using System; using System.Configuration; using System.IO; using System.Threading; namespace FQDService.Utils {     /// <summary>     /// 写日志类     /// </summary>     public class FileLogger     {         #region 字段         public static readonly object _lock = new object();         #endregion         #region 写文件         /// <summary>         /// 写文件         /// </summary>         public static void WriteFile(string log, string path)         {             Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)             {                 lock (_lock)                 {                     if (!File.Exists(path))                     {                         using (FileStream fs = new FileStream(path, FileMode.Create)) { }                     }                     using (FileStream fs = new FileStream(path, FileMode.Append, FileAccess.Write))                     {                         using (StreamWriter sw = new StreamWriter(fs))                         {                             #region 日志内容                             string value = string.Format(@"{0} -------------------------------------------------------- {1} ", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), obj.ToString());                             #endregion                             sw.WriteLine(value);                             sw.Flush();                         }                     }                 }             }));             thread.Start(log);         }         #endregion         #region 写日志         /// <summary>         /// 写日志         /// </summary>         public static void WriteLog(string log)         {             string logPath = ConfigurationManager.AppSettings["LogPath"] + "\\FQDService_Log.txt";             WriteFile(log, logPath);         }         #endregion         #region 写错误日志         /// <summary>         /// 写错误日志         /// </summary>         public static void WriteErrorLog(string log)         {             string logPath = ConfigurationManager.AppSettings["LogPath"] + "\\FQDService_ErrorLog.txt";             WriteFile(log, logPath);         }         #endregion     } }