清除所有数据的 DataTable。
[Visual Basic]
Public Sub Clear() [C#]
public void Clear();
[C++]
public: void Clear();
[JScript]
public function Clear();
备注
所有表中的所有行都被移除。如果表中有任何将使子行受到影响的强制子关系,则生成异常。
如果 DataSet 绑定到 XmlDataDocument,则调用 DataSet.Clear 或
DataTable.Clear将引发 NotSupportedException。为避免这种情况,请遍历每个表,逐个移除每一行。
示例
[Visual Basic, C#, C++] 以下示例清除所有数据的表。
[Visual Basic]
Private Sub ClearTable(myTable As DataTable)
Try
myTable.Clear()
Catch e As DataException
' Process exception and return.
Dim log As System.Diagnostics.EventLog = New System.Diagnostics.EventLog()
log.Source = "My Application"
log.WriteEntry(e.ToString())
Console.WriteLine("Exception of type {0} occurred.", e.GetType().ToString())
End Try
End Sub
[C#]
private void ClearTable(DataTable myTable){
try{
myTable.Clear();
}
catch (DataException e){
// Process exception and return.
System.Diagnostics.EventLog log = new System.Diagnostics.EventLog();
log.Source = "My Application";
log.WriteEntry(e.ToString());
Console.WriteLine("Exception of type {0} occurred.", e.GetType());
}
}
[C++]
private:
void ClearTable(DataTable* myTable){
try{
myTable->Clear();
}
catch (DataException* e){
// Process exception and return.
System::Diagnostics::EventLog* log = new System::Diagnostics::EventLog();
log->Source = S"My Application";
log->WriteEntry(e->ToString());
Console::WriteLine(S"Exception of type {0} occurred.", e->GetType());
}
}
[JScript] 没有可用于 JScript 的示例。若要查看 Visual Basic、C# 或 C++ 示例,请单击页左上角的“语言筛选器”按钮
。
要求
平台:Windows 98, Windows NT 4.0, Windows ME, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 系列, .NET Framework 精简版
请参见
DataTable 类 | DataTable 成员 | System.Data 命名空间