DataRelation.ChildKeyConstraint 屬性

定義

命名空間:

System.Data

組件:

System.Data.Common.dll

來源:

DataRelation.cs

取得關聯的 ForeignKeyConstraint。

public:
 virtual property System::Data::ForeignKeyConstraint ^ ChildKeyConstraint { System::Data::ForeignKeyConstraint ^ get(); };

public virtual System.Data.ForeignKeyConstraint? ChildKeyConstraint { get; }

member this.ChildKeyConstraint : System.Data.ForeignKeyConstraint

Public Overridable ReadOnly Property ChildKeyConstraint As ForeignKeyConstraint

屬性值

ForeignKeyConstraint

ForeignKeyConstraint。

範例

下列範例會UpdateRule設定與相關聯 之的DataRelation、 DeleteRule和 AcceptReject 規則ForeignKeyConstraint。

Private Sub SetChildKeyConstraint(dataSet As DataSet)
   ' Set child and parent columns.
   Dim parentColumn As DataColumn = dataSet.Tables( _
       "Suppliers").Columns("SupplierID")
   Dim childColumn As DataColumn = dataSet.Tables( _
       "Products").Columns("SupplierID")
   Dim relation As New DataRelation( _
       "SuppliersConstraint", parentColumn, childColumn)
   dataSet.Relations.Add(relation)

   Dim foreignKey As ForeignKeyConstraint = _
       relation.ChildKeyConstraint
   foreignKey.DeleteRule = Rule.SetNull
   foreignKey.UpdateRule = Rule.Cascade
   foreignKey.AcceptRejectRule = AcceptRejectRule.Cascade
End Sub

備註

如果這個關聯性沒有任何關聯的 ForeignKeyConstraint 存在，當關聯性加入至關聯集合時，就會自動建立該關聯性，並由 ChildKeyConstraint指向 。

另請參閱

• AcceptRejectRule
• ParentKeyConstraint
• Rule