ForeignKeyConstraint.AcceptRejectRule Propriedade

Definição

Indica a ação que deve ocorrer por essa restrição quando AcceptChanges() é invocado.Indicates the action that should take place across this constraint when AcceptChanges() is invoked.

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

Valor da propriedade

Um dos valores de AcceptRejectRule.One of the AcceptRejectRule values. Os valores possíveis Noneincluem e Cascade.Possible values include None, and Cascade. O padrão é None.The default is None.

Atributos

Exemplos

O exemplo a seguir cria ForeignKeyConstraintum, define AcceptRejectRuleseu e adiciona a ConstraintCollectionrestrição a um DataTable objeto.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.Tables("Suppliers").Constraints.Add(fkConstraint)
   suppliersProducts.EnforceConstraints = True
End Sub

Comentários

Alterações em um DataRow ou DataTable não são finais até que AcceptChanges o método seja invocado.Changes to a DataRow or DataTable are not final until the AcceptChanges method is invoked. Nesse ponto, o AcceptRejectRule determina o curso de ação em qualquer valor que tenha sido alterado ou excluído.At that point, the AcceptRejectRule determines the course of action on any values that have been changed or deleted.

Aplica-se a

Veja também