DataSet.Clear Methode

Definition

Entfernt alle Daten aus dem DataSet, indem alle Zeilen in sämtlichen Tabellen entfernt werden.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 ()

Beispiele

Im folgenden Beispiel wird der DataSet aller Zeilen in allen Tabellen gelöscht.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

Hinweise

Wenn die DataSet an eine XmlDataDocumentgebunden ist, löst der Aufruf von DataSet.Clear oder DataTable.Clear den NotSupportedExceptionaus.If the DataSet is bound to an XmlDataDocument, calling DataSet.Clear or DataTable.Clear raises the NotSupportedException. Um diese Situation zu vermeiden, durchlaufen Sie jede Tabelle, wobei jede Zeile einzeln entfernt wird.To avoid this situation, traverse each table, removing each row one at a time.

Gilt für:

Siehe auch