定义错误类

　　
　　//错误类
 　　public class Error
    {
        /// <summary>
        /// 错误代码
        /// </summary>
        public string errcode { get; set; }
        /// <summary>
        /// 错误描述
        /// </summary>
        public string errmsg { get; set; }
        /// <summary>
        /// 添加错误信息
        /// </summary>
        /// <param name="errcode">错误代码</param>
        /// <param name="errmsg">错误描述</param>
        /// <returns>Error实体</returns>
        public static Error AddE(string errcode, string errmsg)
        {
            Error er = new Error();
            er.errcode = errcode;
            er.errmsg = errmsg;
            return er;
        }
    }