ForeignKeyConstraint.AcceptRejectRule プロパティ


AcceptChanges() が呼び出されたときにこの制約全体で実行する必要があるアクションを示します。Indicates the action that should take place across this constraint when AcceptChanges() is invoked.

 virtual property System::Data::AcceptRejectRule AcceptRejectRule { System::Data::AcceptRejectRule get(); void set(System::Data::AcceptRejectRule value); };
public virtual System.Data.AcceptRejectRule AcceptRejectRule { get; set; }
public virtual System.Data.AcceptRejectRule AcceptRejectRule { get; set; }
member this.AcceptRejectRule : System.Data.AcceptRejectRule with get, set
member this.AcceptRejectRule : System.Data.AcceptRejectRule with get, set
Public Overridable Property AcceptRejectRule As AcceptRejectRule



AcceptRejectRule 値のいずれか 1 つ。One of the AcceptRejectRule values. 使用できる値は、NoneCascade などです。Possible values include None, and Cascade. 既定値は、None です。The default is None.


次の例では、を作成し、を ForeignKeyConstraint 設定 AcceptRejectRule して、制約をオブジェクトのに追加し DataTable ConstraintCollection ます。The following example creates a ForeignKeyConstraint, sets its AcceptRejectRule, and adds the constraint to a DataTable object's ConstraintCollection.

' The next line goes into the Declarations section of the module:
' SuppliersProducts is a class derived from DataSet.
Private suppliersProducts As SuppliersProducts 

Private Sub CreateConstraint()
   ' Declare parent column and child column variables.
   Dim parentColumn As DataColumn
   Dim childColumn As DataColumn
   Dim fkConstraint As ForeignKeyConstraint

   ' Set parent and child column variables.
   parentColumn = suppliersProducts.Tables("Suppliers").Columns("SupplierID")
   childColumn = suppliersProducts.Tables("Products").Columns("SupplieriD")
   fkConstraint = New ForeignKeyConstraint( _
       "SuppierFKConstraint", parentColumn, childColumn)

   ' Set null values when a value is deleted.
   fkConstraint.DeleteRule = Rule.SetNull
   fkConstraint.UpdateRule = Rule.Cascade
   fkConstraint.AcceptRejectRule = AcceptRejectRule.Cascade

   ' Add the constraint, and set EnforceConstraints to true.
   suppliersProducts.EnforceConstraints = True
End Sub


またはへの変更 DataRow DataTable は、メソッドが呼び出されるまでは最終的なものではありません AcceptChangesChanges to a DataRow or DataTable are not final until the AcceptChanges method is invoked. この時点で、は、 AcceptRejectRule 変更または削除されたすべての値に対する一連の操作を決定します。At that point, the AcceptRejectRule determines the course of action on any values that have been changed or deleted.