server-side responsive images

1 ImageController.cs

public FilePathResult Image(int id, int x, int y)
{
    var image = db.Images.First(i => i.ID == id);
    var newPath = image.GetFile(imagePath, new Size(x, y));
    return File(newPath, "image/jpeg");
}

2 Image.cs

public string GetFile(string imageDirectory, Size size)
  => ImageRetriever.GetImage(imageDirectory, Name, size)
  ?? ImageCreator.CreateImage(imageDirectory, Name, size);