上传MySQL数据库的时候，为什么没有循环起来？

for (int i = rowIndex+1; i <= sheet.LastRowNum; i++)
{

                    NPOI.SS.UserModel.IRow row = sheet.GetRow(i);
                  
                    if (row == null) continue;
                    int firstCellNum = row.FirstCellNum;
                    int lastCellNum = row.LastCellNum;
                    if (firstCellNum == lastCellNum) continue;

                                        

                    for (int ji = firstCellNum; ji < lastCellNum; ji++)  //LastRowNum 是当前表的总行数
                    {

                        if (!dt.Columns.Contains(row.GetCell(ji).ToString()))
                        {
                            dt.Columns.Add(row.GetCell(ji).StringCellValue, typeof(string));
                        }
                       
                        if (row != null && row.GetCell(0) != null)
                        {
                            if (row.GetCell(0).ToString() != "")
                            {
                                string InvoiceNo = row.GetCell(0).ToString();
                                string CNo = row.GetCell(1).ToString();
                                string PartNo = row.GetCell(2).ToString();
                                string MurataType = row.GetCell(3).ToString();
                                string Country = row.GetCell(4).ToString();
                                string HsCode = row.GetCell(5).ToString();
                                string ChineseDescription = row.GetCell(6).ToString();
                                string CardNo = row.GetCell(7).ToString();
                                string CustomerPo = row.GetCell(8).ToString();
                                string Qty = row.GetCell(9).ToString();
                                string Unit = row.GetCell(10).ToString();
                                string GrossWeight = row.GetCell(11).ToString();
                                string NetWeight = row.GetCell(12).ToString();
                                string SalesPrice = row.GetCell(13).ToString();

                                ExcuSql += "INSERT INTO mflex_spl_data( invoice_no, c_no, part_no, murata_type, country, hs_code, chinese_description, card_no, customer_po, qty, unit, gross_weight, net_weight, sales_price,file_name,create_user,create_time) " +
                                           "VALUES( '" + InvoiceNo + "','" + CNo + "','" + PartNo + "','" + MurataType + "','" + Country + "','" + HsCode + "','" + ChineseDescription + "','" + CardNo + "','" + CustomerPo + "','" + Qty + "','" + Unit + "','" + GrossWeight + "','" + NetWeight + "','" + SalesPrice + "','" + FileName + "','edi',now());";
                            }
                        }

你这个判断，只有符合条件的才会执行，即便1000条数据，你这个判断，只有对第一条数据起作用