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DataGridColumnStyle.CheckValidDataSource 方法

  • 项目

如果 System.Windows.Forms.DataGrid 没有有效数据源，或该列未映射到数据源中的有效属性，将引发异常。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
Protected Sub CheckValidDataSource ( _
    value As CurrencyManager _
)
用法
Dim value As CurrencyManager

Me.CheckValidDataSource(value)

protected void CheckValidDataSource (
    CurrencyManager value
)

protected:
void CheckValidDataSource (
    CurrencyManager^ value
)

protected void CheckValidDataSource (
    CurrencyManager value
)

protected function CheckValidDataSource (
    value : CurrencyManager
)

参数

异常

异常类型 条件

ArgumentNullException

value 为 空引用（在 Visual Basic 中为 Nothing）。

ApplicationException

该列的 PropertyDescriptor 为 空引用（在 Visual Basic 中为 Nothing）。

示例

下面的代码示例获取数据源的 CurrencyManager，并使用 CheckValidDataSource 确定 CurrencyManager 是否有效。

Private Sub CheckCurrencyManager(myCurrencyManager As CurrencyManager)
    ' This code is from a class named MyDataGridColumnStyle derived
    ' from DataGridColumnStyle.
    Dim myGridColumn As MyDataGridColumnStyle = Me
    Try
        myGridColumn.CheckValidDataSource(myCurrencyManager)
    Catch e As ArgumentNullException
        Console.WriteLine(e.Message)
    Catch e As ApplicationException
        Console.WriteLine(e.Message)
    End Try
End Sub 'CheckCurrencyManager

private void CheckCurrencyManager(CurrencyManager myCurrencyManager) {
    // This code is from a class named MyDataGridColumnStyle derived
    // from DataGridColumnStyle.
    MyDataGridColumnStyle myGridColumn = this;
    try {
        myGridColumn.CheckValidDataSource(myCurrencyManager);
    }
    catch (ArgumentNullException e) {
        Console.WriteLine(e.Message);
    }
    catch (ApplicationException e) {
        Console.WriteLine(e.Message);
    }
}

private:
   void CheckCurrencyManager( CurrencyManager^ myCurrencyManager )
   {
      // This code is from a class named MyDataGridColumnStyle derived
      // from DataGridColumnStyle.
      MyDataGridColumnStyle^ myGridColumn = this;
      try
      {
         myGridColumn->CheckValidDataSource( myCurrencyManager );
      }
      catch ( ArgumentNullException^ e ) 
      {
         Console::WriteLine( e->Message );
      }
      catch ( ApplicationException^ e ) 
      {
         Console::WriteLine( e->Message );
      }
   }

private void CheckCurrencyManager(CurrencyManager myCurrencyManager)
{
    // This code is from a class named MyDataGridColumnStyle derived
    // from DataGridColumnStyle.
    MyDataGridColumnStyle myGridColumn = this;
    try {
        myGridColumn.CheckValidDataSource(myCurrencyManager);
    }
    catch (ArgumentNullException e) {
        Console.WriteLine(e.get_Message());
    }
    catch (ApplicationException e) {
        Console.WriteLine(e.get_Message());
    }
} //CheckCurrencyManager

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

请参见

参考

DataGridColumnStyle 类
DataGridColumnStyle 成员
System.Windows.Forms 命名空间