DataGridColumnStyle.CheckValidDataSource(CurrencyManager) 方法

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

如果 DataGrid 沒有有效的資料來源，或者這個資料行並未對應至資料來源的有效屬性，則會擲回例外狀況。

protected:
 void CheckValidDataSource(System::Windows::Forms::CurrencyManager ^ value);

protected void CheckValidDataSource (System.Windows.Forms.CurrencyManager value);

member this.CheckValidDataSource : System.Windows.Forms.CurrencyManager -> unit

Protected Sub CheckValidDataSource (value As CurrencyManager)

參數

value

CurrencyManager

要檢查的 CurrencyManager。

例外狀況

ArgumentNullException

value 為 null。

ApplicationException

這個資料行的 PropertyDescriptor 為 null。

範例

下列程式碼範例會取得 CurrencyManager 資料來源的 ，並使用 CheckValidDataSource 來判斷 是否 CurrencyManager 有效。

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 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