DataSet.Relations DataSet.Relations DataSet.Relations DataSet.Relations Property

Définition

Obtient la collection des relations qui relient les tables et permettent de naviguer des tables parentes aux tables enfants.Gets the collection of relations that link tables and allow navigation from parent tables to child tables.

public:
 property System::Data::DataRelationCollection ^ Relations { System::Data::DataRelationCollection ^ get(); };
[System.Data.DataSysDescription("DataSetRelationsDescr")]
public System.Data.DataRelationCollection Relations { get; }
member this.Relations : System.Data.DataRelationCollection
Public ReadOnly Property Relations As DataRelationCollection

Valeur de propriété

DataRelationCollection qui contient une collection d'objets DataRelation.A DataRelationCollection that contains a collection of DataRelation objects. Une collection vide est retournée si aucun objet DataRelation n'existe.An empty collection is returned if no DataRelation objects exist.

Exemples

L’exemple suivant imprime le nom de colonne de toutes les tables Relations enfants par le biais de la propriété.The following example prints the column name of all child tables through the Relations property.

Private Sub PrintChildRelationRows()
   ' Declare variable to hold the row values.
   Dim rowValues As String
   Dim dataSet As DataSet

   ' Get the DataSet of a DataGrid that is displaying data 
   ' of at least two tables.
   Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)

   ' Navigate using the Relations.
   Dim relation As DataRelation
   Dim row As DataRow
   Dim column As DataColumn

   ' Print the names of each column in each table.
   For Each relation In dataSet.Relations
      For Each column in relation.ChildTable.Columns
          rowValues &= column.ColumnName & " "
      Next
    Next

    ' Display results.
    Console.WriteLine(rowValues)
   End Sub

S’applique à

Voir aussi