如何以编程方式激活工作表？

Question

使用Excel的COM对象模型，如何激活工作表？我正在寻找替代???的地方在下面的C＃代码中。

// Note the currently active sheet.
object originalActiveSheet = activeWindow.ActiveSheet;

// Activate the target worksheet.
targetWorksheet.Activate();

// Do stuff that requires the target worksheet to be active.
// ...

// Re-activate the previously active sheet.
// ???

更新：

经过进一步研究，这是我能做的最好的事情：

// Re-activate the previously active sheet.
if (originalActiveSheet is Worksheet)
    ((Worksheet)originalActiveSheet).Activate();
else if (originalActiveSheet is Chart)
    ((Chart)originalActiveSheet).Activate();
else if (originalActiveSheet is DialogSheet)
    ((DialogSheet)originalActiveSheet).Activate();
else
    throw new Exception("Unable to re-activate the previously active sheet");

似乎是一个不完整的解决方案。有没有人有更好的东西？