Programmatically getting the last filled excel row using C#

Question

I am trying to get the last row of an excel sheet programatically using the Microsoft.interop.Excel Library and C#. I want to do that, because I am charged with looping thr

Answer 1

This issue is even worse when there are possibly empty cells. But you have to read a row even if only one value is filled. It can take a while when there are a lot of unfilled cells but if the input is close to correct it is rather fast.

My solution ignores completely empty rows and returns the longest column's row count:

private static int GetLastRow(Worksheet worksheet)
    {
        int lastUsedRow = 1;
        Range range = worksheet.UsedRange;
        for (int i = 1; i < range.Columns.Count; i++)
        {
            int lastRow = range.Rows.Count;
            for (int j = range.Rows.Count; j > 0; j--)
            {
                if (lastUsedRow < lastRow)
                {
                    lastRow = j;
                    if (!String.IsNullOrWhiteSpace(Convert.ToString((worksheet.Cells[j, i] as Range).Value)))
                    {
                        if (lastUsedRow < lastRow)
                            lastUsedRow = lastRow;
                        if (lastUsedRow == range.Rows.Count)
                            return lastUsedRow - 1;
                        break;
                    }
                }
                else
                    break;
            }
        }
        return lastUsedRow;
    }