C# EF Core 2.1所属类型的变化是什么?
上次更改是在2018年2月26日,但有一些突破性的更改需要修复 我有C# EF Core 2.1所属类型的变化是什么?,c#,entity-framework-core,ef-core-2.1,C#,Entity Framework Core,Ef Core 2.1,上次更改是在2018年2月26日,但有一些突破性的更改需要修复 我有MyProcessContext类型,用于许多实体: public class RequestData { public Guid CorrelationId { get; set; } public DateTime Updated { get; set; } public MyProcessContext ProcessContext { get; set; } } public class My
MyProcessContext
类型,用于许多实体:
public class RequestData
{
public Guid CorrelationId { get; set; }
public DateTime Updated { get; set; }
public MyProcessContext ProcessContext { get; set; }
}
public class MyProcessContext
{
public int ClientId { get; set; }
}
public class EntityConfiguration : IEntityTypeConfiguration<RequestData>
{
public void Configure(EntityTypeBuilder<RequestData> builder)
{
// all mapped by convention
builder.OwnsOne(x => x.ProcessContext);
builder.Property(x => x.Updated).IsRowVersion();
builder.HasKey(x => x.CorrelationId);
builder.Property(x => x.CorrelationId).ValueGeneratedNever();
}
}
升级后调试视图包含
EntityType: RequestData
...
ProcessContext (<ProcessContext>k__BackingField, MyProcessContext) ToDependent MyProcessContext 0 -1 1 -1 -1
...
EntityType: MyProcessContext
Properties:
RequestDataCorrelationId (no field, Guid) Shadow Required PK FK AfterSave:Throw 0 0 0 0 -1
ClientId (int) Required 1 1 -1 -1 -1
Keys:
RequestDataCorrelationId PK
Foreign keys:
MyProcessContext {'RequestDataCorrelationId'} -> RequestData {'CorrelationId'} Unique Ownership ToDependent: ProcessContext
Annotations:
Relational:TableName: process_request
RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]
entityIsOwned
为true,但entity.DefiningNavigationName
现在为null
我需要这个名字。到目前为止唯一的官方变化(EF Core 2.1)是添加了 然而,很明显,在实现中出现了突破性的变化,因此
definingTityType
和DefiningNavigationName
属性不再可靠(它们也没有文档化,只是“标准”生成的无用属性“获取定义实体类型”和“获取定义导航的名称”)
通过实验,我发现只有当拥有的类型在多个实体中使用时,才会填充它们。不知道他们为什么这么做,但主要的一点是我们不应该使用它们,而且EF核心代码本身似乎也不再使用它们了
据我所见,isoownership
、definingTityType
和DefiningNavigationName
术语由具有isoownership
属性等于true
的外键确定
换言之:
var ownershipFk = entityType.GetForeignKeys().FirstOrDefault(fk => fk.IsOwnership);
var isOwned = ownershipFk != null;
var definingEntityType = ownershipFk?.PrincipalEntityType;
var definingNavigationName = ownershipFk?.PrincipalToDependent.Name;
foreach (var entity in modelBuilder.Model.GetEntityTypes())
{
var entityIsOwned = entity.IsOwned();
var ownershipFk = entityType.GetForeignKeys().FirstOrDefault(fk => fk.IsOwnership);
var isOwned = ownershipFk != null;
var definingEntityType = ownershipFk?.PrincipalEntityType;
var definingNavigationName = ownershipFk?.PrincipalToDependent.Name;