无法在C＃中使用saveAs方法保存Excel文件

Question

I'm saving an excel file using SaveAs method in c#. but it shows error like :

Additional information: The file could not be accessed. Try one of the following:

• Make sure the specified folder exists.

• Make sure the folder that contains the file is not read-only.

• Make sure the file name does not contain any of the following characters: < > ? [ ] : | or *

• Make sure the file/path name doesn't contain more than 218 characters.

my code is this :

string savepath = AppDomain.CurrentDomain.BaseDirectory + @"\Salary Slips\a.xlsx";
xlwbOP.SaveAs(savepath, Excel.XlFileFormat.xlExcel12);

the savepath variable have value savepath="D:\\Application\\WindowsFormsApplication1\\WindowsFormsApplication1\\bin\\Debug\\Salary Slips\\a.xlsx"

and the directory :"D:\\Application\\WindowsFormsApplication1\\WindowsFormsApplication1\\bin\\Debug\\Salary Slips\\" is exsits

Answer 1

If I'm remembering correctly (it's been awhile), you should check to makes sure the file exists before attempting to save. You might also want to wrap this in a try-catch block to handle exceptions caused by problems with permissions or paths not existing.

string savepath = AppDomain.CurrentDomain.BaseDirectory + @"\Salary Slips\a.xlsx";
try
{
    if(!File.Exists(savepath))
         xlwbOP.SaveAs(savepath, Excel.XlFileFormat.xlExcel12);
    else
         xlwbOP.Save();
}
catch
{  /*input your exception handling here*/ }

I also recommend verifying that your path doesn't contain invalid characters before trying to use it to save.

You may also want to look into using SaveCopyAs(string) for saving copies as new files.

Answer 2

As described in Exporting to .xlsx using Microsoft.Office.Interop.Excel SaveAs Error , the proper enum to save as .xlsx is not Excel.XlFileFormat.xlExcel12 but Excel.XlFileFormat.xlOpenXMLWorkbook

The correct way, here also incorporating the Missing.Value is therefore:

var missing = System.Reflection.Missing.Value;
var savepath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Salary Slips", "a.xlsx");
xlwbOP.SaveAs(savepath, Excel.XlFileFormat.xlOpenXMLWorkbook, missing,
    missing, false, false, missing, missing, true, missing, missing, missing);

Credits to SO user MoonKnight.