c# - 如何在单独的线程上运行后台服务？

Question

我意识到后台服务会阻塞主线程，突然间它会在我的主线程中产生延迟。我找不到有关如何使后台服务不产生延迟和阻塞主线程的有用资源。有什么建议吗？

public Task StartAsync(CancellationToken cancellationToken)
{
    _timer = new Timer(DoWork, null, 0, 10000);
    Initialize().GetAwaiter();

    return Task.CompletedTask;
}

private async void DoWork(object state)
{
    try
    {
        //some logic
        await testService.DoWorkAsync();
    }
    catch (Exception ex)
    {
        Log.Error(ex, "TestBackgroundService DoWork throws ");
    }
}


private async Task Initialize()
{
    while (true)
    {
        try
        {
            if (IsEnabled)
            {
                //some logic
                await testService.PrintAsync();
                IsEnabled = false;
            }
            else
            {
                //some logic
                await testService.CloseAsync();
                if (condition)
                {
                    IsEnabled = true;
                }
            }
            await Task.Delay(1000);
        }
        catch (Exception ex)
        {
            Log.Error($"ExecuteAsync throws {ex.ToString()}");
        }
    }
}

Answer 1

你必须以正确的方式使用它，我认为范围内的后台任务是你想要的:

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?view=aspnetcore-3.1&tabs=visual-studio#consuming-a-scoped-service-in-a-background-task

这里有一个 ExecuteAsync 方法，您可以像这样使用它:

protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
    
    while (!stoppingToken.IsCancellationRequested)
    {
        //your code

        await DoWork(stoppingToken);
        Task.Delay(1000);
    }
}