使用TimerCallback时在静态类中使用“全局”变量的替代方法

public class TimerManager
{
    private static TimerManager _instance;
    private Timer _timer;

    private TimerManager()
    {
        // 初始化定时器
        _timer = new Timer(OnTimerCallback, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
    }

    public static TimerManager Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new TimerManager();
            }
            return _threadSafeInstance;
        }
    }

    private void OnTimerCallback(object state)
    {
        // 处理定时任务
    }
}

public class TimerService
{
    private Timer _timer;

    public TimerService()
    {
        _timer = new Timer(OnTimerCallback, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
    }

    private void OnTimerCallback(object state)
    {
        // 处理定时任务
    }
}

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<TimerService>();
    }
}

public static class TimerHelper
{
    private static Timer _timer;
    private static int _counter;

    public static void StartTimer()
    {
        _timer = new Timer(OnTimerCallback, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
    }

    private static void OnTimerCallback(object state)
    {
        _counter++;
        Console.WriteLine($"Counter: {_counter}");
    }
}

public static class TimerHelper
{
    private static Timer _timer;
    private static int _counter;
    private static readonly object _lock = new object();

    public static void StartTimer()
    {
        _timer = new Timer(OnTimerCallback, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
    }

    private static void OnTimerCallback(object state)
    {
        lock (_lock)
        {
            _counter++;
            Console.WriteLine($"Counter: {_counter}");
        }
    }
}