下载EXCEL （等待完整）

public static void excelbase()
    {

        string filename = System.DateTime.Now.Year.ToString() + System.DateTime.Now.Month.ToString() + System.DateTime.Now.Day.ToString() + System.DateTime.Now.Hour.ToString() + System.DateTime.Now.Second.ToString() + System.DateTime.Now.Millisecond.ToString() + ".xls";
        try
        {
            string style = @"<style> td { mso-number-format:\@; } </style>";
            
         HttpContext.Current.Response.Clear();
         HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename + "");
         HttpContext.Current.Response.ContentType = "application/ms-excel";
         HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF7;
            // Response.Charset = "utf-8";
            //  Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);

           
            stringWrite.WriteLine(style);
           // gvAsset.RenderControl(htmlWrite);
            HttpContext.Current.Response.Write(stringWrite.ToString());
            HttpContext.Current.Response.End();
        }
        catch (Exception ex)
        {
            // throw new Exception(ex.Message.ToString());
        }

    }