DataSet.Clear Method

Definition

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 ()

Examples

Nell'esempio seguente viene cancellata la 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

Remarks

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

Applies to

See also