/// <summary>        /// 生成分类下拉-列表框,选中指定的项        /// </summary>        /// <param name="html"></param>        /// <param name="selectedValue"></param>        /// <returns></returns>        public static MvcHtmlString SelectList_Category(this HtmlHelper html, long selectedValue)        {            Data.IRepository _iRepository = new Data.DataRepository();            StringBuilder sb = new StringBuilder();            sb.Append("<select name=‘Category‘ id=‘Category‘>");            foreach (var i in _iRepository.GetModel<Category>())            {                if (i.ID == selectedValue && selectedValue != 0)                    sb.AppendFormat("<option value=http://www.mamicode.com/‘{0}‘ selected=‘selected‘>{1}", i.ID, i.Name);                else                    sb.AppendFormat("<option value=http://www.mamicode.com/‘{0}‘>{1}", i.ID, i.Name);            }            sb.Append("</select>");            return MvcHtmlString.Create(sb.ToString());        }        /// <summary>        /// 生成分类下拉列表框        /// </summary>        /// <param name="html"></param>        /// <returns></returns>        public static MvcHtmlString SelectList_Category(this HtmlHelper html)        {            return SelectList_Category(html, 0);        }