读取Excel数据到Table表中

方法一：

            try
            {
                List<DBUtility.CommandInfo> list = new List<DBUtility.CommandInfo>();

                string strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + path + ";Extended Properties='Excel 12.0; HDR=YES; IMEX=1'"; //此连接可以操作.xls与.xlsx文件
                using (OleDbConnection conn = new OleDbConnection(strConn))
                {
                    conn.Open();
                    DataTable sheetsName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });  //得到所有sheet的名字 
                    string SheetName = sheetsName.Rows[0][2].ToString();
                    string strSQL = string.Format("SELECT * FROM [{0}]", SheetName);
                    OleDbDataAdapter oda = new OleDbDataAdapter(strSQL, strConn);
                    DataTable dt = new DataTable();
                    oda.Fill(dt);

                    if (dt.Rows.Count > 0)
                    {
                        DateTime date = DateTime.Parse(System.DateTime.Now.ToString());
                        string year = date.ToString("yyyy");
                        string month = date.ToString("MM");
                        string proName = dt.Rows[0][1].ToString().Substring(5);
                        strSQL = "insert into tb_targetcostlist (gcmc,Date,UserID) values('" + proName + "','" + date + "','" + Session["UserId"] + "');select @@identity;";
                        string proID = DBUtility.DbHelperSQL.GetSingle(strSQL).ToString();
                        for (int i = 1; i < dt.Rows.Count; i++)
                        {
                            DBUtility.CommandInfo item = new DBUtility.CommandInfo();
                            item.CommandText = "insert into tb_MonthlyCost (Num, ProClassification, ProName, Unit, Quantity, UnitPrice, TotalPrice, MonthPlanCost, MonthActuallyCost_GJ, MonthActuallyCost_JD, MonthProfitAndLoss, TotalPlanCost, TotalActuallyCost_GJ, TotalActuallyCost_JD, ProTotalCost, TotalProfitAndLoss, EvenCost, ContractPrice, ProfitAndLoss, Others, Month,Year,proID)";
                            item.CommandText += "values(";
                            item.CommandText += "'" + dt.Rows[i][0].ToString() + "','" + dt.Rows[i][1].ToString() + "','" + dt.Rows[i][2].ToString() + "','" + dt.Rows[i][3].ToString() + "','" + dt.Rows[i][4].ToString() + "','" + dt.Rows[i][5].ToString() + "','" + dt.Rows[i][6].ToString() + "','" + dt.Rows[i][7].ToString() + "','" + dt.Rows[i][8] + "','" + dt.Rows[i][9].ToString() + "','" + dt.Rows[i][10].ToString() + "','" + dt.Rows[i][11].ToString() + "','" + dt.Rows[i][12].ToString() + "','" + dt.Rows[i][13].ToString() + "','" + dt.Rows[i][14].ToString() + "','" + dt.Rows[i][15].ToString() + "','" + dt.Rows[i][16].ToString() + "','" + dt.Rows[i][17].ToString() + "','" + dt.Rows[i][18].ToString() + "','" + dt.Rows[i][19].ToString() + "','" + month + "','" + year + "','" + proID + "'";
                            item.CommandText += ")";
                            list.Add(item);
                            DBUtility.DbHelperSQL.ExecuteSqlTran(list);
                            item.CommandText = "";
                        }
                    }
                }

            }
            catch (Exception ex)
            {
                Page.RegisterStartupScript("", "<script>alert('" + ex.Message + "');</script>");
            }

方法二：

此方法弊端：每次都会产生一个EXCEL.exe进程，下次再运行，要不这个进程关闭才行，非常不方便

        private void ReadExcelToTable(string path)
        {
            Microsoft.Office.Interop.Excel.Application oXL;
            Microsoft.Office.Interop.Excel._Workbook oWB;
            Microsoft.Office.Interop.Excel._Worksheet oSheet;
            object missing = System.Type.Missing;

            //创建Excel实例
            oXL = new Microsoft.Office.Interop.Excel.Application();

            //打开已有的工作簿
            oWB = oXL.Workbooks.Open(path, missing, missing, missing, missing, missing, missing,
                missing, missing, missing, missing, missing, missing, missing, missing);

            //导入服务器的连接
            String strcon = "Data Source=192.168.1.245;Initial Catalog=Component;User ID=sa;Password=yuxit2008";
            using (SqlConnection objcon1 = new SqlConnection(strcon))
            {
                objcon1.Open();

                for (int i = 1; i <= oWB.Sheets.Count; i++)
                {
                    oSheet = (Microsoft.Office.Interop.Excel.Worksheet)oWB.Sheets.get_Item(i);
                    //tb_targetcostlist中插入标题，项目名称等
                    DateTime date = DateTime.Parse(System.DateTime.Now.ToString());
                    string year = date.ToString("yyyy");
                    string month = date.ToString("MM");
                    string proName = GetCellText(2, 2, oSheet).Substring(5);
                    string title = GetCellText(1, 1, oSheet);
                    string strSQL = "insert into tb_targetcostlist(gcmc,Title,Date,UserID) values('" + proName + "','" + title + "','" + date + "','" + Session["UserId"] + "');select @@identity;";
                    string proID = DBUtility.DbHelperSQL.GetSingle(strSQL).ToString();


