Limit1].[CantrolInd] AS [CantrolInd],
[Limit1].[PrintInvoiceInd] AS [PrintInvoiceInd],
[Limit1].[PrintStatementInd] AS [PrintStatementInd],
[Limit1].[PromptOrderAckInd] AS [PromptOrderAckInd],
[Limit1].[AdminFeeBypassInd] AS [AdminFeeBypassInd],
[Limit1].[InsertDatetime] AS [InsertDatetime],
[Limit1].[InsertSystemUserId] AS [InsertSystemUserId],
[Limit1].[UpdateDatetime] AS [UpdateDatetime],
[Limit1].[UpdateSystemUserId] AS [UpdateSystemUserId],
[Limit1].[AccountCreditId] AS [AccountCreditId],
[Limit1].[AccountGeographicClassId] AS [AccountGeographicClassId],
[Limit1].[AccountProductClassId] AS [AccountProductClassId],
[Limit1].[SalesTeamId] AS [SalesTeamId],
[Limit1].[AddressId] AS [AddressId],
[Limit1].[Address1] AS [Address1],
[Limit1].[Address2] AS [Address2],
[Limit1].[Address3] AS [Address3],
[Limit1].[AddressTypeId] AS [AddressTypeId],
[Limit1].[PostalCodeId] AS [PostalCodeId],
[Limit1].[CityId] AS [CityId],
[Limit1].[InsertDatetime1] AS [InsertDatetime1],
[Limit1].[InsertSystemUserId1] AS [InsertSystemUserId1],
[Limit1].[UpdateDatetime1] AS [UpdateDatetime1],
[Limit1].[UpdateSystemUserId1] AS [UpdateSystemUserId1],
[Limit1].[AddressTypeId1] AS [AddressTypeId1],
[Limit1].[AddressTypeCode] AS [AddressTypeCode],
[Limit1].[AddressTypeDesc] AS [AddressTypeDesc],
[Limit1].[InsertDatetime2] AS [InsertDatetime2],
[Limit1].[InsertSystemUserId2] AS [InsertSystemUserId2],
[Limit1].[UpdateDatetime2] AS [UpdateDatetime2],
[Limit1].[UpdateSystemUserId2] AS [UpdateSystemUserId2],
[Limit1].[AddressSubTypeId] AS [AddressSubTypeId],
[Limit1].[CityId1] AS [CityId1],
[Limit1].[CityName] AS [CityName],
[Limit1].[StateId] AS [StateId],
[Limit1].[InsertDatetime3] AS [InsertDatetime3],
[Limit1].[InsertSystemUserId3] AS [InsertSystemUserId3],
[Limit1].[UpdateDatetime3] AS [UpdateDatetime3],
[Limit1].[UpdateSystemUserId3] AS [UpdateSystemUserId3],
[Limit1].[CountyId] AS [CountyId],
[Limit1].[StateId1] AS [StateId1],
[Limit1].[StateCode] AS [StateCode],
[Limit1].[StateName] AS [StateName],
[Limit1].[CountryId] AS [CountryId],
[Limit1].[InsertDatetime4] AS [InsertDatetime4],
[Limit1].[InsertSystemUserId4] AS [InsertSystemUserId4],
[Limit1].[UpdateDatetime4] AS [UpdateDatetime4],
[Limit1].[UpdateSystemUserId4] AS [UpdateSystemUserId4],
[Limit1].[CountryId1] AS [CountryId1],
[Limit1].[CountryCode] AS [CountryCode],
[Limit1].[CountryName] AS [CountryName],
[Limit1].[InsertDatetime5] AS [InsertDatetime5],
[Limit1].[InsertSystemUserId5] AS [InsertSystemUserId5],
[Limit1].[UpdateDatetime5] AS [UpdateDatetime5],
[Limit1].[UpdateSystemUserId5] AS [UpdateSystemUserId5],
[Join9].[AccountLocationId] AS [AccountLocationId],
[Join9].[AccountId] AS [AccountId1],
[Join9].[AddressId1] AS [AddressId1],
[Join9].[ShipToNumber] AS [ShipToNumber],
[Join9].[AccountLocationName] AS [AccountLocationName],
[Join9].[Attention] AS [Attention1],
[Join9].[ContactId] AS [ContactId],
[Join9].[PhoneNumber] AS [PhoneNumber],
[Join9].[FaxNumber] AS [FaxNumber],
[Join9].[BranchOfficeFlag] AS [BranchOfficeFlag],
[Join9].[UPSAccountNumber] AS [UPSAccountNumber],
[Join9].[InsertDatetime1] AS [InsertDatetime6],
[Join9].[InsertSystemUserId1] AS [InsertSystemUserId6],
[Join9].[UpdateDatetime1] AS [UpdateDatetime6],
[Join9].[UpdateSystemUserId1] AS [UpdateSystemUserId6],
[Join9].[AddressId2] AS [AddressId2],
[Join9].[Address1] AS [Address11],
[Join9].[Address2] AS [Address21],
[Join9].[Address3] AS [Address31],
[Join9].[AddressTypeId] AS [AddressTypeId2],
[Join9].[PostalCodeId] AS [PostalCodeId1],
[Join9].[CityId1] AS [CityId2],
[Join9].[InsertDatetime2] AS [InsertDatetime7],
[Join9].[InsertSystemUserId2] AS [InsertSystemUserId7],
[Join9].[UpdateDatetime2] AS [UpdateDatetime7],
[Join9].[UpdateSystemUserId2] AS [UpdateSystemUserId7],
[Join9].[CityId2] AS [CityId3],
[Join9].[CityName] AS [CityName1],
[Join9].[StateId1] AS [StateId2],
[Join9].[InsertDatetime3] AS [InsertDatetime8],
[Join9].[InsertSystemUserId3] AS [InsertSystemUserId8],
[Join9].[UpdateDatetime3] AS [UpdateDatetime8],
[Join9].[UpdateSystemUserId3] AS [UpdateSystemUserId8],
[Join9].[CountyId] AS [CountyId1],
[Join9].[StateId2] AS [StateId3],
[Join9].[StateCode] AS [StateCode1],
