RuntimeEntityType.AddForeignKey 方法

定義

命名空間:

Microsoft.EntityFrameworkCore.Metadata

組件:

Microsoft.EntityFrameworkCore.dll

套件:

Microsoft.EntityFrameworkCore v8.0.0

將新的關聯性加入至這個實體類型。

public virtual Microsoft.EntityFrameworkCore.Metadata.RuntimeForeignKey AddForeignKey (System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Metadata.RuntimeProperty> properties, Microsoft.EntityFrameworkCore.Metadata.RuntimeKey principalKey, Microsoft.EntityFrameworkCore.Metadata.RuntimeEntityType principalEntityType, Microsoft.EntityFrameworkCore.DeleteBehavior deleteBehavior = Microsoft.EntityFrameworkCore.DeleteBehavior.ClientSetNull, bool unique = false, bool required = false, bool requiredDependent = false, bool ownership = false);

abstract member AddForeignKey : System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Metadata.RuntimeProperty> * Microsoft.EntityFrameworkCore.Metadata.RuntimeKey * Microsoft.EntityFrameworkCore.Metadata.RuntimeEntityType * Microsoft.EntityFrameworkCore.DeleteBehavior * bool * bool * bool * bool -> Microsoft.EntityFrameworkCore.Metadata.RuntimeForeignKey
override this.AddForeignKey : System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Metadata.RuntimeProperty> * Microsoft.EntityFrameworkCore.Metadata.RuntimeKey * Microsoft.EntityFrameworkCore.Metadata.RuntimeEntityType * Microsoft.EntityFrameworkCore.DeleteBehavior * bool * bool * bool * bool -> Microsoft.EntityFrameworkCore.Metadata.RuntimeForeignKey

Public Overridable Function AddForeignKey (properties As IReadOnlyList(Of RuntimeProperty), principalKey As RuntimeKey, principalEntityType As RuntimeEntityType, Optional deleteBehavior As DeleteBehavior = Microsoft.EntityFrameworkCore.DeleteBehavior.ClientSetNull, Optional unique As Boolean = false, Optional required As Boolean = false, Optional requiredDependent As Boolean = false, Optional ownership As Boolean = false) As RuntimeForeignKey

參數

properties

IReadOnlyList<RuntimeProperty>

定義外鍵的屬性。

principalKey

RuntimeKey

參考的主要或替代索引鍵。

principalEntityType

RuntimeEntityType

關聯性針對的實體型別。 這可能與當關聯性以繼承階層中的衍生型別為目標時所定義的類型 principalKey 不同 (，因為索引鍵是在階層的基底類型上定義) 。

deleteBehavior

DeleteBehavior

值，指出刪除主體或中斷關聯性時，刪除作業如何套用至關聯性中的相依實體。

unique

Boolean

值，指出指派給外鍵屬性的值是否是唯一的。

required

Boolean

值，指出是否需要主體實體。

requiredDependent

Boolean

值，指出是否需要相依實體。

ownership

Boolean

值，指出這個關聯性是否定義擁有權。

傳回

RuntimeForeignKey

新建立的外鍵。