大家好，MVC项目怎么导出Excel，非常急多谢各位,

以前都是这样用，现在不提示下载！
   public void CreateExcel(DataTable dt, string fileName)
        {
      
                HttpResponse resp = System.Web.HttpContext.Current.Response;
                resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
                resp.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
                string colHeaders = "", ls_item = "";

                ////定义表对象与行对象，同时用DataSet对其值进行初始化
                //DataTable dt = ds.Tables[0];
                DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的
                int i = 0;
                int cl = dt.Columns.Count;

                //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 < 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";
                    }

                }
                resp.Write(colHeaders);
                //向HTTP输出流中写入取得的数据信息

                //逐行处理数据
                foreach (DataRow row in myRow)
                {
                    //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据  
                    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";
                        }

                    }
                    resp.Write(ls_item);
                    ls_item = "";

                }
                resp.End();
       
        }