如何使用核心依赖注入按环境指定NLog的配置？

// Startup.cs

public class Startup
{
    private IConfiguration Configuration { get; }

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        // 注册NLog服务
        services.AddSingleton<ILoggerManager, NLogManager>();

        // 获取当前环境
        var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

        // 根据当前环境指定配置文件
        var configFileName = $"appsettings.{environment}.json";

        // 读取配置文件
        var config = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(configFileName, optional: true, reloadOnChange: true)
            .Build();

        // 注册配置文件
        services.AddSingleton<IConfiguration>(config);
    }
}

// NLogManager.cs

public class NLogManager : ILoggerManager
{
    private readonly IConfiguration _config;

    public NLogManager(IConfiguration config)
    {
        _config = config;
        // 根据配置文件初始化NLog
        LogManager.Configuration = new NLogLoggingConfiguration(_config.GetSection("NLog"));
    }

    public void LogInfo(string message)
    {
        var logger = LogManager.GetCurrentClassLogger();
        logger.Info(message);
    }

    // 其他日志级别的方法...
}

// HomeController.cs

public class HomeController : Controller
{
    private readonly ILoggerManager _logger;

    public HomeController(ILoggerManager logger)
    {
        _logger = logger;
    }

    public IActionResult Index()
    {
        _logger.LogInfo("Hello, world!");
        return View();
    }
}