DataTable.ParentRelations DataTable.ParentRelations DataTable.ParentRelations DataTable.ParentRelations Property

Definizione

Ottiene l'insieme di relazioni padre dell'oggetto DataTable.Gets the collection of parent relations for this DataTable.

public:
 property System::Data::DataRelationCollection ^ ParentRelations { System::Data::DataRelationCollection ^ get(); };
[System.ComponentModel.Browsable(false)]
[System.Data.DataSysDescription("DataTableParentRelationsDescr")]
public System.Data.DataRelationCollection ParentRelations { get; }
member this.ParentRelations : System.Data.DataRelationCollection
Public ReadOnly Property ParentRelations As DataRelationCollection

Valore della proprietà

Classe DataRelationCollection che contiene le relazioni padre della tabella.A DataRelationCollection that contains the parent relations for the table. Se non esiste alcun oggetto DataRelation viene restituito un insieme vuoto.An empty collection is returned if no DataRelation objects exist.

Esempi

L'esempio seguente usa il ParentRelations proprietà per restituire ogni elemento padre DataRelation in un DataTable.The following example uses the ParentRelations property to return each parent DataRelation in a DataTable. Ogni relazione viene quindi utilizzata come argomento in di GetParentRows metodo del DataRow per restituire una matrice di righe.Each relation is then used as an argument in the GetParentRows method of the DataRow to return an array of rows. Viene quindi stampato il valore di ogni colonna nella riga.The value of each column in the row is then printed.

private void GetChildRowsFromDataRelation(DataTable table)
{
    DataRow[] rowArray;
    foreach(DataRelation relation in table.ParentRelations)
    {
        foreach(DataRow row in table.Rows)
        {
            rowArray = row.GetParentRows(relation);
            // Print values of rows.
            for(int i = 0; i < rowArray.Length; i++)
            {
                foreach(DataColumn column in table.Columns)
                {
                    Console.WriteLine(rowArray[i][column]);
                }
            }
        }
    }
}
Private Sub GetChildRowsFromDataRelation(table As DataTable)
    Dim rowArray() As DataRow
    Dim relation As DataRelation, row As DataRow
    Dim column As DataColumn, i As Integer     
    For Each relation In  table.ParentRelations
        For Each row In  table.Rows
            rowArray = row.GetParentRows(relation)
            ' Print values of rows.             
            For i = 0 To rowArray.Length - 1                 
                For Each column In  table.Columns
                    Console.WriteLine(rowArray(i)(column))
                Next column
            Next i
        Next row
    Next relation
End Sub

Si applica a

Vedi anche