C#小型日志类

参考文章：

http://www.cnblogs.com/StupidsCat/archive/2012/08/02/2619499.html

http://www.tuicool.com/articles/RB3Qrq

class LogClass
    {
        /// <summary>
        /// 保存日志
        /// </summary>
        /// <param name="strLog">日志内容</param>
        /// <returns></returns>
        public void SaveLog(string strLog)
        {
            if (strLog == null)
            {
                return;
            }
            string strLogFilePath = Directory.GetCurrentDirectory() + "\\log.txt";
            FileInfo fileLog = new FileInfo(strLogFilePath);
            if (!fileLog.Exists)
            {
                FileStream fs;
                fs = File.Create(strLogFilePath);
                fs.Close();
                fileLog = new FileInfo(strLogFilePath);
            }

            // 文件超过指定大小则换文件保存
            if (fileLog.Length > 1024 * 1024 * 300)
            {
                string strBakFile = Directory.GetCurrentDirectory() + "\\log.txt.bak";
                File.Delete(strBakFile);
                File.Move(strLogFilePath, strBakFile);
            }
            
            using (FileStream fs = fileLog.OpenWrite())
            {
                StreamWriter streamWriter = new StreamWriter(fs);
                streamWriter.BaseStream.Seek(0, SeekOrigin.End);
                streamWriter.Write("[{0}] ", string.Format("{0:yyyy-MM-dd HH:mm:ss:ffff}", DateTime.Now));
                streamWriter.Write(strLog + "\r\n");
                streamWriter.Flush();
                streamWriter.Close();
            }
        }

        [System.Runtime.InteropServices.DllImport("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
        public static extern void OutputDebugString(string message);

        /// <summary>
        /// 调试日志输出
        /// </summary>
        /// <param name="strLog">日志内容</param>
        /// <returns></returns>
        public void DbgLog(string strLog)
        {
            #if DEBUG
            if (strLog != null)
            {
                string strTime = string.Format("{0:yyyy-MM-dd HH:mm:ss:ffff}", DateTime.Now);
                string strTmp = string.Format("[{0}] {1}", strTime, strLog);
                Console.WriteLine(strTmp);
                OutputDebugString(strTmp);
            }
            #endif
        }
    }