.net 导出Excel

            CreateExcel(ExcelDs, "1", f);

void CreateExcel(DataSet ds, string typeid, string FileName)
        {

            HttpResponse resp = System.Web.HttpContext.Current.Response;

            // Response.ContentEncoding

            resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
            resp.Charset = "UTF-8";

            string colHeaders = "", ls_item = "";
            int i = 0;

            //定义表对象与行对像，同时用DataSet对其值进行初始化
            DataTable dt = ds.Tables[0];
            DataRow[] myRow = dt.Select("");
            // typeid=="1"时导出为EXCEL格式文件；typeid=="2"时导出为XML格式文件
            if (typeid == "1")
            {

                resp.ContentType = "application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword
                //取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符
                for (i = 0; i < dt.Columns.Count - 1; i++)
                    colHeaders += GetColumnNamePinYin(dt.Columns[i].Caption).ToString() + "\t";
                colHeaders += GetColumnNamePinYin(dt.Columns[i].Caption).ToString() + "\n";
                //向HTTP输出流中写入取得的数据信息
                resp.Write(colHeaders);
                //逐行处理数据 
                foreach (DataRow row in myRow)
                {
                    //在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n
                    for (i = 0; i < dt.Columns.Count - 1; i++)
                    {
                        if (row[i].ToString().Length == 15)
                            ls_item += row[i].ToString().Replace("\t", "") + "帆" + "\t";
                        else if (row[i].ToString().Contains("-") && row[i].ToString().Contains(":"))
                        {
                            ls_item += Convert.ToDateTime((row[i])).ToString("yyyy-MM-dd").Replace("\t", "") + "\t";

                        }
                        else
                            ls_item += row[i].ToString().Replace("\t", "") +""+ "\t";

                    }

                    // ls_item += GetKeFuByPinYin(row[i].ToString()).Replace("\t", "") + "\n";

                    ls_item += row[i].ToString().Replace("\t", "") + "\n";

                    //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据   
                    resp.Write(ls_item);
                    ls_item = "";
                }
            }
            else
            {
                if (typeid == "2")
                {
                    //从DataSet中直接导出XML数据并且写到HTTP输出流中
                    resp.Write(ds.GetXml());
                }
            }
            //写缓冲区中的数据到HTTP头文件中
            resp.End();
        }