                    // 从第二行开始遍历 行、列 数据
                    for (int j = 2; j <= oSheet.UsedRange.Rows.Count; j++)
                    {
                        string str = "";
                        for (int n = 1; n < oSheet.UsedRange.Columns.Count; n++)
                        {
                            str += "'" + GetCellText(j, n, oSheet) + "',";
                        }
                        string strinsert = @"insert into tb_MonthlyCost( Num, ProClassification, ProName, Unit, Quantity, UnitPrice, TotalPrice, MonthPlanCost, MonthActuallyCost_GJ, MonthActuallyCost_JD, MonthProfitAndLoss, TotalPlanCost, TotalActuallyCost_GJ, TotalActuallyCost_JD, ProTotalCost, TotalProfitAndLoss, EvenCost, ContractPrice, ProfitAndLoss, Others,Year,Month,ProID)" +
                                     " values(" + str + "'" + year + "','" + month + "','" + proID + "')";

                        using (SqlCommand objcom = new SqlCommand(strinsert, objcon1))
                        {
                            objcom.ExecuteNonQuery();
                        }

                    }
                }
            } 
        }
         ///<summary>
         ///获取单元格文本
         ///</summary>
         ///<param name="row"></param>
         ///<param name="col"></param>
         ///<param name="oSheet"></param>
         ///<returns></returns>
        private string GetCellText(int row, int col, Microsoft.Office.Interop.Excel._Worksheet oSheet)
        {
            string result = "";
            bool isFound = false;
            int rowEnd = 1;
            int colEnd = 1;

            Microsoft.Office.Interop.Excel.Range oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[row, col];
            if (oRng.Value2 != null)
            {
                result = oRng.Value2.ToString();
                isFound = true;
            }
            else
            {
                if (!(bool)oRng.MergeCells)    // 如果该单元格无值且不是合并的，则返回 null
                {
                    result = null;
                    isFound = true;
                }
            }
            if (!isFound)
            {
                // 倒序遍历该列所有行(从倒2行开始)，判断是否有合并单元格且有值，如果遇到则已求出，
                // 如果遇到非合并单元格，则行+1(倒回1行)，列同样倒序进行
                for (int r = row - 1; r >= 1; r--)
                {
                    oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[r, col];
                    if ((bool)oRng.MergeCells)
                    {
                        try
                        {
                            if (oRng.Value2 != null)
                            {
                                result = oRng.Value2.ToString();
                                isFound = true;
                                break;
                            }
                        }
                        catch (Exception)
                        { }
                    }
                    else
                    {
                        rowEnd = r + 1;
                        break;
                    }
                }
                if (!isFound)
                {
                    // 倒序遍历该行所有列，判断是否有合并单元格且有值，如果遇到则已求出，如果遇到非合并单元格，则说明数据非法。。。
                    for (int c = col - 1; c >= 1; c--)
                    {
                        oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[rowEnd, c];
                        if ((bool)oRng.MergeCells)
                        {
                            try
                            {
                                if (oRng.Value2 != null)
                                {
                                    result = oRng.Value2.ToString();
                                    isFound = true;
                                    break;
                                }
                            }
                            catch (Exception)
                            { }
                        }
                        else
                        {
                            colEnd = c + 1;
                            break;
                        }
                    }
                }
                if (!isFound)
                {
                    result = null;
                }
            }
            return result;
        }

