EF复合键流利的API [英] EF Composite key fluent API
问题描述
我试图映射一个实体组合键。
I am trying to map a composite key for an entity.
public class Customer
{
public int CustomerId { get; set; }
public virtual List<CustomerImage> CustomerImages { get; set; }
}
和它的地图:
public class CustomerMap : EntityTypeConfiguration<Customer>
{
public CustomerMap()
{
HasKey(t => t.CustomerId);
ToTable(DbConstants.k_CustomersImageTable);
}
}
图像:
An Image:
public class Image
{
public int ImageId { get; set; }
}
和它的图:
public class ImageMap : EntityTypeConfiguration<Image>
{
public ImageMap()
{
HasKey(t => t.ImageId);
ToTable(DbConstants.k_ImagesTable);
}
}
和导航属性:
public class CustomerImage
{
public int CustomerId { get; set; }
public int ImageId { get; set; }
public virtual Customer CustomerRelated { get; set; }
public virtual Image ImageRelated { get; set; }
}
和它的图:
public class CustomerImageMap : EntityTypeConfiguration<CustomerImage>
{
public CustomerImageMap()
{
HasKey(t => new { t.CustomerId, t.ImageId });
Property(t => t.CustomerId).IsRequired().HasColumnOrder(0);
Property(t => t.ImageId).IsRequired().HasColumnOrder(1);
HasRequired(t => t.ImageRelated).WithMany().HasForeignKey(x => x.ImageId);
HasRequired(p => p.CustomerRelated)
.WithMany(p => p.CustomerImages)
.WillCascadeOnDelete(false);
ToTable(DbConstants.k_CustomersImageTable);
}
}
不过,我不断收到以下异常:
But I keep getting the following exception:
被模型生成过程中检测到一个或多个验证错误:结果
System.Data.Entity.Edm.EdmEntityType:的EntityType CustomerImage没有定义键。定义此的EntityType关键结果
System.Data.Entity.Edm.EdmEntitySet:的EntityType:EntitySet的'CustomerImages'是基于类型'CustomerImage'是没有定义的键
One or more validation errors were detected during model generation:
System.Data.Entity.Edm.EdmEntityType: : EntityType 'CustomerImage' has no key defined. Define the key for this EntityType.
System.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'CustomerImages' is based on type 'CustomerImage' that has no keys defined.
然而,如果我定义组合键与数据的注解,这是不是很漂亮,它完美的作品:
However, if I define the composite key with data annotations, which is not very nice, it works perfectly:
public class CustomerImage
{
[Key, Column(Order = 0)]
public int CustomerId { get; set; }
[Key, Column(Order = 1)]
public int ImageId { get; set; }
}
和它的图:
public class CustomerImageMap : EntityTypeConfiguration<CustomerImage>
{
public CustomerImageMap()
{
ToTable(DbConstants.k_CustomersImageTable);
}
}
我试过的定义但没有许多变化似乎工作。
你知道吗?难道是EF错误
I've tried many variations of the definitions but none seems to work. Any idea? Is it EF bug?
推荐答案
事实证明,我只是忘了把对的DbContext地图:
As it turned out, I simply forgot putting the map on the DbContext:
modelBuilder.Configurations.Add(new CustomerImageMap());
这是说,复合标识仍然没有在$人口元这种方式。因此使用数据annotaion这是生成的元数据:
That said, the composite Id still not being populated on the $metadata this way. And so using data annotaion this is the metadata that is generated:
<EntityType Name="CustomerImage">
<Key>
<PropertyRef Name="CustomerId"/>
<PropertyRef Name="ImageId"/>
</Key>
<Property Name="CustomerId" Type="Edm.Int32" Nullable="false"/>
<Property Name="ImageId" Type="Edm.Int32" Nullable="false"/>
<Property Name="LastUpdated" Type="Edm.DateTime"/>
<NavigationProperty Name="Customer" Relationship="EasyBizy.Entities.Models.EasyBizy_Entities_Models_CustomerImage_Customer_EasyBizy_Entities_Models_Customer_CustomerPartner" ToRole="Customer" FromRole="CustomerPartner"/>
<NavigationProperty Name="Image" Relationship="EasyBizy.Entities.Models.EasyBizy_Entities_Models_CustomerImage_Image_EasyBizy_Entities_Models_Image_ImagePartner" ToRole="Image" FromRole="ImagePartner"/>
</EntityType>
不过,如果用流利的API,而不是数据标注,未生成的关键部分都没有。
为什么?
However, if using fluent API instead of data annotation, the key part is not being generated at all. Why?
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