用npoi生成excel

用npoi生成excel的文章已经有很多，我这就不多说了，今天主要的目的就是把我写的例子贴出来和大家分享

如果有不明白的地方，可以联系我

public static string ExportExcel(DataTable dtSource, string AppSettingPath,string Aid)
        {
            try
            {
                string AdPath = string.Empty;
                string FileName = string.Empty;
                HSSFWorkbook workbook = new HSSFWorkbook();
                HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();
                //填充表头
                HSSFRow dataRow = (HSSFRow)sheet.CreateRow(0);
                foreach (DataColumn column in dtSource.Columns)
                {
                    dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName == "");
                }


                //填充内容
                for (int i = 0; i < dtSource.Rows.Count; i++)
                {
                    dataRow = (HSSFRow)sheet.CreateRow(i + 1);
                    for (int j = 0; j < dtSource.Columns.Count; j++)
                    {
                        dataRow.CreateCell(j).SetCellValue(dtSource.Rows[i][j].ToString());
                    }
                }


                //保存
                using (MemoryStream ms = new MemoryStream())
                {
                    // FileName=DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls";
                    FileName = Aid + ".xls";
                    AdPath = System.Web.HttpContext.Current.Server.MapPath(AppSettingPath) + FileName;
                    using (FileStream fs = new FileStream(AdPath, FileMode.Create, FileAccess.Write))
                    {
                        workbook.Write(fs);
                    }
                }
                workbook.Dispose();
                if (FileName != string.Empty)
                { return CmsUrl + AppSettingPath + FileName; }
                else { return string.Empty; }
            }
            catch(Exception ex)
            {
                throw new Exception(ex.Message,ex);
            }
        }

这边 HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet(); 有用到个类型转换，如果不强制转换，会报错，网上的很多demo就是因为没有转换，所有在run的时候，报错了..