/// <summary>
    /// 
    /// </summary>
    public class zt_classfilyBll : BaseClass
    {
        /// <summary>
        /// 
        /// </summary>
        public zt_classfilyBll() { }

        /// <summary>
        /// 从缓存中获取类的对象
        /// </summary>
        /// <param name="modelName">对象缓存Key</param>
        /// <returns></returns>
        public static zt_classfilyBll GetRuntimeClass(string modelName)
        {
            //这里从缓存中获取类的实例
            zt_classfilyBll bllclass = (zt_classfilyBll)CahceOperate.GetFromCache(modelName);
            if (bllclass == null)
            {
                bllclass = new zt_classfilyBll();
                CahceOperate.SaveToCache(modelName, bllclass);
            }
            return bllclass;
        }

        //....//类重载父类的方法.
    }

zt_classfilyBll classBll = zt_classfilyBll.GetRuntimeClass("zt_classfilyBll");
classBll.父类的方法(xx);