如何在计时器回调中或在触发任务的方法中获得正确的IMemoryCache实例？

services.AddMemoryCache();

public class MyService
{
    private readonly IMemoryCache _memoryCache;

    public MyService(IMemoryCache memoryCache)
    {
        _memoryCache = memoryCache;
    }

    public void MyMethod()
    {
        // 在这里可以使用_memoryCache实例进行缓存操作
    }
}

public class MyBackgroundService : BackgroundService
{
    private readonly IServiceProvider _serviceProvider;

    public MyBackgroundService(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            using (var scope = _serviceProvider.CreateScope())
            {
                var memoryCache = scope.ServiceProvider.GetRequiredService<IMemoryCache>();

                // 在这里可以使用memoryCache实例进行缓存操作

                await Task.Delay(TimeSpan.FromSeconds(1), stoppingToken);
            }
        }
    }
}