DataRelation.ParentKeyConstraint Propiedad

Definición

Espacio de nombres:

System.Data

Ensamblado:

System.Data.dll

Obtiene el UniqueConstraint objeto que garantiza que los valores de la columna primaria de son DataRelation únicos.

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 de propiedad

UniqueConstraint

que UniqueConstraint garantiza que los valores de una columna primaria sean únicos.

Ejemplos

En el ejemplo siguiente se obtiene el ParentKeyConstraint de un DataRelation objeto .

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

Consulte también

• ChildKeyConstraint
• UniqueConstraint