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DataSet.Clear 方法

定義

移除所有資料表中的資料列,以清除任何資料的 DataSet

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

範例

下列範例會 DataSet 清除所有的資料表中所有資料列的 。

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

備註

DataSet如果 系結至 XmlDataDocument,則呼叫 DataSet.ClearDataTable.Clear 引發 NotSupportedException。 若要避免這種情況,請周遊每個數據表,一次移除一個數據列。

適用於

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