如何在asp.net web窗体和.Net核心Web项目上无休止地运行任务？

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Timer timer = new Timer(new TimerCallback(DoWork), null, TimeSpan.Zero, TimeSpan.FromMinutes(5));
    }

    private void DoWork(object state)
    {
        // 执行后台任务
    }
}

public class BackgroundService : IHostedService, IDisposable
{
    private Timer _timer;

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _timer = new Timer(DoWork, null, TimeSpan.Zero, TimeSpan.FromMinutes(5));
        return Task.CompletedTask;
    }

    private void DoWork(object state)
    {
        // 执行后台任务
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        _timer?.Change(Timeout.Infinite, 0);
        return Task.CompletedTask;
    }

    public void Dispose()
    {
        _timer?.Dispose();
    }
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddHostedService<BackgroundService>();
    // 其他服务配置
}