public static void CreateExcel(DataSet ds)
        {
            string filename = DateTime.Now.ToString("yyyyMMddHHmmssff") + ".xls";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename);
            string colHeaders = "", ls_item = "";

            //定義表對(duì)象與行對(duì)象，同時(shí)用DataSet對(duì)其值進(jìn)行初始化
            DataTable dt = ds.Tables[0];
            DataRow[] myRow = dt.Select();//可以類(lèi)似dt.Select("id>10")之形式達(dá)到數(shù)據(jù)篩選目的
            int i = 0;
            int cl = dt.Columns.Count;

            //取得數(shù)據(jù)表各列標(biāo)題，各標(biāo)題之間以/t分割，最后一個(gè)列標(biāo)題后加回車(chē)符
            for (i = 0; i < cl; i++)
            {
                if (i == (cl - 1))//最后一列，加/n
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "/n";
                }
                else
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "/t";
                }

            }
            HttpContext.Current.Response.Write(colHeaders);
            //向HTTP輸出流中寫(xiě)入取得的數(shù)據(jù)信息

            //逐行處理數(shù)據(jù) 
            foreach (DataRow row in myRow)
            {
                //當(dāng)前行數(shù)據(jù)寫(xiě)入HTTP輸出流，并且置空l(shuí)s_item以便下行數(shù)據(jù)   
                for (i = 0; i < cl; i++)
                {
                    if (i == (cl - 1))//最后一列，加/n
                    {
                        ls_item += row[i].ToString() + "/n";
                    }
                    else
                    {
                        ls_item += row[i].ToString() + "/t";
                    }

                }
                HttpContext.Current.Response.Write(ls_item);
                ls_item = "";

            }
            HttpContext.Current.Response.End();
        }