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 v10.0.0

來源:

ReferenceCollectionBuilder`.cs

配置此關係是否為必要條件（即外鍵屬性是否可指派 null）。

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

一個表示此關係是否必須的數值。

傳回

ReferenceCollectionBuilder<TPrincipalEntity,TDependentEntity>

同一個建構器實例，這樣可以串接多個設定呼叫。