ReferenceOwnershipBuilder<TEntity,TRelatedEntity>.HasKey 方法

定義

命名空間:

Microsoft.EntityFrameworkCore.Metadata.Builders

組件:

Microsoft.EntityFrameworkCore.dll

套件:

Microsoft.EntityFrameworkCore v2.2.6

設定組成這個擁有之實體類型之主鍵的屬性。

public virtual Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder HasKey (System.Linq.Expressions.Expression<Func<TRelatedEntity,object>> keyExpression);

override this.HasKey : System.Linq.Expressions.Expression<Func<'RelatedEntity, obj>> -> Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder

Public Overridable Function HasKey (keyExpression As Expression(Of Func(Of TRelatedEntity, Object))) As KeyBuilder

參數

keyExpression

Expression<Func<TRelatedEntity,Object>>

Lambda 運算式，表示主鍵屬性 () (blog => blog.Url) 。

如果主鍵是由多個屬性所組成，請指定匿名型別，包括屬性 (post => new { post.Title, post.BlogId }) 。

傳回

KeyBuilder

可用來設定主鍵的物件。