private static readonly object writeFile = new object();
        public static void WriteLog(string debugstr)
        {
            WriteLog(HttpContext.Current.Server.MapPath("~/Log"), debugstr);
        }
        private static void WriteLog(string path, string debugstr)
        {
            lock (writeFile)
            {
                try
                {
                    string filename = DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
                    //日志目录
                    if (!Directory.Exists(path))
                    {
                        Directory.CreateDirectory(path);
                    }
                    using (FileStream fs = new FileStream(path + "/" + filename, FileMode.Append,FileAccess.Write))
                    {
                        using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8))
                        {
                            sw.WriteLine(DateTime.Now.ToString() + "     " + debugstr + "\r\n");
                        }
                    }
                }
                catch (Exception eror)
                {
                    string str = eror.ToString();
                    WriteLog(path, debugstr);
                }
            }
        }