[Join9].[StateName] AS [StateName1],
[Join9].[CountryId1] AS [CountryId2],
[Join9].[InsertDatetime4] AS [InsertDatetime9],
[Join9].[InsertSystemUserId4] AS [InsertSystemUserId9],
[Join9].[UpdateDatetime4] AS [UpdateDatetime9],
[Join9].[UpdateSystemUserId4] AS [UpdateSystemUserId9],
[Join9].[CountryId2] AS [CountryId3],
[Join9].[CountryCode] AS [CountryCode1],
[Join9].[CountryName] AS [CountryName1],
[Join9].[InsertDatetime5] AS [InsertDatetime10],
[Join9].[InsertSystemUserId5] AS [InsertSystemUserId10],
[Join9].[UpdateDatetime5] AS [UpdateDatetime10],
[Join9].[UpdateSystemUserId5] AS [UpdateSystemUserId10],
CASE WHEN ([Join9].[AccountLocationId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1]
FROM (SELECT TOP (1)
[Extent1].[AccountId] AS [AccountId],
[Extent1].[AccountNumber] AS [AccountNumber],
[Extent1].[Name] AS [Name],
[Extent1].[Attention] AS [Attention],
[Extent1].[BillToAddressId] AS [BillToAddressId],
[Extent1].[NickName] AS [NickName],
[Extent1].[MainPhoneNumber] AS [MainPhoneNumber],
[Extent1].[MainFaxNumber] AS [MainFaxNumber],
[Extent1].[SalesFaxNumber] AS [SalesFaxNumber],
[Extent1].[AccountClassId] AS [AccountClassId],
[Extent1].[DefaultDiscountPercent] AS [DefaultDiscountPercent],
[Extent1].[DefaultCommissionPercent] AS [DefaultCommissionPercent],
[Extent1].[PaymentTermId] AS [PaymentTermId],
[Extent1].[StatementInd] AS [StatementInd],
[Extent1].[CarrierId] AS [CarrierId],
[Extent1].[TransportationTermId] AS [TransportationTermId],
[Extent1].[AccountExecUserId] AS [AccountExecUserId],
[Extent1].[Latitude] AS [Latitude],
[Extent1].[Longitude] AS [Longitude],
[Extent1].[ServCentContractStartDate] AS [ServCentContractStartDate],
[Extent1].[ServCentDiscountPercent] AS [ServCentDiscountPercent],
[Extent1].[MastDistContractStartDate] AS [MastDistContractStartDate],
[Extent1].[MastDistDiscountPercent] AS [MastDistDiscountPercent],
[Extent1].[MastDistDiscountDays] AS [MastDistDiscountDays],
[Extent1].[MastDistLyDiscountPercent] AS [MastDistLyDiscountPercent],
[Extent1].[AccountStartDate] AS [AccountStartDate],
[Extent1].[Website] AS [Website],
[Extent1].[InvoiceAttention] AS [InvoiceAttention],
[Extent1].[PromptPayPercent] AS [PromptPayPercent],
[Extent1].[PromptPayDays] AS [PromptPayDays],
[Extent1].[Ranking] AS [Ranking],
[Extent1].[OrderDiscountInd] AS [OrderDiscountInd],
[Extent1].[PromptPayInd] AS [PromptPayInd],
[Extent1].[SalesRepAccountBypassInd] AS [SalesRepAccountBypassInd],
[Extent1].[StatusReviewBypassInd] AS [StatusReviewBypassInd],
[Extent1].[CheckCreditLimitInd] AS [CheckCreditLimitInd],
[Extent1].[CantrolInd] AS [CantrolInd],
[Extent1].[PrintInvoiceInd] AS [PrintInvoiceInd],
[Extent1].[PrintStatementInd] AS [PrintStatementInd],
[Extent1].[PromptOrderAckInd] AS [PromptOrderAckInd],
[Extent1].[AdminFeeBypassInd] AS [AdminFeeBypassInd],
[Extent1].[InsertDatetime] AS [InsertDatetime],
[Extent1].[InsertSystemUserId] AS [InsertSystemUserId],
[Extent1].[UpdateDatetime] AS [UpdateDatetime],
[Extent1].[UpdateSystemUserId] AS [UpdateSystemUserId],
[Extent1].[AccountCreditId] AS [AccountCreditId],
[Extent1].[AccountGeographicClassId] AS [AccountGeographicClassId],
[Extent1].[AccountProductClassId] AS [AccountProductClassId],
[Extent1].[SalesTeamId] AS [SalesTeamId],
[Extent2].[AddressId] AS [AddressId],
[Extent2].[Address1] AS [Address1],
[Extent2].[Address2] AS [Address2],
[Extent2].[Address3] AS [Address3],
[Extent2].[AddressTypeId] AS [AddressTypeId],
[Extent2].[PostalCodeId] AS [PostalCodeId],
[Extent2].[CityId] AS [CityId],
[Extent2].[InsertDatetime] AS [InsertDatetime1],
[Extent2].[InsertSystemUserId] AS [InsertSystemUserId1],
[Extent2].[UpdateDatetime] AS [UpdateDatetime1],
[Extent2].[UpdateSystemUserId] AS [UpdateSystemUserId1],
[Extent3].[AddressTypeId] AS [AddressTypeId1],
[Extent3].[AddressTypeCode] AS [AddressTypeCode],
[Extent3].[AddressTypeDesc] AS [AddressTypeDesc],
[Extent3].[InsertDatetime] AS [InsertDatetime2],
[Extent3].[InsertSystemUserId] AS [InsertSystemUserId2],
[Extent3].[UpdateDatetime] AS [UpdateDatetime2],
[Extent3].[UpdateSystemUserId] AS [UpdateSystemUserId2],
[Extent3].[AddressSubTypeId] AS [AddressSubTypeId],
[Extent4].[CityId] AS [CityId1],
