用于将错误信息输出到txt文件

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 /// <summary>    /// 用于将错误信息输出到txt文件    /// </summary>    /// <param name="errorMessage">错误详细信息</param>    public static void WriteError(string errorMessage)    {        try        {            string path = "~/Error/" + DateTime.Today.ToString("yyMMdd") + ".txt";            if (!File.Exists(System.Web.HttpContext.Current.Server.MapPath(path)))            {                File.Create(System.Web.HttpContext.Current.Server.MapPath(path)).Close();            }            using (StreamWriter w = File.AppendText(System.Web.HttpContext.Current.Server.MapPath(path)))            {                w.WriteLine("\r\nLog Entry : ");                w.WriteLine("{0}", DateTime.Now.ToString(CultureInfo.InvariantCulture));                w.WriteLine(errorMessage);                w.WriteLine("________________________________________________________");                w.Flush();                w.Close();            }        }        catch (Exception ex)        {            WriteError(ex.Message);        }    }

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