Redimensionar Imagen en MVC

References

• Libro ASP.NET MVC with Entity Framework and CSS (Chapter 5)

---

namespace BabyStore
{
    public static class Constants
    {
        public const string ProductImagePath = "~/Content/ProductImages/";
        public const string ProductThumbnailPath = "~/Content/ProductImages/Thumbnails/";
    }
}

namespace BabyStore.Controllers
{
    public class ProductImagesController : Controller
    {
        public ActionResult Upload()
        {
            return View();
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Upload(HttpPostedFileBase file)
        {
            if (file != null)
            {
                if (ValidateFile(file))
                {
                    try
                    {
                        SaveFileToDisk(file);
                    }
                    catch (Exception)
                    {
                        ModelState.AddModelError(
                            "FileName",
                            "Sorry an error occurred saving the file to disk, please try again"
                        );
                    }
                }
                else
                {
                    ModelState.AddModelError(
                        "FileName",
                        "The file must be gift, png, pjeg or jpg and less than 2MB in size"
                    );
                }
            }
            else
            {
                ModelState.AddModelError("FileName", "Please choose a file");
            }
            if (ModelState.IsValid)
            {
                db.ProductImages.Add(new ProductImage { FileName = file.FileName });
            }
            return View();
        }

        private bool ValidateFile(HttpPostedFileBase file)
        {
            string fileExtension = System.IO.Path.GetExtension(file.FileName).ToLower();
            string[] allowedFileTypes = { ".gif", ".png", ".jpeg", ".jpj" };
            if ((file.ContentLength > 0 && file.ContentLength < 2097152) && allowedFileTypes.Contains(fileExtension))
            {
                return true;
            }
            return false;
        }

        private void SaveFileToDisk(HttpPostedFileBase file)
        {
            WebImage img = new WebImage(file.InputStream);
            if (img.Width > 190)
            {
                img.Resize(190, img.Height);
            }
            img.Save(Constants.ProductImagePath + file.FileName);
            if (img.Width > 100)
            {
                img.Resize(100, img.Height);
            }
            img.Save(Constants.ProductThumbnailPath + file.FileName);
        }
    }
}