[Extent4].[CityName] AS [CityName],
[Extent4].[StateId] AS [StateId],
[Extent4].[InsertDatetime] AS [InsertDatetime3],
[Extent4].[InsertSystemUserId] AS [InsertSystemUserId3],
[Extent4].[UpdateDatetime] AS [UpdateDatetime3],
[Extent4].[UpdateSystemUserId] AS [UpdateSystemUserId3],
[Extent4].[CountyId] AS [CountyId],
[Extent5].[StateId] AS [StateId1],
[Extent5].[StateCode] AS [StateCode],
[Extent5].[StateName] AS [StateName],
[Extent5].[CountryId] AS [CountryId],
[Extent5].[InsertDatetime] AS [InsertDatetime4],
[Extent5].[InsertSystemUserId] AS [InsertSystemUserId4],
[Extent5].[UpdateDatetime] AS [UpdateDatetime4],
[Extent5].[UpdateSystemUserId] AS [UpdateSystemUserId4],
[Extent6].[CountryId] AS [CountryId1],
[Extent6].[CountryCode] AS [CountryCode],
[Extent6].[CountryName] AS [CountryName],
[Extent6].[InsertDatetime] AS [InsertDatetime5],
[Extent6].[InsertSystemUserId] AS [InsertSystemUserId5],
[Extent6].[UpdateDatetime] AS [UpdateDatetime5],
[Extent6].[UpdateSystemUserId] AS [UpdateSystemUserId5]
FROM [dbo].[Account] AS [Extent1]
INNER JOIN [Common].[Address] AS [Extent2] ON [Extent1].[BillToAddressId] = [Extent2].[AddressId]
INNER JOIN [Common].[AddressType] AS [Extent3] ON [Extent2].[AddressTypeId] = [Extent3].[AddressTypeId]
INNER JOIN [Common].[City] AS [Extent4] ON [Extent2].[CityId] = [Extent4].[CityId]
INNER JOIN [Common].[State] AS [Extent5] ON [Extent4].[StateId] = [Extent5].[StateId]
INNER JOIN [Common].[Country] AS [Extent6] ON [Extent5].[CountryId] = [Extent6].[CountryId]
WHERE [Extent1].[AccountId] = @p__linq__0 ) AS [Limit1]
LEFT OUTER JOIN (SELECT [Extent7].[AccountLocationId] AS [AccountLocationId], [Extent7].[AccountId] AS [AccountId], [Extent7].[AddressId] AS [AddressId1], [Extent7].[ShipToNumber] AS [ShipToNumber], [Extent7].[AccountLocationName] AS [AccountLocationName], [Extent7].[Attention] AS [Attention], [Extent7].[ContactId] AS [ContactId], [Extent7].[PhoneNumber] AS [PhoneNumber], [Extent7].[FaxNumber] AS [FaxNumber], [Extent7].[BranchOfficeFlag] AS [BranchOfficeFlag], [Extent7].[UPSAccountNumber] AS [UPSAccountNumber], [Extent7].[InsertDatetime] AS [InsertDatetime1], [Extent7].[InsertSystemUserId] AS [InsertSystemUserId1], [Extent7].[UpdateDatetime] AS [UpdateDatetime1], [Extent7].[UpdateSystemUserId] AS [UpdateSystemUserId1], [Extent8].[AddressId] AS [AddressId2], [Extent8].[Address1] AS [Address1], [Extent8].[Address2] AS [Address2], [Extent8].[Address3] AS [Address3], [Extent8].[AddressTypeId] AS [AddressTypeId], [Extent8].[PostalCodeId] AS [PostalCodeId], [Extent8].[CityId] AS [CityId1], [Extent8].[InsertDatetime] AS [InsertDatetime2], [Extent8].[InsertSystemUserId] AS [InsertSystemUserId2], [Extent8].[UpdateDatetime] AS [UpdateDatetime2], [Extent8].[UpdateSystemUserId] AS [UpdateSystemUserId2], [Extent9].[CityId] AS [CityId2], [Extent9].[CityName] AS [CityName], [Extent9].[StateId] AS [StateId1], [Extent9].[InsertDatetime] AS [InsertDatetime3], [Extent9].[InsertSystemUserId] AS [InsertSystemUserId3], [Extent9].[UpdateDatetime] AS [UpdateDatetime3], [Extent9].[UpdateSystemUserId] AS [UpdateSystemUserId3], [Extent9].[CountyId] AS [CountyId], [Extent10].[StateId] AS [StateId2], [Extent10].[StateCode] AS [StateCode], [Extent10].[StateName] AS [StateName], [Extent10].[CountryId] AS [CountryId1], [Extent10].[InsertDatetime] AS [InsertDatetime4], [Extent10].[InsertSystemUserId] AS [InsertSystemUserId4], [Extent10].[UpdateDatetime] AS [UpdateDatetime4], [Extent10].[UpdateSystemUserId] AS [UpdateSystemUserId4], [Extent11].[CountryId] AS [CountryId2], [Extent11].[CountryCode] AS [CountryCode], [Extent11].[CountryName] AS [CountryName], [Extent11].[InsertDatetime] AS [InsertDatetime5], [Extent11].[InsertSystemUserId] AS [InsertSystemUserId5], [Extent11].[UpdateDatetime] AS [UpdateDatetime5], [Extent11].[UpdateSystemUserId] AS [UpdateSystemUserId5]
FROM [dbo].[AccountLocation] AS [Extent7]
INNER JOIN [Common].[Address] AS [Extent8] ON [Extent7].[AddressId] = [Extent8].[AddressId]
INNER JOIN [Common].[City] AS [Extent9] ON [Extent8].[CityId] = [Extent9].[CityId]
INNER JOIN [Common].[State] AS [Extent10] ON [Extent9].[StateId] = [Extent10].[StateId]
