ReferentialConstraint 构造函数

定义

在关系上构造新约束

public ReferentialConstraint(System.Data.Entity.Core.Metadata.Edm.RelationshipEndMember fromRole, System.Data.Entity.Core.Metadata.Edm.RelationshipEndMember toRole, System.Collections.Generic.IEnumerable<System.Data.Entity.Core.Metadata.Edm.EdmProperty> fromProperties, System.Collections.Generic.IEnumerable<System.Data.Entity.Core.Metadata.Edm.EdmProperty> toProperties);
new System.Data.Entity.Core.Metadata.Edm.ReferentialConstraint : System.Data.Entity.Core.Metadata.Edm.RelationshipEndMember * System.Data.Entity.Core.Metadata.Edm.RelationshipEndMember * seq<System.Data.Entity.Core.Metadata.Edm.EdmProperty> * seq<System.Data.Entity.Core.Metadata.Edm.EdmProperty> -> System.Data.Entity.Core.Metadata.Edm.ReferentialConstraint
Public Sub New (fromRole As RelationshipEndMember, toRole As RelationshipEndMember, fromProperties As IEnumerable(Of EdmProperty), toProperties As IEnumerable(Of EdmProperty))

参数

fromRole
RelationshipEndMember

关系源自的角色

toRole
RelationshipEndMember

关系链接到的角色/目标角色

fromProperties
IEnumerable<EdmProperty>

对参与约束的角色的实体类型的属性

toProperties
IEnumerable<EdmProperty>

来自角色的实体类型的属性,这些属性参与约束

例外

参数 Null 异常(如果任何参数为 null)

适用于