winform NPOI excel 导出并选择保存文件路径

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public void ExcelOp(DataGridView gdv,ArrayList selHead) {     if (selHead.Count==0)     {         MessageBox.Show("没有数据，无法导出EXCEL！");         return;     }       IWorkbook excel = new HSSFWorkbook();//创建.xls文件     ISheet sheet = excel.CreateSheet("sheet1"); //创建sheet     IRow row = sheet.CreateRow(0);     //创建行对象，填充表头     row.CreateCell(0).SetCellValue("月份");     row.CreateCell(1).SetCellValue("门\\病");     row.CreateCell(2).SetCellValue("科别");     row.CreateCell(3).SetCellValue("收入类别");     row.CreateCell(4).SetCellValue("姓名");           //写入文件 弹出文件保存     //string DesktopPath = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);//桌面路径     string filename = statistics_head.Text+ printDetailClass.GetUnixTime(DateTime.Now).ToString();//文件名     SaveFileDialog saveDialog = new SaveFileDialog();     saveDialog.DefaultExt = "xls";     saveDialog.Filter = "Excel文件|*.xls";     saveDialog.FileName = filename;     saveDialog.ShowDialog();     filename = saveDialog.FileName;     if (filename.IndexOf(":") < 0) return; //被点了取消     FileStream xlsfile = new FileStream(saveDialog.FileName, FileMode.Create);     excel.Write(xlsfile);     xlsfile.Close();     System.Diagnostics.Process.Start(filename); }