DataRelation.ChildKeyConstraint Propiedad

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

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

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

member this.ChildKeyConstraint : System.Data.ForeignKeyConstraint

Public Overridable ReadOnly Property ChildKeyConstraint As ForeignKeyConstraint

Valor de propiedad

Un objeto ForeignKeyConstraint.

Ejemplos

En el ejemplo siguiente se establece la UpdateRuleregla , DeleteRuley AcceptReject para el ForeignKeyConstraint asociado a DataRelation.

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

Comentarios

Si no existe ningún asociado ForeignKeyConstraint para esta relación, se creará automáticamente y se señalará a , ChildKeyConstraintcuando la relación se agregue a la colección de relaciones.

Se aplica a

Consulte también

• AcceptRejectRule
• ParentKeyConstraint
• Rule