MVC中简单的文件下载代码

        /// <summary>
        /// 文件下载
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public FileStreamResult DownLoadFile(string filePath,string fileName)
        {
            Stream stream = null;
            try
            {
                if (System.IO.File.Exists(filePath))
                {
                    stream = new FileStream(Server.MapPath(filePath), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                    if (stream != null)
                    {
                        return File(stream, "application/octet-stream", Url.Encode(fileName));
                    }
                    else
                    {
                        throw new Exception("文件不存在!");
                    }
                }
                else
                {
                    throw new Exception("文件不存在!");
                }
            }
            catch(Exception exc)
            {
                throw new Exception("");
            }
        }

        public void Download()
        {
            Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(Path.GetFileName(Server.UrlDecode(Request["filepath"]))));
            Response.WriteFile(Server.MapPath(Server.UrlDecode(Request["filepath"])));
            Response.Flush();
            Response.End();
        }