INNER JOIN [Common].[Country] AS [Extent11] ON [Extent10].[CountryId] = [Extent11].[CountryId] ) AS [Join9] ON [Limit1].[AccountId] = [Join9].[AccountId]
) AS [Project2]
ORDER BY [Project2].[AccountId] ASC, [Project2].[AddressId] ASC, [Project2].[AddressTypeId1] ASC, [Project2].[CityId1] ASC, [Project2].[StateId1] ASC, [Project2].[CountryId1] ASC, [Project2].[C1] ASC',N'@p__linq__0 int',@p__linq__0=21067
附加信息：
这是 DbContextConfiguration：
public DataContext(string nameOrConnectionString)
: base(nameOrConnectionString)
{
_instanceId = Guid.NewGuid();
Configuration.LazyLoadingEnabled = false;
Configuration.ProxyCreationEnabled = false;
}
这是执行查询的方法（使用 .FirstOrDefault()）：
public static Account GetEager(
this IRepository<Account> repository,
int id)
{
var query = repository.GetQueryableEager();
return query.FirstOrDefault(e => e.AccountId == id);
}
这是一个城市：
public partial class City: Entity, IDatabaseMetaData
{
public int CityId { get; set; } // CityId (Primary key)
public string CityName { get; set; } // CityName
public int StateId { get; set; } // StateId
public DateTime InsertDatetime { get; set; } // InsertDatetime
public int InsertSystemUserId { get; set; } // InsertSystemUserId
public DateTime? UpdateDatetime { get; set; } // UpdateDatetime
public int? UpdateSystemUserId { get; set; } // UpdateSystemUserId
public int? CountyId { get; set; } // CountyId
// Reverse navigation
public virtual ICollection<Address> Addresses { get; set; } // Address.FK_Address_CityId
// Foreign keys
public virtual County County { get; set; } // FK_City_CountyId
public virtual State State { get; set; } // FK_City_StateId
public City()
{
InsertDatetime = System.DateTime.Now;
Addresses = new List<Address>();
InitializePartial();
}
partial void InitializePartial();
}
我认为您看到的是 "relationship fix-up":
的结果
Relationship fix-up ensures that related objects are automatically linked when the second entity enters the ObjectContext.
http://blogs.msdn.com/b/alexj/archive/2009/10/13/tip-37-how-to-do-a-conditional-include.aspx
在您的情况下，由于您包括 AccountLocation.Address.City，EF 正在加载您请求的相关 Address 实体和相关 City 实体，并且作为 "fix-up" 它正在将加载的 Address 实体添加到 City.Addresses 导航集合中，这些实体将成为 City->Address 一对多关系的一部分。
您可以在 this link 找到另一个示例。与您的情况一样，延迟加载和代理创建也被禁用——但是，link 不包括禁用此行为的方法。
Can you exclude reverse navigation properties in EF when eager loading?
没有
正如另一个答案中所解释的那样，EF 有一个 关系修复 的过程，它将它加载到上下文中的所有实体编织在一起。您无法以任何方式停止此过程。因此，如果您不亲自动手，您将永远得到这个臃肿的 Json 字符串。 （我无法解释也无法重现您似乎发现的急切加载差异，但这些应该是一个新问题的主题。我不会 count 总是发生，希望他们将解决您当前的问题）。
所以这就是这里的关键：控制。最好的策略是什么取决于您的情况，但是有几个选项。
将查询投影为匿名类型并将其序列化为 JSON。只是一个最小的例子：
repository.Queryable()
.Select(e => new
{
Account = e.Name,
AccountLocations =
e.AccountLocations
.Select(l => new
{
Address = new { l.Address.Street, l.Address.Number },
City = l.Address.City.Name,
Country = l.Address.City.Country.Name,
})
});
有些人会对从方法返回匿名类型皱眉，即使它在 JSON 中，但对我来说它只是一种 returns JSON 以某种所需格式的方法。它只会让无类型的 JavaScript 世界更近一步。
对命名类型（DTO，或视图模型，类型）的结构执行相同的操作。
创建没有双向关联的专用上下文。这是一个经常被遗忘的选项，但为什么总是要有一个上下文来访问您的数据？仅确保上下文使用（或生成）的 类 与属于主上下文的名称不同。
顺便说一下，通过这样做，您还可以调整从数据库中获取的数据量以适应您需要序列化的数据量。
当我在 EF6 中使用 .Include 语法时，总是加载反向导航属性。有没有办法关闭它？这是一个示例查询。
private static IQueryable<Account> GetAccountsEager(this IRepository<Account> repository)
{
return repository
.Queryable()
.Include(e => e.AccountLocations
.Select(l => l.Address.City.State.Country));
}
这为我提供了帐户的 AccountLocations 集合。然而，地址的城市有这个反向导航属性：
public virtual ICollection<Address> Addresses { get; set; }
..因此它会向后加载所有反向导航地址，以便在查询中提供比我想要的更多的数据。我可以以某种方式关闭反向导航吗？
我只想从实体中删除反向导航 属性，但在其他情况下，我实际上想向后看以从城市获取地址。
谢谢。
编辑 1：
我刚刚注意到这里有些奇怪。这不会加载城市的反向导航地址：
return repository.Queryable()
.Include(e => e.BillToAddress.AddressType)
.Include(e => e.BillToAddress.City.State.Country);
但是，如果我添加这样的包含：
return repository.Queryable()
.Include(e => e.BillToAddress.AddressType)
.Include(e => e.BillToAddress.City.State.Country);
.Include(e => e.AccountLocations.Select(a => a.Address.City.State.Country));
然后为 e.BillToAddress.City 和每个 AccountLocation 的 Address.City 加载反向导航地址。为什么在第三个包含上添加 .Select 会影响第二个包含？
这里是SQL:
exec sp_executesql N'SELECT
//removing [ProjectX].[Property] AS [Property] for brevity
//essentially a line for each property of the syntax above...
