/IZWebFileManager/ThumbnailHandler.cs

using System;

using System.Collections.Generic;

using System.Text;

using System.Web;

using System.Drawing;

using System.Drawing.Imaging;



namespace IZ.WebFileManager

{

    public class ThumbnailHandler : IHttpHandler

    {

        public bool IsReusable

        {

            get { return true; }

        }



        public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "image/jpeg";

            int size = 92;



            string vPath = HttpUtility.UrlDecode(context.Request.Url.Query.Substring(1));

            string path = context.Request.MapPath(vPath);



            using (var original = Image.FromFile(path))

            {

                if (original.Width > size || original.Height > size)

                {

                    int tw = original.Width > original.Height ? size : (original.Width * size) / original.Height;

                    int th = original.Width > original.Height ? (original.Height * size) / original.Width : size;



                    using (var thumb = original.GetThumbnailImage(tw, th, null, IntPtr.Zero))

                    {

                        thumb.Save(context.Response.OutputStream, ImageFormat.Jpeg);



                    }

                }

                else

                {

                    original.Save(context.Response.OutputStream, ImageFormat.Jpeg);

                }

            }



        }

    }

}