Bloom.Book.HtmlDom.SetImageElementUrl C# (CSharp) Method

        public static void SetImageElementUrl(ElementProxy imgOrDivWithBackgroundImage, UrlPathString url)
        {
            if(imgOrDivWithBackgroundImage.Name.ToLower() == "img")
            {
                imgOrDivWithBackgroundImage.SetAttribute("src", url.UrlEncoded);
            }
            else
            {
                imgOrDivWithBackgroundImage.SetAttribute("style", string.Format("background-image:url('{0}')", url.UrlEncoded));
            }
        }

 /// <summary>
 /// Find every place in the html file where an img element is nested inside a div with class bloom-imageContainer.
 /// Convert the img into a background image of the image container div.
 /// Specifically, make the following changes:
 /// - Copy any data-x attributes from the img element to the div
 /// - Convert the src attribute of the img to style="background-image:url('...')" (with the same source) on the div
 ///    (any pre-existing style attribute on the div is lost)
 /// - Add the class bloom-backgroundImage to the div
 /// - delete the img element
 /// (See oldImg and newImg in unit test CompressBookForDevice_ImgInImgContainer_ConvertedToBackground for an example).
 /// </summary>
 /// <param name="wholeBookHtml"></param>
 /// <returns></returns>
 private static void ConvertImagesToBackground(XmlDocument dom)
 {
     foreach (var imgContainer in dom.SafeSelectNodes("//div[contains(@class, 'bloom-imageContainer')]").Cast <XmlElement>().ToArray())
     {
         var img = imgContainer.ChildNodes.Cast <XmlNode>().FirstOrDefault(n => n is XmlElement && n.Name == "img");
         if (img == null || img.Attributes["src"] == null)
         {
             continue;
         }
         // The filename should be already urlencoded since src is a url.
         var src = img.Attributes["src"].Value;
         HtmlDom.SetImageElementUrl(new ElementProxy(imgContainer), UrlPathString.CreateFromUrlEncodedString(src));
         foreach (XmlAttribute attr in img.Attributes)
         {
             if (attr.Name.StartsWith("data-"))
             {
                 imgContainer.SetAttribute(attr.Name, attr.Value);
             }
         }
         imgContainer.SetAttribute("class", imgContainer.Attributes["class"].Value + " bloom-backgroundImage");
         imgContainer.RemoveChild(img);
     }
 }