通过

RelationshipManager.GetRelatedReference<TTargetEntity> 方法

  • 参考

定义

命名空间:
System.Data.Objects.DataClasses
程序集:
System.Data.Entity.dll

通过使用关系名称和目标角色名称的指定组合，获取相关对象的 EntityReference<TEntity>。

public:
generic <typename TTargetEntity>
 where TTargetEntity : class, System::Data::Objects::DataClasses::IEntityWithRelationships System::Data::Objects::DataClasses::EntityReference<TTargetEntity> ^ GetRelatedReference(System::String ^ relationshipName, System::String ^ targetRoleName);
public:
generic <typename TTargetEntity>
 where TTargetEntity : class System::Data::Objects::DataClasses::EntityReference<TTargetEntity> ^ GetRelatedReference(System::String ^ relationshipName, System::String ^ targetRoleName);
public System.Data.Objects.DataClasses.EntityReference<TTargetEntity> GetRelatedReference<TTargetEntity> (string relationshipName, string targetRoleName) where TTargetEntity : class, System.Data.Objects.DataClasses.IEntityWithRelationships;
public System.Data.Objects.DataClasses.EntityReference<TTargetEntity> GetRelatedReference<TTargetEntity> (string relationshipName, string targetRoleName) where TTargetEntity : class;
member this.GetRelatedReference : string * string -> System.Data.Objects.DataClasses.EntityReference<'argetEntity (requires 'argetEntity : null and 'argetEntity :> System.Data.Objects.DataClasses.IEntityWithRelationships)> (requires 'argetEntity : null and 'argetEntity :> System.Data.Objects.DataClasses.IEntityWithRelationships)
member this.GetRelatedReference : string * string -> System.Data.Objects.DataClasses.EntityReference<'argetEntity (requires 'argetEntity : null)> (requires 'argetEntity : null)
Public Function GetRelatedReference(Of TTargetEntity As {Class, IEntityWithRelationships}) (relationshipName As String, targetRoleName As String) As EntityReference(Of TTargetEntity)
Public Function GetRelatedReference(Of TTargetEntity As Class) (relationshipName As String, targetRoleName As String) As EntityReference(Of TTargetEntity)

类型参数

TTargetEntity

返回的 EntityReference<TEntity> 的类型。

参数

relationshipName
String

要浏览的关系的名称。 关系名称不由命名空间限定。

targetRoleName
String

要浏览的目标角色的名称。 指示在关系中浏览的方向。

返回

EntityReference<TTargetEntity>

相关对象的 EntityReference<TEntity>。

例外

InvalidOperationException

指定角色返回 EntityCollection<TEntity> 而不是 EntityReference<TEntity>。

注解

关系名称不应由命名空间限定。 如果将命名空间置于关系名称之前，将发生错误。

适用于