asp.net-mvc - 如何将基准测试记录到 MVC Controller 中的 CSV 文件？

Question

我有一个 ASP.NET Core 应用程序，其中包含继承自 BaseController 的各种 Controller 。我需要使用秒表来实现一些基本的基准测试，它只会在操作方法的开头开始并在最后结束。我可以通过 appsettings.json 打开和关闭此功能。 Startup.cs 中有一个 ILogger 工厂:

public void Configure ( IApplicationBuilder app, IHostingEnvironment env,     ILoggerFactory loggerFactory ) {
        loggerFactory.AddConsole( Configuration.GetSection( "Logging" ) );
        loggerFactory.AddDebug();
        loggerFactory.AddFile(@"C:\Logs\Portal\portal-{Date}.txt"); 

我已将 ILogger 添加到我的 BaseController (如下)，我希望这将通过 DI 提供。鉴于上述情况，我可以使用它来将基准测试结果记录到与启动文件不同的位置吗？我想要一个包含某些列的 .csv 文件，我可以用结果填充这些列。这可能吗？

public class BaseController : Controller {
    protected AppSettings AppSettings;
    protected IMapper Mapper;
    protected IPortalApiService PortalApiService;
    protected ILogger Logger;
    protected UserManager<ApplicationUser> UserManager;
    private static Stopwatch _stopWatch = new Stopwatch();
    private static long _seconds;

    public BaseController ( IMapper mapper,
                            IOptions<AppSettings> appSettings,
                            UserManager<ApplicationUser> userManager,
                            IPortalApiService PortalApiService,
                            ILogger logger) {
        Mapper = mapper;
        AppSettings = appSettings.Value;
        UserManager = userManager;
        PortalApiService = PortalApiService;
        Logger = logger;
    }

    public BaseController ( IMapper mapper,
                            IOptions<AppSettings> appSettings,
                            UserManager<ApplicationUser> userManager,
                            ILogger logger) {
        Mapper = mapper;
        AppSettings = appSettings.Value;
        UserManager = userManager;
        Logger = logger;
    }

    protected Task<ApplicationUser> GetCurrentUserAsync () {
        return UserManager.GetUserAsync( HttpContext.User );
    }

    public void StartBenchmark()
    {

        if (AppSettings.EnableBenchmarkLogging)
        {
            _stopWatch = Stopwatch.StartNew();
        }

    }

    public void EndBenchmark()
    {
        if (_stopWatch.IsRunning)
        {
            _stopWatch.Stop();
            _seconds = _stopWatch.ElapsedMilliseconds;
            //logging to do
        }
    }
}

Answer 1

是not a good idea to use a BaseController in MVC 。有更好的方法来实现 crosscutting concerns 。在这种特殊情况下，您可以使用 global filter .

public class BenchmarkFilter : IActionFilter
{
    private readonly ILogger Logger;

    // DON'T DECLARE STATIC!! 
    private Stopwatch _stopWatch = new Stopwatch();

    public BenchmarkFilter(ILogger logger)
    {
        _logger = logger ?? 
            throw new ArgumentNullException(nameof(logger));
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        _stopWatch = Stopwatch.StartNew();
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        if (_stopWatch.IsRunning)
        {
            _stopWatch.Stop();
            var seconds = _stopWatch.ElapsedMilliseconds;
            //logging to do
        }
    }
}

这允许您通过构造函数通过 DI 注入(inject)服务，无需将这些参数添加到子类公共(public) BaseController 的每个 Controller ，从而将基准测试的关注点与完全 Controller 。

用法

在 Startup.cs 中，在 ConfigureServices 方法中添加过滤器。

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc(options =>
    {
        options.Filters.Add(typeof(BenchmarkFilter)); // runs on every action method call
    });

    services.AddScoped<BenchmarkFilter>();
    // ....
}