C# Winform Excel的导出，根据excel模板导出数据

namespace dxhbskymDemo
{
    public partial class ExcelForm : DevExpress.XtraEditors.XtraForm
    {
       public ExcelForm()
        {
            InitializeComponent();

        }
       #region 导出Excel

       //导出按钮
        private void sbtnDaochu_Click(object sender, EventArgs e)
        {
            string fileName = "";//要保存的excel文件名
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "导出1997-2003版本Excel(*.xls)|*.xls,导出2007版本Excel(*.xlsx)|*.xlsx";

　　　　　　　//扩展名 sfd.FileName = "河北省项目汇总表";//  if (sfd.ShowDialog() == DialogResult.OK) { fileName = sfd.FileName; //导入  outPutExcel(fileName); } } 

    //导出Excel的方法
        private void outPutExcel(string saveFilepath)
        {
            bool isShowExcel = false;

            DataTable dt = new DataTable();//将数据库取出的数据源转成DataTable

            if (dt == null)
            {
                return;
            }
            if (dt.Rows.Count == )
            {
                return;
            }
            Missing miss = Missing.Value;
            Excel.Application xlApp = new Excel.Application();

            if (xlApp == null)
            {
                XtraMessageBox.Show("请确保您的电脑已经安装Excel！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            //xlApp.UserControl = true;
            Excel.Workbooks workBooks = xlApp.Workbooks;
            //Excel.Workbook workBook = workBooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);//创建新的
            Excel.Workbook workBook = workBooks.Add(System.AppDomain.CurrentDomain.BaseDirectory + "excel\\项目汇总表.xls");//根据现有excel模板产生新的Workbook
            Excel.Worksheet workSheet = (Excel.Worksheet)workBook.Worksheets[];//获取sheet1
 xlApp.DisplayAlerts = false;//保存Excel的时候，不弹出是否保存的窗口直接进行保存
workSheet.get_Range("A3", "B3").Merge(workSheet.get_Range("A3", "B3").MergeCells);//合并单元格
            if (workSheet == null)
            {
                XtraMessageBox.Show("请确保您的电脑已经安装Excel！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            try
            {
                Excel.Range range=null;
                xlApp.Visible = isShowExcel;//若是true,则在导出的时候会显示excel界面
                int totalCount = dt.Rows.Count;

                workSheet.Cells[, ] = "河北省石家庄市项目汇总表";//导出标题

                //写入数值
                for (int i = ; i < dt.Rows.Count; i++)
                {
                    workSheet.Cells[i + , ] = dt.Rows[i]["xmxh"];//项目序号

                    //workSheet.Cells[5,1]=””;//表示第五行与第一列交点的那个单元格坐标                    

                    workSheet.Cells[i + , ] = dt.Rows[i]["xmmc"];//项目名称
                 ((Excel.Range)workSheet.Cells[i+4, 2]).ColumnWidth = 12;//设置列宽

                    workSheet.Cells[i + , ] = dt.Rows[i]["bz"];//备注

                }

　　　　　　　　　　//计算sum和
　　　　　　　　　　Excel.Range range2 = workSheet.get_Range("C9", Type.Missing);
　　　　　　　　　　range2.Formula = "=SUM(C4:C8)"; 
　　　　　　　　　　range2.Calculate();

　　　　　　　　　workBook.SaveAs(saveFilepath,Type.Missing,Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                //workSheet.SaveAs(saveFilepath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                workBooks.Close();

            }
            catch (Exception ex)
            {
                XtraMessageBox.Show("Excel导出失败，错误：" + ex.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                xlApp.Quit();
                regExpre.KillExcelProcess();
            }
            finally
            {
                xlApp.Quit();
                regExpre.KillExcelProcess();
            }
        }

        #endregion

    }
}