强制下载excel

        /// <summary>

        ///

        /// </summary>

        /// <param name="context"></param>

        /// <param name="filepath">导出的文件路径</param>

        /// <param name="filename"></param>

        public static void DownLoadFile(HttpContextBase context, string filepath,string filename)

        {

System.IO.FileInfo file = new System.IO.FileInfo(filepath);

            context.Response.Clear();

            context.Response.Charset = "GB2312";

            context.Response.ContentEncoding = System.Text.Encoding.UTF8;

            // 添加头信息，为"文件下载/另存为"对话框指定默认文件名

            context.Response.AddHeader("Content-Disposition", "attachment; filename=" + context.Server.UrlEncode(filename));

            // 添加头信息，指定文件大小，让浏览器能够显示下载进度

            context.Response.AddHeader("Content-Length", file.Length.ToString());
// 指定返回的是一个不能被客户端读取的流，必须被下载

            context.Response.ContentType = "application/ms-excel";
// 把文件流发送到客户端

            context.Response.WriteFile(file.FullName);
//System.IO.File.Delete(path + fileName);//删除临时文件
// 停止页面的执行

            context.Response.End();
}

强制下载excel