FROM ( SELECT
[Limit1].[AccountId] AS [AccountId],
[Limit1].[AccountNumber] AS [AccountNumber],
[Limit1].[Name] AS [Name],
[Limit1].[Attention] AS [Attention],
[Limit1].[BillToAddressId] AS [BillToAddressId],
[Limit1].[NickName] AS [NickName],
[Limit1].[MainPhoneNumber] AS [MainPhoneNumber],
[Limit1].[MainFaxNumber] AS [MainFaxNumber],
[Limit1].[SalesFaxNumber] AS [SalesFaxNumber],
[Limit1].[AccountClassId] AS [AccountClassId],
[Limit1].[DefaultDiscountPercent] AS [DefaultDiscountPercent],
[Limit1].[DefaultCommissionPercent] AS [DefaultCommissionPercent],
[Limit1].[PaymentTermId] AS [PaymentTermId],
[Limit1].[StatementInd] AS [StatementInd],
[Limit1].[CarrierId] AS [CarrierId],
[Limit1].[TransportationTermId] AS [TransportationTermId],
[Limit1].[AccountExecUserId] AS [AccountExecUserId],
[Limit1].[Latitude] AS [Latitude],
[Limit1].[Longitude] AS [Longitude],
[Limit1].[ServCentContractStartDate] AS [ServCentContractStartDate],
[Limit1].[ServCentDiscountPercent] AS [ServCentDiscountPercent],
[Limit1].[MastDistContractStartDate] AS [MastDistContractStartDate],
[Limit1].[MastDistDiscountPercent] AS [MastDistDiscountPercent],
[Limit1].[MastDistDiscountDays] AS [MastDistDiscountDays],
[Limit1].[MastDistLyDiscountPercent] AS [MastDistLyDiscountPercent],
[Limit1].[AccountStartDate] AS [AccountStartDate],
[Limit1].[Website] AS [Website],
[Limit1].[InvoiceAttention] AS [InvoiceAttention],
[Limit1].[PromptPayPercent] AS [PromptPayPercent],
[Limit1].[PromptPayDays] AS [PromptPayDays],
[Limit1].[Ranking] AS [Ranking],
[Limit1].[OrderDiscountInd] AS [OrderDiscountInd],
[Limit1].[PromptPayInd] AS [PromptPayInd],
[Limit1].[SalesRepAccountBypassInd] AS [SalesRepAccountBypassInd],
[Limit1].[StatusReviewBypassInd] AS [StatusReviewBypassInd],
[Limit1].[CheckCreditLimitInd] AS [CheckCreditLimitInd],
[Limit1].[CantrolInd] AS [CantrolInd],
[Limit1].[PrintInvoiceInd] AS [PrintInvoiceInd],
[Limit1].[PrintStatementInd] AS [PrintStatementInd],
[Limit1].[PromptOrderAckInd] AS [PromptOrderAckInd],
[Limit1].[AdminFeeBypassInd] AS [AdminFeeBypassInd],
[Limit1].[InsertDatetime] AS [InsertDatetime],
[Limit1].[InsertSystemUserId] AS [InsertSystemUserId],
[Limit1].[UpdateDatetime] AS [UpdateDatetime],
[Limit1].[UpdateSystemUserId] AS [UpdateSystemUserId],
[Limit1].[AccountCreditId] AS [AccountCreditId],
[Limit1].[AccountGeographicClassId] AS [AccountGeographicClassId],
[Limit1].[AccountProductClassId] AS [AccountProductClassId],
[Limit1].[SalesTeamId] AS [SalesTeamId],
[Limit1].[AddressId] AS [AddressId],
[Limit1].[Address1] AS [Address1],
[Limit1].[Address2] AS [Address2],
[Limit1].[Address3] AS [Address3],
[Limit1].[AddressTypeId] AS [AddressTypeId],
[Limit1].[PostalCodeId] AS [PostalCodeId],
[Limit1].[CityId] AS [CityId],
[Limit1].[InsertDatetime1] AS [InsertDatetime1],
[Limit1].[InsertSystemUserId1] AS [InsertSystemUserId1],
[Limit1].[UpdateDatetime1] AS [UpdateDatetime1],
[Limit1].[UpdateSystemUserId1] AS [UpdateSystemUserId1],
[Limit1].[AddressTypeId1] AS [AddressTypeId1],
[Limit1].[AddressTypeCode] AS [AddressTypeCode],
[Limit1].[AddressTypeDesc] AS [AddressTypeDesc],
[Limit1].[InsertDatetime2] AS [InsertDatetime2],
[Limit1].[InsertSystemUserId2] AS [InsertSystemUserId2],
[Limit1].[UpdateDatetime2] AS [UpdateDatetime2],
[Limit1].[UpdateSystemUserId2] AS [UpdateSystemUserId2],
[Limit1].[AddressSubTypeId] AS [AddressSubTypeId],
[Limit1].[CityId1] AS [CityId1],
[Limit1].[CityName] AS [CityName],
[Limit1].[StateId] AS [StateId],
[Limit1].[InsertDatetime3] AS [InsertDatetime3],
[Limit1].[InsertSystemUserId3] AS [InsertSystemUserId3],
[Limit1].[UpdateDatetime3] AS [UpdateDatetime3],
[Limit1].[UpdateSystemUserId3] AS [UpdateSystemUserId3],
[Limit1].[CountyId] AS [CountyId],
[Limit1].[StateId1] AS [StateId1],
[Limit1].[StateCode] AS [StateCode],
[Limit1].[StateName] AS [StateName],
[Limit1].[CountryId] AS [CountryId],
[Limit1].[InsertDatetime4] AS [InsertDatetime4],
[Limit1].[InsertSystemUserId4] AS [InsertSystemUserId4],
[Limit1].[UpdateDatetime4] AS [UpdateDatetime4],
[Limit1].[UpdateSystemUserId4] AS [UpdateSystemUserId4],
[Limit1].[CountryId1] AS [CountryId1],
[Limit1].[CountryCode] AS [CountryCode],
[Limit1].[CountryName] AS [CountryName],
[Limit1].[InsertDatetime5] AS [InsertDatetime5],
[Limit1].[InsertSystemUserId5] AS [InsertSystemUserId5],
[Limit1].[UpdateDatetime5] AS [UpdateDatetime5],
