ForeignKeyConstraint.AcceptRejectRule 屬性

定義

命名空間:

System.Data

組件:

System.Data.Common.dll

來源:

ForeignKeyConstraint.cs

指示在叫用 AcceptChanges() 時應該跨越這個條件約束來發生的動作。

public:
 virtual property System::Data::AcceptRejectRule AcceptRejectRule { System::Data::AcceptRejectRule get(); void set(System::Data::AcceptRejectRule value); };

public virtual System.Data.AcceptRejectRule AcceptRejectRule { get; set; }

member this.AcceptRejectRule : System.Data.AcceptRejectRule with get, set

Public Overridable Property AcceptRejectRule As AcceptRejectRule

屬性值

AcceptRejectRule

其中一個 AcceptRejectRule 值。 可能的值包括 None 和 Cascade。 預設為 None。

範例

下列範例會 ForeignKeyConstraint建立 、設定其 AcceptRejectRule，並將條件約束新增至 DataTable 物件的 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.Tables("Suppliers").Constraints.Add(fkConstraint)
   suppliersProducts.EnforceConstraints = True
End Sub

備註

DataRow在叫用 方法之前AcceptChanges，或 DataTable 的變更不是最後的。 此時， AcceptRejectRule 會決定已變更或刪除之任何值的動作。

另請參閱

• AcceptRejectRule