MVC 使用FileResult导出Excel数据文件

public FileResult HtmlTOExcel(List<Survery> surveryList)
        {
            var sbHtml = new StringBuilder();
            Html.Append("<table border=‘1‘ cellspacing=‘0‘ cellpadding=‘0‘>");
            Html.Append("<tr>");
            var list= new List<string> { "编号", "题目", "创建时间" };
            foreach (var item in list)
            {
                Html.AppendFormat("<td>{0}</td>", item);
            }
            Html.Append("</tr>");

            foreach (var s in surveryList)
            {
                Html.Append("<tr>");
                Html.AppendFormat("<td>{0}</td>", s.Id);
                Html.AppendFormat("<td>{0}</td>", s.Title);
                Html.AppendFormat("<td>{0}</td>", DateTime.Now);
                Html.Append("</tr>");
            }
            Html.Append("</table>");

            //使用FileContentResult
            byte[] fileContents = Encoding.Default.GetBytes(Html.ToString());
            string filename="调查列表"+DateTime.Now.tos("yyyy-MM-dd")+".xls";
            return File(fileContents, "application/ms-excel",filename);
       }