DataSet.Clear メソッド

定義

すべてのテーブル内のすべての行を削除して、データの DataSet を消去します。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 ()

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.ClearDataTable.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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