C# Excel interop: Exception from HRESULT (DISP_E_BADINDEX)

Question

I\'m trying to deploy an application that works fine on my development pc and some other workstations. However, some users receive an error that I can\'t seem to grasp.

Answer 1

You can check if worksheets are not present then add them. Usually first worksheet is created by default and you can check rest as below. I had similar issue and resolved as below.

           // Add Worksheet 2 if not present
            if (workbook.Worksheets.Count < 2)
            {
                workbook.Worksheets.Add();
            }

            // Add Worksheet 3 if not present
            if (workbook.Worksheets.Count < 3)
            {
                workbook.Worksheets.Add();
            }

Answer 2

I spoke too soon! This is just a really dumb error. I thought I'd give the solution so others might not fall into the same trap as I did ;-)

To analyse the problem further, I added following code to the constructor:

List<XLS.Worksheet> sheets = new List<XLS.Worksheet>()
foreach(XLS.Worksheet sh in _WSs)
{
    sheets.Add(sh);
}
if(_OnXLSEvent != null) _OnXLSEvent(String.Format("\n\tSheets in WB: {0}\n\tFirst Sheet index: {1}, \n\tLast Sheet index: {2}",
                                                  _WSs.Count,
                                                  sheets[0].Index,
                                                  sheets.Last().Index));

This resulted in following log on my machine:

Sheets in WB: 3
First Sheet index: 1, 
Last Sheet index: 3

But in following log on the target machine:

Sheets in WB: 1
First Sheet index: 1, 
Last Sheet index: 1

Conclusion: the amount of worksheets that are standard added to a new workbook differ from user to user. Something to keep in mind!