如何在asp.net核心中使持久化后台任务成为作用域服务？

public class MyBackgroundTask : IHostedService
{
    private readonly ILogger<MyBackgroundTask> _logger;
    private readonly IServiceScopeFactory _serviceScopeFactory;

    public MyBackgroundTask(ILogger<MyBackgroundTask> logger, IServiceScopeFactory serviceScopeFactory)
    {
        _logger = logger;
        _serviceScopeFactory = serviceScopeFactory;
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("后台任务已启动");

        Task.Run(async () =>
        {
            while (!cancellationToken.IsCancellationRequested)
            {
                using (var scope = _serviceScopeFactory.CreateScope())
                {
                    var dbContext = scope.ServiceProvider.GetRequiredService<MyDbContext>();
                    // 执行持久化后台任务的逻辑
                    await dbContext.SaveChangesAsync();
                }

                await Task.Delay(TimeSpan.FromMinutes(10), cancellationToken);
            }
        }, cancellationToken);

        return Task.CompletedTask;
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("后台任务已停止");
        return Task.CompletedTask;
    }
}

public void ConfigureServices(IServiceCollection services)
{
    // 注册后台任务
    services.AddHostedService<MyBackgroundTask>();

    // 其他服务的注册
    // ...
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // 其他中间件的配置
    // ...

    // 启用后台任务
    app.ApplicationServices.GetRequiredService<IHostedService>().StartAsync(CancellationToken.None);
}