excel导出功能第二种方法

  public static void Export(DataTable Dt, string FileName, HttpResponse Response, bool AppendHeader)
        {
            StringBuilder sb = new StringBuilder();
            int countOfColumns = Dt.Columns.Count;
            int countOfRows = Dt.Rows.Count;
            if (AppendHeader)
            {
                for (int indexOfCl = 0; indexOfCl < countOfColumns - 1; indexOfCl++)
                {
                    sb.Append(Dt.Columns[indexOfCl] + "\t");
                }
                if (countOfColumns > 0)
                {
                    sb.Append(Dt.Columns[countOfColumns - 1] + "\n");
                }
            }
            for (int indexOfRow = 0; indexOfRow < countOfRows; indexOfRow++)
            {
                for (int indexOfCl = 0; indexOfCl < countOfColumns; indexOfCl++)
                {
                    sb.Append(Dt.Rows[indexOfRow][indexOfCl] + "\t");
                }
                sb.Append("\n");
            }
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.ContentType = "application/octet-stream";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Convert.ToString(FileName), System.Text.Encoding.UTF8));
            Response.Write(sb.ToString());
            Response.Flush();
            Response.End();
        }

 var data1 = from f in siteData.已投稿列表
                                where (BeginTime.Value.Trim() != "" && EndTime.Value.Trim() != "") ?
                                (f.SubmittedDate >= Convert.ToDateTime(BeginTime.Value.Trim()))
                                && f.SubmittedDate <= Convert.ToDateTime(EndTime.Value.Trim()).AddDays(1) : 1 == 1
                                where f.Department == UserDept
                                group f by f.Department into g
                                where keyword != "" ? g.Key != null ? g.Key.Contains(keyword) : 3 == 3 : 2 == 2
                                orderby g.Count() descending
                                select new
                                {
                                    类别 = g.Key == null ? "无部门" : g.Key,
                                    文章次数 = g.Count(),
                                    已采纳数 = g.Count(o => o.HandleState == "实际采用")
                                };
                    if (data1 != null)
                    {
                        DataTable dt = new DataTable();
                        dt.Columns.Add("部门", typeof(string));
                        dt.Columns.Add("投稿数量", typeof(string));
                        dt.Columns.Add("已采纳数", typeof(string));
                        dt.Rows.Add(new object[] { "部门", "投稿数量", "已采纳数" });
                        for (int i = 0; i < data1.Count(); i++)
                        {
                            dt.Rows.Add(new object[] { data1.ElementAt(i).类别, data1.ElementAt(i).文章次数, data1.ElementAt(i).已采纳数 });

                        }
                        CoolFuncs.Export(dt, "部门投稿统计.xls", Response, false);
                    }