复杂类型引用的 EagerLoad 实体

Question

我有一个名为地址的实体。 Address 包含一个复杂类型，称为 House。房屋包含对其居住者的引用。占用者是一个实体。

public class Address {

    [key]
    public int Id { get; set; }

    public House House { get; set; }
}

房子：

[ComplexType] 
public class House
{

    [Required]
    public string HouseType { get; set; }


    public IList<Occupant> Occupants { get; set; }
}

乘员

public class Occupant
{

    [key]
    public int Id { get; set; }

    [Required]
    public string Name { get; set; }

    public virtual Address Address { get; set; }

}

如果我使用延迟加载，一切正常，我可以访问所有属性。但是，我需要使用 EagerLoading，因为在处理 Context 很久之后还需要实体。

我已尝试使用此代码包含属性：

   // DbSet is of type DbSet<Address>
   List<Address> eagerLoadedEntity = DbSet.Where(a => a.Address.StartsWith("a"))
                .Include(a => a.House.Occupants).ToList();

我收到以下错误：

A specified Include path is not valid. The EntityType 'Address' does not declare a navigation property with the name 'House'.

Answer 1

也许根本不可能？ MSDN Complex Types

Complex types cannot participate in associations and cannot contain navigation properties.

您在 "Include" 声明中将 "Occupants" 视为 "House" 上的导航属性，我想这可能是问题所在。

Answer 2

这是可能的

检查SO link to how to do nested eagerLoading

类似于：这只是一个未经测试的示例...您需要进行调整。

   List<Address> eagerLoadedEntity = Context.Addresses
                         .Include("House")
                         .Include("House.Occupants")
                         .Where(a => a.Address.StartsWith("a"))
                         .ToList();

更新

抱歉，我认为您可能对 ComplexTypes 是正确的……但如果它们都是数据库实体，那么您应该能够做……类似……仅供参考

public class Address
{
    public int Id {get; set;}

    public int HouseId {get; set;}

    public string AddressLine1 { get; set;}

    public House House {get; set;}
}
public class House
{
    public int Id {get; set;}
    public string HouseType {get; set;}

    public virtual ICollection<Occupant> Occupants { get; set;}
}

public class Occupant
{
    public int Id {get; set;}

    public int HouseId {get; set;}
    public int PersonId {get; set;}

    public bool IsOwner {get; set;}
    public DateTime StartDate {get; set;}
    public DateTime EndDate {get; set;}

    public Person Person {get; set;}
    public House House {get; set;}
}

public class Person 
{
    public int Id {get; set;}
    public string FirstName {get; set;}
}

预加载

List<Address> eagerLoadedEntity = Context.Addresses
                         .Include("House")
                         .Include("House.Occupants")
                         .Where(a => a.Address.AddressLine1.StartsWith("a"))
                         .ToList();

复杂类型引用的 EagerLoad 实体

EagerLoad entity referenced by complex type

c#

entity-framework

lazy-loading

eager-loading