C#异常信息保存

保存异常信息，文件不存在自动创建，文件夹不存在自动创建

        /// <summary>
        /// 保存异常信息
        /// </summary>
        /// <param name="error">异常信息</param>
        public static void Preservation(string error)
        {
            DateTime date = DateTime.Now;
            string url = Environment.CurrentDirectory + "/Error/" + date.Month + "/";
            Directory.CreateDirectory(url);
            File.AppendAllText(url + date.Day + ".txt", error + "【" + DateTime.Now.ToLongTimeString() + "】\r\n", Encoding.UTF8);
        }

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