DataRelation.ChildKeyConstraint Propriedade

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 da propriedade

Uma ForeignKeyConstraint.

Exemplos

O exemplo a seguir define a UpdateRuleregra , DeleteRulee AcceptReject para o ForeignKeyConstraint associado ao 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

Comentários

Se não existir nenhum associado ForeignKeyConstraint para essa relação, ele será criado automaticamente e apontado pelo ChildKeyConstraint, quando a relação for adicionada à coleção de relações.

Aplica-se a

Confira também

• AcceptRejectRule
• ParentKeyConstraint
• Rule