DataRelation.ParentKeyConstraint Propriedade

Definição

Obtém o UniqueConstraint que garante que os valores na coluna pai de um DataRelation são exclusivos.Gets the UniqueConstraint that guarantees that values in the parent column of a DataRelation are unique.

public:
 virtual property System::Data::UniqueConstraint ^ ParentKeyConstraint { System::Data::UniqueConstraint ^ get(); };
public virtual System.Data.UniqueConstraint ParentKeyConstraint { get; }
member this.ParentKeyConstraint : System.Data.UniqueConstraint
Public Overridable ReadOnly Property ParentKeyConstraint As UniqueConstraint

Valor da propriedade

Uma UniqueConstraint que garante que os valores em uma coluna pai sejam exclusivos.A UniqueConstraint that makes sure that values in a parent column are unique.

Exemplos

O exemplo a seguir obtém a ParentKeyConstraint de um objeto DataRelation.The following example gets the ParentKeyConstraint of a DataRelation object.

Private Sub GetParentKeyConstraint()
    ' Get a DataRelation from a DataSet.
    Dim relation As DataRelation = _
        DataSet1.Relations("CustomerOrders")

    ' Get the relations parent key constraint.
    Dim constraint As UniqueConstraint = _
        relation.ParentKeyConstraint

    ' Get the constraint's DataColumns
    Dim constraintColumns() As DataColumn
    constraintColumns = constraint.Columns

    ' Print the column names.
    Dim i As Integer
    For i = 0 to constraintColumns.GetUpperBound(0)
       Console.WriteLine(constraintColumns(i).ColumnName.ToString())
    Next i
End Sub

Aplica-se a

Veja também