public partial class Download : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            try            {                if (!String.IsNullOrEmpty(Request["mid"]))                {                    MediaItem mi = Sitecore.Context.Database.GetItem(new ID(Request["mid"]));                    Stream fileStream = mi.GetMediaStream();                    byte[] buffer = new byte[fileStream.Length];                    fileStream.Read(buffer, 0, (int)fileStream.Length);                     fileStream.Close();                    Response.ContentType = mi.MimeType;                    Response.AddHeader("content-disposition", "attachment; filename=" + mi.DisplayName + "." + mi.Extension);                    Response.BinaryWrite(buffer);                    Response.Flush();                    Response.End();                }                else                {                    if (String.IsNullOrEmpty(Request["fileUrl"]) || String.IsNullOrEmpty(Request["fileType"]))                    {                        Page.ClientScript.RegisterStartupScript(Page.GetType(), "script", "<script type=‘text/javascript‘>alert(‘下载失败‘);window.opener=null;window.open(‘‘,‘_self‘); window.close();</script>");                    }                    else                    {                        string url = "http://" + System.Web.HttpContext.Current.Request.Url.Host.ToString() + ":" + System.Web.HttpContext.Current.Request.Url.Port.ToString() + Request["fileUrl"];                        WebClient my = new WebClient();                        byte[] mybyte;                        mybyte = my.DownloadData(url);                        MemoryStream ms = new MemoryStream(mybyte);                        //下面直接输出                        Response.ClearContent();                        Response.ContentType = "application/x-msdownload";                        string filename = "attachment; filename=" + DateTime.Now.ToString("yyyyMMddHHmmssffff") + Request["fileType"];                        Response.AddHeader("Content-Disposition", filename);                        Response.BinaryWrite(mybyte);                        Response.Flush();                        Response.End();                    }                }            }            catch            {                Page.ClientScript.RegisterStartupScript(Page.GetType(), "script", "<script type=‘text/javascript‘>alert(‘下载失败‘);window.opener=null;window.open(‘‘,‘_self‘); window.close();</script>");            }        }    }