DataSet.Clear DataSet.Clear DataSet.Clear DataSet.Clear Method

Definizione

Cancella tutti i dati dall'oggetto DataSet rimuovendo tutte le righe in tutte le tabelle.Clears the DataSet of any data by removing all rows in all tables.

public:
 void Clear();
public void Clear ();
member this.Clear : unit -> unit
Public Sub Clear ()

Esempi

L'esempio seguente cancella i DataSet di tutte le righe in tutte le tabelle.The following example clears the DataSet of all rows in all tables.

private void ClearDataSet(DataSet dataSet)
{
    // To test, print the number rows in each table.
    foreach(DataTable table in dataSet.Tables)
    {
        Console.WriteLine(table.TableName + "Rows.Count = " 
            + table.Rows.Count.ToString());
    }
    // Clear all rows of each table.
    dataSet.Clear();

    // Print the number of rows again.
    foreach(DataTable table in dataSet.Tables)
    {
        Console.WriteLine(table.TableName + "Rows.Count = "  
            + table.Rows.Count.ToString());
    }
}
Private Sub ClearDataSet(ByVal dataSet As DataSet)
    ' To test, print the number rows in each table.
    Dim table As DataTable
    For Each table In dataSet.Tables
        Console.WriteLine(table.TableName & "Rows.Count = " _
            & table.Rows.Count.ToString())
    Next

    ' Clear all rows of each table.
    dataSet.Clear()

    ' Print the number of rows again.
    For Each table In dataSet.Tables
        Console.WriteLine(table.TableName & "Rows.Count = " _
            & table.Rows.Count.ToString())
    Next 
End Sub

Commenti

Se il DataSet è associato a un XmlDataDocument, la chiamata DataSet.Clear oppure DataTable.Clear genera il NotSupportedException.If the DataSet is bound to an XmlDataDocument, calling DataSet.Clear or DataTable.Clear raises the NotSupportedException. Per evitare questa situazione, scorrere ogni tabella, rimuovendo una riga alla volta.To avoid this situation, traverse each table, removing each row one at a time.

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