<a href="Handler1.ashx" download="123.jpeg">下載而不是開啟</a>

前端a標籤

public void ProcessRequest(HttpContext context)
        {
            Bitmap img = GetBitmap("http://伺服器圖片url.jpeg");
            MemoryStream ms = new MemoryStream();
            img.Save(ms, ImageFormat.Jpeg);
            context.Response.ClearContent();
            context.Response.ContentType = "Image/Jpeg";
            context.Response.BinaryWrite(ms.ToArray());
        }


        public Bitmap GetBitmap(string url)
        {
            if (String.IsNullOrEmpty(url))
                return null;
            else
            {
                try
                {
                    url = url.Replace(" ", "%20");
                    url = url.Replace("&", "&");
                }
                catch { }
            }
            Bitmap bitmap = null;
            HttpWebRequest myRequest = null;
            HttpWebResponse myResponse = null;
            Stream responseStream = null;
            try
            {
                myRequest = (HttpWebRequest)WebRequest.Create(url);
                myRequest.Timeout = 15 * 1000;
                myRequest.CookieContainer = new CookieContainer();
                myResponse = (HttpWebResponse)myRequest.GetResponse();
                responseStream = myResponse.GetResponseStream();
                Image image = Image.FromStream(responseStream);
                bitmap = new Bitmap(image);
            }
            catch { }
            finally
            {
                if (myResponse != null)
                {
                    myResponse.Close();
                }
                if (responseStream != null)
                {
                    responseStream.Close();
                }
                if (myRequest != null)
                {
                    myRequest.Abort();
                }
            }
            return bitmap;
        }
 

處理程式