[Limit1].[UpdateSystemUserId5] AS [UpdateSystemUserId5],
[Join9].[AccountLocationId] AS [AccountLocationId],
[Join9].[AccountId] AS [AccountId1],
[Join9].[AddressId1] AS [AddressId1],
[Join9].[ShipToNumber] AS [ShipToNumber],
[Join9].[AccountLocationName] AS [AccountLocationName],
[Join9].[Attention] AS [Attention1],
[Join9].[ContactId] AS [ContactId],
[Join9].[PhoneNumber] AS [PhoneNumber],
[Join9].[FaxNumber] AS [FaxNumber],
[Join9].[BranchOfficeFlag] AS [BranchOfficeFlag],
[Join9].[UPSAccountNumber] AS [UPSAccountNumber],
[Join9].[InsertDatetime1] AS [InsertDatetime6],
[Join9].[InsertSystemUserId1] AS [InsertSystemUserId6],
[Join9].[UpdateDatetime1] AS [UpdateDatetime6],
[Join9].[UpdateSystemUserId1] AS [UpdateSystemUserId6],
[Join9].[AddressId2] AS [AddressId2],
[Join9].[Address1] AS [Address11],
[Join9].[Address2] AS [Address21],
[Join9].[Address3] AS [Address31],
[Join9].[AddressTypeId] AS [AddressTypeId2],
[Join9].[PostalCodeId] AS [PostalCodeId1],
[Join9].[CityId1] AS [CityId2],
[Join9].[InsertDatetime2] AS [InsertDatetime7],
[Join9].[InsertSystemUserId2] AS [InsertSystemUserId7],
[Join9].[UpdateDatetime2] AS [UpdateDatetime7],
[Join9].[UpdateSystemUserId2] AS [UpdateSystemUserId7],
[Join9].[CityId2] AS [CityId3],
[Join9].[CityName] AS [CityName1],
[Join9].[StateId1] AS [StateId2],
[Join9].[InsertDatetime3] AS [InsertDatetime8],
[Join9].[InsertSystemUserId3] AS [InsertSystemUserId8],
[Join9].[UpdateDatetime3] AS [UpdateDatetime8],
[Join9].[UpdateSystemUserId3] AS [UpdateSystemUserId8],
[Join9].[CountyId] AS [CountyId1],
[Join9].[StateId2] AS [StateId3],
[Join9].[StateCode] AS [StateCode1],
[Join9].[StateName] AS [StateName1],
[Join9].[CountryId1] AS [CountryId2],
[Join9].[InsertDatetime4] AS [InsertDatetime9],
[Join9].[InsertSystemUserId4] AS [InsertSystemUserId9],
[Join9].[UpdateDatetime4] AS [UpdateDatetime9],
[Join9].[UpdateSystemUserId4] AS [UpdateSystemUserId9],
[Join9].[CountryId2] AS [CountryId3],
[Join9].[CountryCode] AS [CountryCode1],
[Join9].[CountryName] AS [CountryName1],
[Join9].[InsertDatetime5] AS [InsertDatetime10],
[Join9].[InsertSystemUserId5] AS [InsertSystemUserId10],
[Join9].[UpdateDatetime5] AS [UpdateDatetime10],
[Join9].[UpdateSystemUserId5] AS [UpdateSystemUserId10],
CASE WHEN ([Join9].[AccountLocationId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1]
FROM (SELECT TOP (1)
[Extent1].[AccountId] AS [AccountId],
[Extent1].[AccountNumber] AS [AccountNumber],
[Extent1].[Name] AS [Name],
[Extent1].[Attention] AS [Attention],
[Extent1].[BillToAddressId] AS [BillToAddressId],
[Extent1].[NickName] AS [NickName],
[Extent1].[MainPhoneNumber] AS [MainPhoneNumber],
[Extent1].[MainFaxNumber] AS [MainFaxNumber],
[Extent1].[SalesFaxNumber] AS [SalesFaxNumber],
[Extent1].[AccountClassId] AS [AccountClassId],
[Extent1].[DefaultDiscountPercent] AS [DefaultDiscountPercent],
[Extent1].[DefaultCommissionPercent] AS [DefaultCommissionPercent],
[Extent1].[PaymentTermId] AS [PaymentTermId],
[Extent1].[StatementInd] AS [StatementInd],
[Extent1].[CarrierId] AS [CarrierId],
[Extent1].[TransportationTermId] AS [TransportationTermId],
[Extent1].[AccountExecUserId] AS [AccountExecUserId],
[Extent1].[Latitude] AS [Latitude],
[Extent1].[Longitude] AS [Longitude],
[Extent1].[ServCentContractStartDate] AS [ServCentContractStartDate],
[Extent1].[ServCentDiscountPercent] AS [ServCentDiscountPercent],
[Extent1].[MastDistContractStartDate] AS [MastDistContractStartDate],
[Extent1].[MastDistDiscountPercent] AS [MastDistDiscountPercent],
[Extent1].[MastDistDiscountDays] AS [MastDistDiscountDays],
[Extent1].[MastDistLyDiscountPercent] AS [MastDistLyDiscountPercent],
[Extent1].[AccountStartDate] AS [AccountStartDate],
[Extent1].[Website] AS [Website],
[Extent1].[InvoiceAttention] AS [InvoiceAttention],
[Extent1].[PromptPayPercent] AS [PromptPayPercent],
[Extent1].[PromptPayDays] AS [PromptPayDays],
[Extent1].[Ranking] AS [Ranking],
[Extent1].[OrderDiscountInd] AS [OrderDiscountInd],
[Extent1].[PromptPayInd] AS [PromptPayInd],
[Extent1].[SalesRepAccountBypassInd] AS [SalesRepAccountBypassInd],
[Extent1].[StatusReviewBypassInd] AS [StatusReviewBypassInd],
[Extent1].[CheckCreditLimitInd] AS [CheckCreditLimitInd],
[Extent1].[CantrolInd] AS [CantrolInd],
[Extent1].[PrintInvoiceInd] AS [PrintInvoiceInd],
[Extent1].[PrintStatementInd] AS [PrintStatementInd],
