DataSet.Clear メソッド

public:
 void Clear();

public void Clear ();

member this.Clear : unit -> unit

Public Sub Clear ()

例

次の例では、 DataSet すべてのテーブルのすべての行のをクリアします。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

注釈

DataSetがにバインドされている場合は、を XmlDataDocument 呼び出す DataSet.Clear か DataTable.Clear 、が発生し NotSupportedException ます。If the DataSet is bound to an XmlDataDocument, calling DataSet.Clear or DataTable.Clear raises the NotSupportedException. このような状況を回避するには、各テーブルを走査し、各行を一度に1行ずつ削除します。To avoid this situation, traverse each table, removing each row one at a time.

適用対象

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• ADO.NET でのデータセットの使用Using DataSets in ADO.NET