ReferenceCollectionBuilder<TPrincipalEntity,TDependentEntity>.IsRequired 方法

定義

命名空間:

Microsoft.EntityFrameworkCore.Metadata.Builders

組件:

Microsoft.EntityFrameworkCore.dll

套件:

Microsoft.EntityFrameworkCore v8.0.0

設定這是否為必要關聯性 (，亦即是否可以) 指派 null 外鍵屬性 (s) 。

public virtual Microsoft.EntityFrameworkCore.Metadata.Builders.ReferenceCollectionBuilder<TPrincipalEntity,TDependentEntity> IsRequired (bool required = true);

override this.IsRequired : bool -> Microsoft.EntityFrameworkCore.Metadata.Builders.ReferenceCollectionBuilder<'PrincipalEntity, 'DependentEntity (requires 'PrincipalEntity : null and 'DependentEntity : null)>

Public Overridable Function IsRequired (Optional required As Boolean = true) As ReferenceCollectionBuilder(Of TPrincipalEntity, TDependentEntity)

參數

required

Boolean

值，指出這是否為必要關聯性。

傳回

ReferenceCollectionBuilder<TPrincipalEntity,TDependentEntity>

相同的產生器實例，以便鏈結多個組態呼叫。