/IZWebFileManager/ThumbnailHandler.cs

 1using System;
 2using System.Collections.Generic;
 3using System.Text;
 4using System.Web;
 5using System.Drawing;
 6using System.Drawing.Imaging;
 7
 8namespace IZ.WebFileManager
 9{
10    public class ThumbnailHandler : IHttpHandler
11    {
12        public bool IsReusable
13        {
14            get { return true; }
15        }
16
17        public void ProcessRequest(HttpContext context)
18        {
19            context.Response.ContentType = "image/jpeg";
20            int size = 92;
21
22            string vPath = HttpUtility.UrlDecode(context.Request.Url.Query.Substring(1));
23            string path = context.Request.MapPath(vPath);
24
25            using (var original = Image.FromFile(path))
26            {
27                if (original.Width > size || original.Height > size)
28                {
29                    int tw = original.Width > original.Height ? size : (original.Width * size) / original.Height;
30                    int th = original.Width > original.Height ? (original.Height * size) / original.Width : size;
31
32                    using (var thumb = original.GetThumbnailImage(tw, th, null, IntPtr.Zero))
33                    {
34                        thumb.Save(context.Response.OutputStream, ImageFormat.Jpeg);
35
36                    }
37                }
38                else
39                {
40                    original.Save(context.Response.OutputStream, ImageFormat.Jpeg);
41                }
42            }
43
44        }
45    }
46}