DataSet.Clear 方法

定义

命名空间:
System.Data
程序集:
netstandard.dll, System.Data.Common.dll
程序集:
System.Data.Common.dll
程序集:
System.Data.dll
程序集:
netstandard.dll
Source:
DataSet.cs
Source:
DataSet.cs
Source:
DataSet.cs
Source:
DataSet.cs
Source:
DataSet.cs

DataSet通过删除所有表中的所有行来清除任何数据。

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

示例

以下示例清除 DataSet 所有表中的所有行。

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

注解

DataSet如果绑定到一个XmlDataDocument，则调用DataSet.Clear或DataTable.Clear引发 。NotSupportedException 为了避免这种情况，请遍历每个表，逐个删除每一行。

适用于

另请参阅