使用 ^ ]方法代替Workbook.SaveAs

Use the Workbook.Save[^] method instead of Workbook.SaveAs

从您发布的代码看来，您在添加工作簿之前已经知道要使用的名称(fName).

因此，在执行任何检查之前，是否存在

From the code that you have posted it seems that you are aware of the name you want to use (fName) prior to Adding your workbook.

Therefore before doing any of that check if it''s there

xlApp = new Excel.Application();
bool newWorkBook = false;

if (File.Exists(fName))
{
  // put code here to open the file
}
else
{
  xlWorkBook = xlApp.Workbooks.Add(misValue);
  newWorkBook = true;
}

xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

// rest of your code

if (newWorkBook)
{
  xlWorkBook.SaveAs(fName);
  xlWorkBook.Close(true, null, null);
}
else
{
  // do normal save here. CHECK SYNTAX OF
  xlWorkBool.Save();  // Dummy statement
}

xlApp.Quit();