ReferentialConstraint 建構函式
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建構關聯性的新限制式
命名空間: System.Data.Entity.Core.Metadata.Edm
組件: EntityFramework (在 EntityFramework.dll 中)
語法
'宣告
Public Sub New ( _
fromRole As RelationshipEndMember, _
toRole As RelationshipEndMember, _
fromProperties As IEnumerable(Of EdmProperty), _
toProperties As IEnumerable(Of EdmProperty) _
)
'用途
Dim fromRole As RelationshipEndMember
Dim toRole As RelationshipEndMember
Dim fromProperties As IEnumerable(Of EdmProperty)
Dim toProperties As IEnumerable(Of EdmProperty)
Dim instance As New ReferentialConstraint(fromRole, _
toRole, fromProperties, toProperties)
public ReferentialConstraint(
RelationshipEndMember fromRole,
RelationshipEndMember toRole,
IEnumerable<EdmProperty> fromProperties,
IEnumerable<EdmProperty> toProperties
)
public:
ReferentialConstraint(
RelationshipEndMember^ fromRole,
RelationshipEndMember^ toRole,
IEnumerable<EdmProperty^>^ fromProperties,
IEnumerable<EdmProperty^>^ toProperties
)
new :
fromRole:RelationshipEndMember *
toRole:RelationshipEndMember *
fromProperties:IEnumerable<EdmProperty> *
toProperties:IEnumerable<EdmProperty> -> ReferentialConstraint
public function ReferentialConstraint(
fromRole : RelationshipEndMember,
toRole : RelationshipEndMember,
fromProperties : IEnumerable<EdmProperty>,
toProperties : IEnumerable<EdmProperty>
)
參數
- fromRole
類型:System.Data.Entity.Core.Metadata.Edm.RelationshipEndMember
產生關聯性的來源角色
- toRole
類型:System.Data.Entity.Core.Metadata.Edm.RelationshipEndMember
關聯性所連結/做為目標的角色
- fromProperties
類型:System.Collections.Generic.IEnumerable<EdmProperty>
目標角色的實體類型上參與限制式的屬性
- toProperties
類型:System.Collections.Generic.IEnumerable<EdmProperty>
來源角色的實體類型上參與限制式的屬性
例外狀況
例外狀況 | 條件 |
---|---|
ArgumentNullException | 如果有任何引數為 null,則為引數 Null 例外狀況 |