public static string[] GetContainedImageFileNames(
     string html)
 {
     if (String.IsNullOrEmpty(html) || !html.Contains(HtmlImageHelper.ImagesFolderPathPlaceHolder))
     {
         return(new string[] { });
     }
     else
     {
         using (var ch = new HtmlConversionHelper())
         {
             return(ch.GetContainedImageFileNames(html, HtmlImageHelper.ImagesFolderPathPlaceHolder));
         }
     }
 }
 public static string[] GetContainedImageFileNames(
     string html)
 {
     if (String.IsNullOrEmpty(html) || !html.Contains(HtmlImageHelper.ImagesFolderPathPlaceHolder))
     {
         return new string[] { };
     }
     else
     {
         using (var ch = new HtmlConversionHelper())
         {
             return ch.GetContainedImageFileNames(html, HtmlImageHelper.ImagesFolderPathPlaceHolder);
         }
     }
 }