Generating image thumbnails in ASP.NET?

This has done me fine for years:

public static void CreateThumbnail(string filename, int desiredWidth, int desiredHeight, string outFilename){    using (System.Drawing.Image img = System.Drawing.Image.FromFile(filename))    {        float widthRatio = (float)img.Width / (float)desiredWidth;        float heightRatio = (float)img.Height / (float)desiredHeight;        // Resize to the greatest ratio        float ratio = heightRatio > widthRatio ? heightRatio : widthRatio;        int newWidth = Convert.ToInt32(Math.Floor((float)img.Width / ratio));        int newHeight = Convert.ToInt32(Math.Floor((float)img.Height / ratio));        using (System.Drawing.Image thumb = img.GetThumbnailImage(newWidth, newHeight, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailImageAbortCallback), IntPtr.Zero))        {            thumb.Save(outFilename, System.Drawing.Imaging.ImageFormat.Jpeg);        }    }}public static bool ThumbnailImageAbortCallback(){    return true;}

For intensive server-side code, I suggest you use other techniques than GDI+ that has not been designed to handle images chunk by chunk (in a streaming manner).

You can use Windows Imaging Component or WPF for this task. There is a very good example on how to do this in a fast and - more important - scalable manner here:

The fastest way to resize images from ASP.NET. And it’s (more) supported-ish.

I use ImageMagick for photo processing

UPDATED

Model:

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.IO;using ImageMagickObject;namespace photostorage.Models{    public class PhotoProcessing    {        public MagickImage ResizeImg(string filepath, string filename)        {            Object[] rotate = new Object[] { filepath + "/" + filename,                 "-auto-orient", filepath + "/" + filename };            Object[] big = new Object[] { filepath + "/" + filename,                 "-resize", "800", filepath + "/" + "big_" + filename };            Object[] middle = new Object[] { filepath + "/big_" + filename,                 "-resize", "400", filepath + "/" + "mid_" + filename };            Object[] small = new Object[] { filepath + "/mid_" + filename,                 "-resize", "200", filepath + "/" + "small_" + filename };            Object[] crop = new Object[] { filepath + "/small_" + filename,                 "-resize", "50", filepath + "/" + "crop_" + filename };            ImageMagickObject.MagickImage img =                 new ImageMagickObject.MagickImage();            img.Convert(rotate);            img.Convert(big);            img.Convert(middle);            img.Convert(small);            img.Convert(crop);            return img;        }    }}

Controller:

PhotoProcessing resizeImg = new PhotoProcessing();[HttpPost]public string Index(params,params,params...){    var GetResize = resizeImg.ResizeImg(        destinationFolder + "/" + curFolder, fullFileName);}