{"id":28940,"date":"2019-03-12T01:03:00","date_gmt":"2019-03-12T00:03:00","guid":{"rendered":"https:\/\/blexin.com\/?p=28940"},"modified":"2021-01-13T09:40:43","modified_gmt":"2021-01-13T08:40:43","slug":"loggare-o-non-loggare-nessun-problema","status":"publish","type":"post","link":"https:\/\/blexin.com\/it\/blog\/loggare-o-non-loggare-nessun-problema\/","title":{"rendered":"Loggare o non loggare? Nessun problema!"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Tra le numerose novit\u00e0 introdotte in ASP.NET Core, una delle pi\u00f9 importanti \u00e9 la presenza di un motore di “Dependency Injection” incorporato.<\/p>\n\n\n\n

Mentre il template di Visual Studio per un progetto ASP.NET Core MVC include gi\u00e0 la configurazione necessaria per utilizzarla, quando creiamo una console application .NET Core non abbiamo nessun aiuto.<\/p>\n\n\n\n

Vediamo quindi come possiamo risolvere questo problema. Anzitutto creiamo nel nostro progetto due interfacce.<\/p>\n\n\n\n

In questa demo ho utilizzato la versione 2.2 di .NET Core.<\/p>\n\n\n

\nnamespace DemoArticolo.Interfaces\n{\n\u00a0\n\u00a0\u00a0\u00a0\u00a0public interface InterfaceA\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0void DoSomething();\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0public interface InterfaceB\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0void DoSomethingElse();\n\u00a0\u00a0\u00a0\u00a0}\n}\n<\/pre><\/div>\n\n\n
Creiamo quindi due classi che implementino queste interfacce.<\/p>\n\n\n
\npublic class ClassA : InterfaceA\n{\n\u00a0\u00a0\u00a0\u00a0public void DoSomething()\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Console.WriteLine("Writing something to the console from ClassA");\n\u00a0\u00a0\u00a0\u00a0} \n}\n<\/pre><\/div>\n\n\n
Nel costruttore della classe ClassB \u00e8 stata iniettata l’interfaccia interfaceA.<\/p>\n\n\n\n
Occorre a questo punto installare tramite NuGet il seguente pacchetto:\u00a0Microsoft.Extensions.DependencyInjection<\/strong><\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Abbiamo quindi bisogno di un metodo che aggiunga\u00a0ed\u00a0eventualmente configuri\u00a0i nostri servizi.<\/p>\n\n\n
\nprivate static void ConfigureServices(ServiceCollection serviceCollection)\n{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceA, ClassA>();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceB, ClassB>();\n}\n<\/pre><\/div>\n\n\n
Abbiamo scelto il metodo AddSingleton() che utilizzer\u00e0 sempre la stessa istanza di ClassA e ClassB per ogni richiesta.<\/p>\n\n\n\n
\u00c8 possibile, comunque, fare scelte diverse, quali ad esempio AddScoped() o AddTransient() in base al contesto in cui state inserendo il codice. La documentazione completa \u00e8 disponibile al seguente indirizzo<\/a><\/p>\n\n\n\n
Il metodo ConfigureServices() \u00e8 invocato nel metodo Main() della nostra console application, per creare la ServiceCollection che utilizzeremo nel corso dell’applicazione.<\/p>\n\n\n\n
Va quindi costruito un ServiceProvider, ossia l’oggetto che \u00e8 in grado di recuperare le istanze dei nostri servizi.<\/p>\n\n\n
\nstatic void Main(string[] args)\n{\n\u00a0\u00a0\u00a0\u00a0var serviceCollection = new ServiceCollection();\n\u00a0\u00a0\u00a0\u00a0ConfigureServices(serviceCollection);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0var serviceProvider = serviceCollection.BuildServiceProvider();\n}\n<\/pre><\/div>\n\n\n
A questo punto, dobbiamo solo utilizzare le istanze dei nostri servizi:<\/p>\n\n\n
\nstatic void Main(string[] args)\n{\n\u00a0\u00a0\u00a0\u00a0var serviceCollection = new ServiceCollection();\n\u00a0\u00a0\u00a0\u00a0ConfigureServices(serviceCollection);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0var serviceProvider = serviceCollection.BuildServiceProvider();\n\u00a0\u00a0\u00a0\u00a0var implementazione = serviceProvider.GetService<InterfaceB>();\n\u00a0\u00a0\u00a0\u00a0implementazione.DoSomethingElse();\n}\n<\/pre><\/div>\n\n\n
\"\"<\/figure>\n\n\n\n
Un esempio pi\u00f9 concreto di questa tecnica \u00e8 quello del Logging in .NET Core, una API che \u00e8 compatibile con un gran numero di provider di logging di terze parti.<\/p>\n\n\n\n
\u00c8 necessario installare due altri pacchetti da NuGet:\u00a0Microsoft.Extensions.Logging<\/strong>\u00a0e\u00a0Microsoft.Extensions.Logging.Console<\/strong><\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Modifichiamo il metodo ConfigureService, per registrare il servizio di Logging tramite console.<\/p>\n\n\n
\nprivate static void ConfigureServices(ServiceCollection serviceCollection)\n{\n\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceA, ClassA>();\n\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceB, ClassB>();\n\u00a0\u00a0\u00a0serviceCollection.AddLogging(configure => configure.AddConsole());\n}\n<\/pre><\/div>\n\n\n
