DataSet 数据源导出Excel

        /// <summary>
        /// 
        /// </summary>
        /// <param name="ds"></param>
        /// <param name="typeid"></param>
        /// <param name="FileName"></param>
        public void CreateExcel(DataSet ds, string typeid, string FileName)
        {
            HttpResponse resp;
            resp = Page.Response;
            resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            resp.ContentType = "application/ms-excel";

            resp.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");

            this.EnableViewState = false;

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

            //定义表对象与行对象，同时使用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文件
            //导出excel 表格文件
            if (typeid == "1")
            {
                //取得数据表各列标题，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; i++)
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "\t";
                }
                colHeaders += "\n";

                resp.Write(colHeaders);
                //逐行处理数据
                foreach (DataRow row in myRow)
                {
                    //在当前行中，逐列取得数据，数据之间以\t分割，结束时加回车符\n
                    for (i = 0; i < dt.Columns.Count; i++)
                    {
                        if (i == 2)
                            row[i] = string.Format("{0:g}", Convert.ToDateTime(row[i]));
                        Is_item += "" + row[i].ToString() + "\t";
                    }
                    Is_item += "\n";
                    resp.Write(Is_item);
                    Is_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();

        }