C# 实现简单的日志工具类

using System.IO;
public enum LogLevel
{
    Info,
    Warning,
    Error
}
public class FileLogger
{
    private readonly string _logDir;
    private readonly object _lockObj = new object();
    public FileLogger(string logDirectory = "Logs")
    {
        _logDir = logDirectory;
        if (!Directory.Exists(_logDir))
        {
            Directory.CreateDirectory(_logDir);
        }
    }
    // 写入日志
    public void Log(string message, LogLevel level = LogLevel.Info)
    {
        lock (_lockObj)
        {
            string fileName = Path.Combine(_logDir, $"Log_{DateTime.Now:yyyyMMdd}.txt");
            string logContent = $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] [{level}] {message}{Environment.NewLine}";
            File.AppendAllText(fileName, logContent, Encoding.UTF8);
        }
    }
    // 快捷方法
    public void Info(string message) => Log(message, LogLevel.Info);
    public void Warn(string message) => Log(message, LogLevel.Warning);
    public void Error(string message) => Log(message, LogLevel.Error);
    // 调用示例
    public static void TestLogger()
    {
        var logger = new FileLogger();
        logger.Info("程序启动");
        logger.Warn("配置文件未找到，使用默认配置");
        logger.Error("数据库连接失败");
    }
}