{"id":1738,"date":"2023-06-14T08:28:46","date_gmt":"2023-06-14T08:28:46","guid":{"rendered":"http:\/\/waqar-arshad.com\/?p=1738"},"modified":"2023-06-14T08:28:46","modified_gmt":"2023-06-14T08:28:46","slug":"asp-net-built-in-ioc-container","status":"publish","type":"post","link":"http:\/\/waqar-arshad.com\/index.php\/2023\/06\/14\/asp-net-built-in-ioc-container\/","title":{"rendered":"Asp.Net Built In IoC Container"},"content":{"rendered":"
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ASP.NET Core: Built-in IoC Container<\/h1>\n\n\n\n

ASP.NET Core framework includes built-in IoC container for automatic dependency injection. The built-in IoC container is a simple yet effective container. Let’s understand how the built-in IoC container works internally.<\/p>\n\n\n\n

The followings are important interfaces and classes for built-in IoC container:<\/p>\n\n\n\n

Interfaces:<\/strong><\/p>\n\n\n\n

    \n
  1. IServiceProvider<\/li>\n\n\n\n
  2. IServiceCollection<\/li>\n<\/ol>\n\n\n\n

    Classes:<\/strong><\/p>\n\n\n\n

      \n
    1. ServiceProvider<\/li>\n\n\n\n
    2. ServiceCollection<\/li>\n\n\n\n
    3. ServiceDescription<\/li>\n\n\n\n
    4. ServiceCollectionServiceExtensions<\/li>\n\n\n\n
    5. ServiceCollectionContainerBuilderExtensions<\/li>\n<\/ol>\n\n\n\n

      The following diagram illustrates the relationship between these classes:<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      <\/a>built-in IoC Container<\/p>\n\n\n\n

      IServiceCollection<\/h2>\n\n\n\n

      As you know, we can register application services with built-in IoC container in the Configure method of Startup class by using IServiceCollection. IServiceCollection interface is an empty interface. It just inherits IList<servicedescriptor><\/code>. See the source code here<\/a>.<\/p>\n\n\n\n

      The ServiceCollection class implements IServiceCollection interface. See the ServiceCollection source code here<\/a>.<\/p>\n\n\n\n

      So, the services you add in the IServiceCollection<\/code> type instance, it actually creates an instance of ServiceDescriptor<\/a> and adds it to the list.<\/p>\n\n\n\n

      IServiceProvider<\/h2>\n\n\n\n

      IServiceProvider<\/code> includes GetService<\/code> method. The ServiceProvider<\/code> class implements IServiceProvider<\/code> interface which returns registered services with the container. We cannot instantiate ServiceProvider<\/code> class because its constructors are marked with internal access modifier.<\/p>\n\n\n\n

      ServiceCollectionServiceExtensions<\/h2>\n\n\n\n

      The ServiceCollectionServiceExtensions<\/code> class includes extension methods related to service registrations which can be used to add services with lifetime. AddSingleton, AddTransient, AddScoped extension methods defined in this class.<\/p>\n\n\n\n

      ServiceCollectionContainerBuilderExtensions<\/h2>\n\n\n\n

      ServiceCollectionContainerBuilderExtensions<\/code> class includes BuildServiceProvider<\/code> extension method which creates and returns an instance of ServiceProvider<\/code>.<\/p>\n\n\n\n

      There are three ways to get an instance of IServiceProvider<\/code>:<\/p>\n\n\n\n

      Using IApplicationBuilder<\/strong><\/h3>\n\n\n\n

      We can get the services in Configure method using IApplicationBuilder’s ApplicationServices<\/code> property as shown below.<\/p>\n\n\n\n

      public <\/code>void Configure(IServiceProvider pro, IApplicationBuilder app, IHostingEnvironment env)<\/code><\/pre>\n\n\n\n
      {<\/code><\/pre>\n\n\n\n
          <\/code>var services = app.ApplicationServices;<\/code><\/pre>\n\n\n\n
          <\/code>var logger = services.GetService<ILog>() }<\/code><\/pre>\n\n\n\n
       <\/code><\/pre>\n\n\n\n
          <\/code>\/\/other code removed for clarity <\/code><\/pre>\n\n\n\n
      }<\/code><\/pre>\n\n\n\n
      Using HttpContext<\/strong><\/h3>\n\n\n\n
      var services = HttpContext.RequestServices;<\/code><\/pre>\n\n\n\n
      var log = (ILog)services.GetService(<\/code>typeof(ILog));<\/code><\/pre>\n\n\n\n
      Using IServiceCollection<\/strong><\/h3>\n\n\n\n
      public <\/code>void ConfigureServices(IServiceCollection services)<\/code><\/pre>\n\n\n\n
      {<\/code><\/pre>\n\n\n\n
          <\/code>var serviceProvider = services.BuildServiceProvider();<\/code><\/pre>\n\n\n\n
       <\/code><\/pre>\n\n\n\n
      }<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
      ASP.NET Core: Built-in IoC Container ASP.NET Core framework includes built-in IoC container for automatic dependency injection. The built-in IoC container is a simple yet effective container. Let’s understand how the built-in IoC container works internally. The followings are important interfaces and classes for built-in IoC container: Interfaces: Classes: The following diagram illustrates the relationship between […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[],"class_list":["post-1738","post","type-post","status-publish","format-standard","hentry","category-asp-net-core"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"admin","author_link":"http:\/\/waqar-arshad.com\/index.php\/author\/waqar_29_1\/"},"uagb_comment_info":28,"uagb_excerpt":"ASP.NET Core: Built-in IoC Container ASP.NET Core framework includes built-in IoC container for automatic dependency injection. The built-in IoC container is a simple yet effective container. Let’s understand how the built-in IoC container works internally. The followings are important interfaces and classes for built-in IoC container: Interfaces: Classes: The following diagram illustrates the relationship between…","_links":{"self":[{"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/posts\/1738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/comments?post=1738"}],"version-history":[{"count":1,"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/posts\/1738\/revisions"}],"predecessor-version":[{"id":1740,"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/posts\/1738\/revisions\/1740"}],"wp:attachment":[{"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/media?parent=1738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/categories?post=1738"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/waqar-arshad.com\/index.php\/wp-json\/wp\/v2\/tags?post=1738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}