/// <summary>
        /// 得到图片文件,缩略图,根据参数(width:100,height:75)返回如:
        /// http://...../upload/editorial/day_111013/thumb/201110130326326847_100_75.jpg
        /// </summary>
        /// <param name="helper"></param>
        /// <param name="path"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public static string ImageFile(this UrlHelper helper, string path, int width, int height, bool containStaticServiceUri = true)
        {
            if (string.IsNullOrEmpty(path))
            {
                return(helper.StaticFile(@"/content/images/no_picture.jpg"));
            }

            if (width <= 0 || height <= 0)
            {
                return(helper.StaticFile(path));
            }

            var thumbnailUrl = ThumbnailHelper.GetThumbnailUrl(path, width, height);
            var url          = (containStaticServiceUri ? GetStaticServiceUri() : string.Empty) + thumbnailUrl;

            return(url);
        }