EF 不同参数动态排序

 /// <summary>
        /// 根据不同参数动态排序
        /// </summary>
        /// <param name="condition">Lambda表达式</param>
        /// <param name="pageIndex">当前页</param>
        /// <param name="pageSize">一页条数</param>
        /// <param name="total">总条数</param>
        /// <param name="propertyName">需要排序的字段名</param>
        /// <param name="IsDESC">是否降序</param>
        /// <returns></returns>
        public static List<CusClass> GetEntity(Expression<Func<Customers_tb, bool>> condition, int pageIndex, int pageSize, out int total,out string message, string propertyName, bool IsDESC)
        {
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