方法三（重点）：

使用NPOI读取单元格。对于合并单元格：相同值，读取多次，存储到数据库表中

        private void ReadExcelToTable(string path)
        {        
            using (FileStream fs=File.Open(path,FileMode.Open))
            {
                using (Workbook wk=new HSSFWorkbook(fs))
                {
                    for (int i = 0; i < wk.NumberOfSheets; i++)
                    {
                        using (Sheet sheet = wk.GetSheetAt(i))
                        {
                            //tb_targetcostlist中插入标题，项目名称等
                            DateTime date = DateTime.Parse(System.DateTime.Now.ToString());
                            string year = date.ToString("yyyy");
                            string month = date.ToString("MM");
                            Cell cell_title = sheet.GetRow(0).GetCell(0);
                            Cell cell_proName = sheet.GetRow(1).GetCell(1);
                            Cell cell_monthly=sheet.GetRow(1).GetCell(9);
                            Cell cell_total=sheet.GetRow(1).GetCell(13);
                            string proName = getCellValue(cell_proName).Substring(5);
                            string title = getCellValue(cell_title);
                            string monthlyProduct=getCellValue(cell_monthly);
                                string totalProduct=getCellValue(cell_total);
                                string strSQL = "insert into tb_targetcostlist(ProName, Title, Date, UserID,MonthlyProduct,TotalProduct) values('" + proName + "','" + title + "','" + date + "','" + Session["UserId"] + "','" + monthlyProduct + "','" + totalProduct + "');select @@identity";
                            string proID = DBUtility.DbHelperSQL.GetSingle(strSQL).ToString();

                                   //从第3行开始遍历
                            for (int j = 2; j <= sheet.LastRowNum; j++)
                            {
                                string value = "";
                                Row curRow = sheet.GetRow(j);
                                if (curRow != null)
                                {
                                    for (int m = 0; m < 19; m++)
                                    {
                                        Cell cell = curRow.GetCell(m);
                                        if (cell != null)
                                        {
                                            if (isMergedRegion(sheet, j, m))
                                            {
                                                value += "'" + getMergedRegionValue(sheet, j, m) + "',";
                                            }
                                            else
                                            {
                                                value += "'" + getCellValue(cell) + "',";
                                            }
                                        }
                                        else
                                        {
                                            value += "'',";
                                        }

                                    }

                                    string strinsert = @"insert into tb_MonthlyCost( Num, ProClassification, ItemName, Unit, Quantity, UnitPrice, TotalPrice, MonthPlanCost, MonthActuallyCost_GJ, MonthActuallyCost_JD, MonthProfitAndLoss, TotalPlanCost, TotalActuallyCost_GJ, TotalActuallyCost_JD, ProTotalCost, TotalProfitAndLoss, EvenCost, ContractPrice, ProfitAndLoss,Year,Month,ProID)" +
                                         " values(" + value + "'" + year + "','" + month + "','" + proID + "')";

                                    DBUtility.DbHelperSQL.GetSingle(strinsert);
                                }                        
                            }
                        }
                    }
                }
            }
        }
        /// <summary>
        /// 获取合并单元格的值
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="row"></param>
        /// <param name="column"></param>
        /// <returns></returns>

        public String getMergedRegionValue(Sheet sheet, int row, int column)
        {
            int sheetMergeCount = sheet.NumMergedRegions;

            for (int i = 0; i < sheetMergeCount; i++)
            {
                CellRangeAddress ca = sheet.GetMergedRegion(i);
                int firstColumn = ca.FirstColumn;
                int lastColumn = ca.LastColumn;
                int firstRow = ca.FirstRow;
                int lastRow = ca.LastRow;

                if (row >= firstRow && row <= lastRow)
                {

                    if (column >= firstColumn && column <= lastColumn)
                    {
                        Row fRow = sheet.GetRow(firstRow);
                        Cell fCell = fRow.GetCell(firstColumn);

                        return getCellValue(fCell);
                    }
                }
            }
            return null;
        }


        /// <summary>
        /// 判断指定的单元格是否是合并单元格
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="row"></param>
        /// <param name="column"></param>
        /// <returns></returns>    
        public bool isMergedRegion(Sheet sheet, int row, int column)
        {
            int sheetMergeCount = sheet.NumMergedRegions;

            for (int i = 0; i < sheetMergeCount; i++)
            {
                CellRangeAddress ca = sheet.GetMergedRegion(i);
                int firstColumn = ca.FirstColumn;
                int lastColumn = ca.LastColumn;
                int firstRow = ca.FirstRow;
                int lastRow = ca.LastRow;

                if (row >= firstRow && row <= lastRow)
                {
                    if (column >= firstColumn && column <= lastColumn)
                    {
                        return true;
                    }
                }
            }

            return false;
        }

        /// <summary>
        /// 获取单元格的值
        /// </summary>
        /// <param name="cell"></param>
        /// <returns></returns>
        public String getCellValue(Cell cell)
        {

            if (cell == null) return "";

            if (cell.CellType == CellType.STRING)
            {
                return cell.StringCellValue;
            }
            else if (cell.CellType == CellType.BOOLEAN)
            {
                return cell.BooleanCellValue.ToString();
            }
            else if (cell.CellType == CellType.FORMULA)
            {
　　　　　　　　　//此处注意，对于通过公式计算出来的单元格值，返回值为cell.NumericCellValue.ToString();
                return cell.NumericCellValue.ToString();
            }
            else if (cell.CellType == CellType.NUMERIC)
            {
                return cell.NumericCellValue.ToString();
            }
            return ""; 

        }