Modifichiamo la ClassB iniettando, tramite il costruttore, il servizio di Logging.<\/p>\n\n\n
\npublic class ClassB : InterfaceB\n{\n\u00a0\u00a0\u00a0\u00a0private readonly InterfaceA interfaceA;\n\u00a0\u00a0\u00a0\u00a0private readonly ILogger<Program> logger;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0public ClassB(InterfaceA _interfaceA, ILogger<Program> _logger)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0interfaceA = _interfaceA;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0logger = _logger;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0public void DoSomethingElse()\n\u00a0\u00a0\u00a0\u00a0{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0interfaceA.DoSomething();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0logger.LogInformation("Logging from InterfaceB");\n\u00a0\u00a0\u00a0\u00a0}\n}\n<\/pre><\/div>\n\n\n
Modifichiamo, infine, il method Main() per visualizzare l’effetto del logging nel terminale.<\/p>\n\n\n
\nstatic void Main(string[] args)\n{\n\u00a0\u00a0\u00a0\u00a0var serviceCollection = new ServiceCollection();\n\u00a0\u00a0\u00a0\u00a0ConfigureServices(serviceCollection);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0var serviceProvider = serviceCollection.BuildServiceProvider();\n\u00a0\n\u00a0\u00a0\u00a0\u00a0var logger = serviceProvider.GetService<ILogger<Program>>();\n\u00a0\u00a0\u00a0\u00a0logger.LogWarning("Hello, Dependency");\n\u00a0\n\u00a0\u00a0\u00a0\u00a0var implementazione = serviceProvider.GetService<InterfaceB>();\n\u00a0\u00a0\u00a0\u00a0implementazione.DoSomethingElse();\n\u00a0\n\u00a0\u00a0\u00a0\u00a0Console.ReadLine();\n}\n<\/pre><\/div>\n\n\n
\"\"<\/figure>\n\n\n\n
Come ultimo esempio, utilizziamo Serilog, una libreria di logging molto diffusa che \u00e8 compatibile sia con .NET, che con .NET Core. I pacchetti da installare sono i seguenti:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Modifichiamo il metodo ConfigureServices, in maniera tale da registrare Serilog. Scegliamo inizialmente di eseguire il log solo su console.<\/p>\n\n\n
\nprivate static void ConfigureServices(ServiceCollection serviceCollection)\n{\n\u00a0\u00a0\u00a0\u00a0Log.Logger = new LoggerConfiguration()\n\u00a0\u00a0\u00a0\u00a0\u00a0.Enrich.FromLogContext()\n\u00a0\u00a0\u00a0\u00a0\u00a0.WriteTo.Console()\n\u00a0\u00a0\u00a0\u00a0\u00a0.CreateLogger();\n\u00a0\n\u00a0\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceA, ClassA>();\n\u00a0\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceB, ClassB>();\n\u00a0\u00a0\u00a0\u00a0\/\/ serviceCollection.AddLogging(configure => configure.AddConsole());\n\u00a0\n\u00a0\u00a0\u00a0\u00a0serviceCollection.AddLogging(configure => configure.AddSerilog());\n}\n<\/pre><\/div>\n\n\n
L’output viene modificato (e ricordiamo che pu\u00f2 essere ulteriormente configurato).<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Possiamo visualizzare i messaggi di log in console e contemporaneamente salvarli su file. La modifica di ConfigureServices() \u00e8 molto semplice.<\/p>\n\n\n
\nprivate static void ConfigureServices(ServiceCollection serviceCollection)\n{\n\u00a0\u00a0\u00a0\u00a0Log.Logger = new LoggerConfiguration()\n\u00a0\u00a0\u00a0\u00a0\u00a0.Enrich.FromLogContext()\n\u00a0\u00a0\u00a0\u00a0\u00a0.WriteTo.Console()\n\u00a0\u00a0\u00a0\u00a0\u00a0.WriteTo.File("log.txt", rollingInterval: RollingInterval.Day)\n\u00a0\u00a0\u00a0\u00a0\u00a0.CreateLogger();\n\u00a0\n\u00a0\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceA, ClassA>();\n\u00a0\u00a0\u00a0\u00a0serviceCollection.AddSingleton<InterfaceB, ClassB>();\n\u00a0\u00a0\u00a0\u00a0\/\/ serviceCollection.AddLogging(configure => configure.AddConsole());\n\u00a0\n\u00a0\u00a0\u00a0\u00a0serviceCollection.AddLogging(configure => configure.AddSerilog());\n}\n<\/pre><\/div>\n\n\n
\"\"<\/figure>\n\n\n\n
Esistono numerosi altri pacchetti che gestiscono il logging di Serilog. Tali pacchetti vengono definiti Sink<\/strong>. A questo indirizzo<\/a> troverete l’elenco completo di sink<\/strong> disponibili per Serilog.<\/p>\n\n\n\n
Il codice citato in questo articolo \u00e8 disponibile su GitHub al seguente\u00a0link<\/a><\/p>\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Come usare la dependency injection in una console application .Net Core per la gestione del logging con Serilog<\/p>\n","protected":false},"author":196716245,"featured_media":28942,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","inline_featured_image":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[688637374],"tags":[688637414],"class_list":["post-28940","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-asp-net-core"],"yoast_head":"\nLoggare o non loggare? 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