使用C＃以编程方式重置Excel工作簿密码

Question

Is it possible to reset/rewrite password in excel workbook using c#?

I tried to do a couple things, but it did't solve my question:

1) workbook.Password = ""; doesn't help

2) workbook.Protect ("",true,true);

workbook.Unprotect(""); doestn't help

3) I also tried to resave workbook.SaveAs(workbook.FullName,XlNormal,"","",false,null,Excel.XlSaveAsAccessMode.xlNoChange,null,false,null,null,false);

If you have any idea, please help.

Answer 1

the way to go is

workbook.Unprotect(pwd);

But to have it work you need to pass it the correct password, ie string.Empty is not enough.

Be careful that password protection can be put not only on workbooks, but even on the single worksheets, so it could be better to loop on the sheets and call Unprotect on them, too.

If you don't know the password, here you can find an excel macro that can unprotect your file. It shouldn't be too difficult to translate it into C if you really need to.