[Extent1].[PromptOrderAckInd] AS [PromptOrderAckInd],
[Extent1].[AdminFeeBypassInd] AS [AdminFeeBypassInd],
[Extent1].[InsertDatetime] AS [InsertDatetime],
[Extent1].[InsertSystemUserId] AS [InsertSystemUserId],
[Extent1].[UpdateDatetime] AS [UpdateDatetime],
[Extent1].[UpdateSystemUserId] AS [UpdateSystemUserId],
[Extent1].[AccountCreditId] AS [AccountCreditId],
[Extent1].[AccountGeographicClassId] AS [AccountGeographicClassId],
[Extent1].[AccountProductClassId] AS [AccountProductClassId],
[Extent1].[SalesTeamId] AS [SalesTeamId],
[Extent2].[AddressId] AS [AddressId],
[Extent2].[Address1] AS [Address1],
[Extent2].[Address2] AS [Address2],
[Extent2].[Address3] AS [Address3],
[Extent2].[AddressTypeId] AS [AddressTypeId],
[Extent2].[PostalCodeId] AS [PostalCodeId],
[Extent2].[CityId] AS [CityId],
[Extent2].[InsertDatetime] AS [InsertDatetime1],
[Extent2].[InsertSystemUserId] AS [InsertSystemUserId1],
[Extent2].[UpdateDatetime] AS [UpdateDatetime1],
[Extent2].[UpdateSystemUserId] AS [UpdateSystemUserId1],
[Extent3].[AddressTypeId] AS [AddressTypeId1],
[Extent3].[AddressTypeCode] AS [AddressTypeCode],
[Extent3].[AddressTypeDesc] AS [AddressTypeDesc],
[Extent3].[InsertDatetime] AS [InsertDatetime2],
[Extent3].[InsertSystemUserId] AS [InsertSystemUserId2],
[Extent3].[UpdateDatetime] AS [UpdateDatetime2],
[Extent3].[UpdateSystemUserId] AS [UpdateSystemUserId2],
[Extent3].[AddressSubTypeId] AS [AddressSubTypeId],
[Extent4].[CityId] AS [CityId1],
[Extent4].[CityName] AS [CityName],
[Extent4].[StateId] AS [StateId],
[Extent4].[InsertDatetime] AS [InsertDatetime3],
[Extent4].[InsertSystemUserId] AS [InsertSystemUserId3],
[Extent4].[UpdateDatetime] AS [UpdateDatetime3],
[Extent4].[UpdateSystemUserId] AS [UpdateSystemUserId3],
[Extent4].[CountyId] AS [CountyId],
[Extent5].[StateId] AS [StateId1],
[Extent5].[StateCode] AS [StateCode],
[Extent5].[StateName] AS [StateName],
[Extent5].[CountryId] AS [CountryId],
[Extent5].[InsertDatetime] AS [InsertDatetime4],
[Extent5].[InsertSystemUserId] AS [InsertSystemUserId4],
[Extent5].[UpdateDatetime] AS [UpdateDatetime4],
[Extent5].[UpdateSystemUserId] AS [UpdateSystemUserId4],
[Extent6].[CountryId] AS [CountryId1],
[Extent6].[CountryCode] AS [CountryCode],
[Extent6].[CountryName] AS [CountryName],
[Extent6].[InsertDatetime] AS [InsertDatetime5],
[Extent6].[InsertSystemUserId] AS [InsertSystemUserId5],
[Extent6].[UpdateDatetime] AS [UpdateDatetime5],
[Extent6].[UpdateSystemUserId] AS [UpdateSystemUserId5]
FROM [dbo].[Account] AS [Extent1]
INNER JOIN [Common].[Address] AS [Extent2] ON [Extent1].[BillToAddressId] = [Extent2].[AddressId]
INNER JOIN [Common].[AddressType] AS [Extent3] ON [Extent2].[AddressTypeId] = [Extent3].[AddressTypeId]
INNER JOIN [Common].[City] AS [Extent4] ON [Extent2].[CityId] = [Extent4].[CityId]
INNER JOIN [Common].[State] AS [Extent5] ON [Extent4].[StateId] = [Extent5].[StateId]
INNER JOIN [Common].[Country] AS [Extent6] ON [Extent5].[CountryId] = [Extent6].[CountryId]
WHERE [Extent1].[AccountId] = @p__linq__0 ) AS [Limit1]
LEFT OUTER JOIN (SELECT [Extent7].[AccountLocationId] AS [AccountLocationId], [Extent7].[AccountId] AS [AccountId], [Extent7].[AddressId] AS [AddressId1], [Extent7].[ShipToNumber] AS [ShipToNumber], [Extent7].[AccountLocationName] AS [AccountLocationName], [Extent7].[Attention] AS [Attention], [Extent7].[ContactId] AS [ContactId], [Extent7].[PhoneNumber] AS [PhoneNumber], [Extent7].[FaxNumber] AS [FaxNumber], [Extent7].[BranchOfficeFlag] AS [BranchOfficeFlag], [Extent7].[UPSAccountNumber] AS [UPSAccountNumber], [Extent7].[InsertDatetime] AS [InsertDatetime1], [Extent7].[InsertSystemUserId] AS [InsertSystemUserId1], [Extent7].[UpdateDatetime] AS [UpdateDatetime1], [Extent7].[UpdateSystemUserId] AS [UpdateSystemUserId1], [Extent8].[AddressId] AS [AddressId2], [Extent8].[Address1] AS [Address1], [Extent8].[Address2] AS [Address2], [Extent8].[Address3] AS [Address3], [Extent8].[AddressTypeId] AS [AddressTypeId], [Extent8].[PostalCodeId] AS [PostalCodeId], [Extent8].[CityId] AS [CityId1], [Extent8].[InsertDatetime] AS [InsertDatetime2], [Extent8].[InsertSystemUserId] AS [InsertSystemUserId2], [Extent8].[UpdateDatetime] AS [UpdateDatetime2], [Extent8].[UpdateSystemUserId] AS [UpdateSystemUserId2], [Extent9].[CityId] AS [CityId2], [Extent9].[CityName] AS [CityName], [Extent9].