C#多线程日志的实现

1、定义输出目标类型

public enum LogTarget
    {
        File,
        Console
    }

2、定义日志基类

public abstract class LogBase
    {
        public static string logPath;
        protected readonly object lockObject = new object();
        public abstract void Log(string message);
    }

3、输出日志文件

public class FileLogger : LogBase
    {
        static string fileName;
        //private string filePath = Path.Combine(logPath, "log" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt");
        static FileLogger()
        {
            if (logPath==null || logPath.Equals(""))
            {
                logPath = AppDomain.CurrentDomain.BaseDirectory;
                logPath = Path.Combine(logPath, "log");
                if (!Directory.Exists(logPath))
                {
                    Directory.CreateDirectory(logPath);
                }
            }
            
            fileName = DateTime.Now.ToString("yyyyMMdd") + ".log";
            fileName = Path.Combine(logPath, fileName);
        }
        public override void Log(string message)
        {
            message=message+Environment.NewLine;
            using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite, 128, FileOptions.Asynchronous))
            {
                lock (lockObject)
                {
                    byte[] buffer = Encoding.Default.GetBytes(message);
                    long position = fs.Length;
                    if (position > 33_554_432L)
                    {
                        HandleLogFile(fs, ref position);
                    }
                    fs.Seek(position, SeekOrigin.Begin);
                    fs.Write(buffer, 0, buffer.Length);
                    fs.Close();
                }
            }
        }
        /// <summary>
        /// 日志文件超过32M则从临时文件拷贝出去
        /// </summary>
        /// <param name="fs"></param>
        /// <param name="position"></param>
        private static void HandleLogFile(FileStream fs, ref long position)
        {
            string target = Path.Combine(logPath, DateTime.Now.ToString("yyyy-MM-dd HH:mm:dd:fff") + ".log");
            if (!File.Exists(target))
            {
                File.Copy(fileName, target);
                fs.Seek(0, SeekOrigin.Begin);
                fs.SetLength(0);
                position = 0;
            }
        }
    }

4、输出到控制台

public class ConsoleLogger : LogBase
    {
        public override void Log(string message)
        {
            lock (lockObject)
            {
                Console.WriteLine(message);
            }
        }
    }

5、日志管理

public static void Information(LogTarget target, string outTemplate)
        {
            //string outTemplate = $"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} [Info] {message}";
            switch (target)
            {
                case LogTarget.File:
                    logBase = new FileLogger();
                    logBase.Log(outTemplate);
                    break;
                case LogTarget.Console:
                    logBase = new ConsoleLogger();
                    logBase.Log(outTemplate);
                    break;
                default:
                    break;

            }
        }

6、日志应用函数

 private static LogBase logBase = null;
    public static void SetLogPath([CallerMemberName]string path="")
    {
        LogBase.logPath = path;
    }
    public static void Info(string message)
    {
        string outTemplate = $"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} [Info] {message}";
        Information(LogTarget.File, outTemplate);
    }

    public static void Debug(string message)
    {
        string outTemplate = $"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} [Debug] {message}";
        Information(LogTarget.File, outTemplate);
    }

    public static void Warn(string message)
    {
        string outTemplate = $"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} Warn] {message}";
        Information(LogTarget.File, outTemplate);
    }

    public static void Error(string message)
    {
        string outTemplate = $"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} Error] {message}";
        Information(LogTarget.File, outTemplate);
    }

7、日志使用

Logger.Info($"{name}(Pxie4135) is Compliance");