{"id":28965,"date":"2019-03-12T01:03:00","date_gmt":"2019-03-12T00:03:00","guid":{"rendered":"https:\/\/blexin.com\/loggare-o-non-loggare-nessun-problema\/"},"modified":"2021-05-20T19:22:23","modified_gmt":"2021-05-20T17:22:23","slug":"to-log-in-or-not-to-log-in-no-problem","status":"publish","type":"post","link":"https:\/\/blexin.com\/en\/blog-en\/to-log-in-or-not-to-log-in-no-problem\/","title":{"rendered":"To log-in or not to log-in? No problem!"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Among the many innovations introduced in ASP.NET Core, one of the most important is the existence of an incorporated \u201cDependency injection\u201d motor.<\/p>\n\n\n\n

The Visual Studio for a project ASP.NET Core MVC includes the configuration needed to use it, whereas we don\u2019t have any kind of help, when we create a console application .NET Core.<\/p>\n\n\n\n

We investigate now how to solve this problem. As first step, we create two interfaces in our project.<\/p>\n\n\n\n

In this demo I used the .NET Core version 2.2.<\/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
We create then two classes, that will implement these interfaces.<\/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
In the class constructor of the ClassB, the interface interfaceA has been injected.<\/p>\n\n\n\n
Now we have to install the following packet through NuGet: Microsoft.Extensions.DependencyInjection<\/strong><\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
We need now a method that add and possibly configure our services.<\/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
We choose the AddSingleton() method, which use always the same ClassA and ClassB Instance for every request.<\/p>\n\n\n\n
It is also possible to operate different choices: AddScoped() or AddTransient() for example, depending on the context where you are writing the code. The complete documentation is available at following address<\/a><\/p>\n\n\n\n
The ConfigureServices() method is invoked in the Main() method of our console application, in order to create a ServiceCollection, that we will use in the application.<\/p>\n\n\n\n
We need to develop a ServiceProvider, that is to say the object able to recover the instances of our services:<\/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
At this stage, we just need to use instances of our services:<\/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
A more concrete example of this technique is that of Logging in .NET Core, an API that is compatible with a lot of third-party logging provider.<\/p>\n\n\n\n
We need to install two more NuGet packets:Microsoft.Extensions.Logging<\/strong> and Microsoft.Extensions.Logging.Console<\/strong><\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
We modify the ConfigureService method to register a Logging service through 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
We modify the ClassB by injecting the Logging service through the constructor.<\/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
We modify then the method Main() to display the logging effect in the terminal:<\/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
As last example, we use Serilog, a very common logging library, which is compatible both with .NET and .NET Core. Packets to install are:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
We modify now the method ConfigureServices, in order to regiter Serilog. We initially choose to run the log only on 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
The output has been modified (and remember that you can configure it further).<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
We can display log messages in the console and in the same time save them on file. The modification of CongifureServices () is very simple.<\/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
There are many other packets, that manage the Serilog logging. These packets are defined as Sink<\/strong>. You can find the complete list of sink<\/strong> available for Serilog at this address<\/a> .<\/p>\n\n\n\n
The code used in this article is available on GitHub at following link<\/a><\/p>\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
How to use the dependency injection in a .Net Core console application to manage logging with Serilog<\/p>\n","protected":false},"author":196716245,"featured_media":28943,"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":"","_crdt_document":"","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,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","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":[688637524],"tags":[688637416],"class_list":["post-28965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en","tag-asp-net-core-en"],"yoast_head":"\nTo log-in or not to log-in? 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