[StateId] AS [StateId1], [Extent9].[InsertDatetime] AS [InsertDatetime3], [Extent9].[InsertSystemUserId] AS [InsertSystemUserId3], [Extent9].[UpdateDatetime] AS [UpdateDatetime3], [Extent9].[UpdateSystemUserId] AS [UpdateSystemUserId3], [Extent9].[CountyId] AS [CountyId], [Extent10].[StateId] AS [StateId2], [Extent10].[StateCode] AS [StateCode], [Extent10].[StateName] AS [StateName], [Extent10].[CountryId] AS [CountryId1], [Extent10].[InsertDatetime] AS [InsertDatetime4], [Extent10].[InsertSystemUserId] AS [InsertSystemUserId4], [Extent10].[UpdateDatetime] AS [UpdateDatetime4], [Extent10].[UpdateSystemUserId] AS [UpdateSystemUserId4], [Extent11].[CountryId] AS [CountryId2], [Extent11].[CountryCode] AS [CountryCode], [Extent11].[CountryName] AS [CountryName], [Extent11].[InsertDatetime] AS [InsertDatetime5], [Extent11].[InsertSystemUserId] AS [InsertSystemUserId5], [Extent11].[UpdateDatetime] AS [UpdateDatetime5], [Extent11].[UpdateSystemUserId] AS [UpdateSystemUserId5]
FROM [dbo].[AccountLocation] AS [Extent7]
INNER JOIN [Common].[Address] AS [Extent8] ON [Extent7].[AddressId] = [Extent8].[AddressId]
INNER JOIN [Common].[City] AS [Extent9] ON [Extent8].[CityId] = [Extent9].[CityId]
INNER JOIN [Common].[State] AS [Extent10] ON [Extent9].[StateId] = [Extent10].[StateId]
INNER JOIN [Common].[Country] AS [Extent11] ON [Extent10].[CountryId] = [Extent11].[CountryId] ) AS [Join9] ON [Limit1].[AccountId] = [Join9].[AccountId]
) AS [Project2]
ORDER BY [Project2].[AccountId] ASC, [Project2].[AddressId] ASC, [Project2].[AddressTypeId1] ASC, [Project2].[CityId1] ASC, [Project2].[StateId1] ASC, [Project2].[CountryId1] ASC, [Project2].[C1] ASC',N'@p__linq__0 int',@p__linq__0=21067
附加信息：
这是 DbContextConfiguration：
public DataContext(string nameOrConnectionString)
: base(nameOrConnectionString)
{
_instanceId = Guid.NewGuid();
Configuration.LazyLoadingEnabled = false;
Configuration.ProxyCreationEnabled = false;
}
这是执行查询的方法（使用 .FirstOrDefault()）：
public static Account GetEager(
this IRepository<Account> repository,
int id)
{
var query = repository.GetQueryableEager();
return query.FirstOrDefault(e => e.AccountId == id);
}
这是一个城市：
public partial class City: Entity, IDatabaseMetaData
{
public int CityId { get; set; } // CityId (Primary key)
public string CityName { get; set; } // CityName
public int StateId { get; set; } // StateId
public DateTime InsertDatetime { get; set; } // InsertDatetime
public int InsertSystemUserId { get; set; } // InsertSystemUserId
public DateTime? UpdateDatetime { get; set; } // UpdateDatetime
public int? UpdateSystemUserId { get; set; } // UpdateSystemUserId
public int? CountyId { get; set; } // CountyId
// Reverse navigation
public virtual ICollection<Address> Addresses { get; set; } // Address.FK_Address_CityId
// Foreign keys
public virtual County County { get; set; } // FK_City_CountyId
public virtual State State { get; set; } // FK_City_StateId
public City()
{
InsertDatetime = System.DateTime.Now;
Addresses = new List<Address>();
InitializePartial();
}
partial void InitializePartial();
}
我认为您看到的是 "relationship fix-up":
的结果Relationship fix-up ensures that related objects are automatically linked when the second entity enters the ObjectContext.
http://blogs.msdn.com/b/alexj/archive/2009/10/13/tip-37-how-to-do-a-conditional-include.aspx
在您的情况下，由于您包括 AccountLocation.Address.City，EF 正在加载您请求的相关 Address 实体和相关 City 实体，并且作为 "fix-up" 它正在将加载的 Address 实体添加到 City.Addresses 导航集合中，这些实体将成为 City->Address 一对多关系的一部分。
您可以在 this link 找到另一个示例。与您的情况一样，延迟加载和代理创建也被禁用——但是，link 不包括禁用此行为的方法。
Can you exclude reverse navigation properties in EF when eager loading?
没有
正如另一个答案中所解释的那样，EF 有一个 关系修复 的过程，它将它加载到上下文中的所有实体编织在一起。您无法以任何方式停止此过程。因此，如果您不亲自动手，您将永远得到这个臃肿的 Json 字符串。 （我无法解释也无法重现您似乎发现的急切加载差异，但这些应该是一个新问题的主题。我不会 count 总是发生，希望他们将解决您当前的问题）。
所以这就是这里的关键：控制。最好的策略是什么取决于您的情况，但是有几个选项。
将查询投影为匿名类型并将其序列化为 JSON。只是一个最小的例子：
repository.Queryable() .Select(e => new { Account = e.Name, AccountLocations = e.AccountLocations .Select(l => new { Address = new { l.Address.Street, l.Address.Number }, City = l.Address.City.Name, Country = l.Address.City.Country.Name, }) });有些人会对从方法返回匿名类型皱眉，即使它在 JSON 中，但对我来说它只是一种 returns JSON 以某种所需格式的方法。它只会让无类型的 JavaScript 世界更近一步。
对命名类型（DTO，或视图模型，类型）的结构执行相同的操作。
创建没有双向关联的专用上下文。这是一个经常被遗忘的选项，但为什么总是要有一个上下文来访问您的数据？仅确保上下文使用（或生成）的 类 与属于主上下文的名称不同。
顺便说一下，通过这样做，您还可以调整从数据库中获取的数据量以适应您需要序列化的数据量。