第1列为空时查找Excel文件的最后一行

Question

在开始阅读之前，我使用以下代码确定Excel文件的最后一行。如果column1值为空，则它不起作用。有没有办法检查所有行或第2行

            //Count number of rows
            range = (Excel.Range)xlWorkSheet.Cells[xlWorkSheet.Rows.Count, 1];

            //Get directoryname
            string directoryname = Path.GetDirectoryName(edifile);

            //Remove special characters
            string filenameNoExt = RemoveSpecialCharacters(Path.GetFileNameWithoutExtension(edifile));

            //Build Unique Guid Filename
            csvfile = path + filenameNoExt + "_" + Utilities.GetMyGUID();


            //xlUp will move up the worksheet to find the last cell with data.
            long lastRow = (long)range.get_End(Excel.XlDirection.xlUp).Row;