stevedunn / bindingtodefaultablelist

Dependency Injection Outline

This outline describes how dependency injection is implemented in the bindingtodefaultablelist project.

Dependency Injection Container

The project utilizes the Microsoft.Extensions.DependencyInjection framework to manage the dependency injection container. This framework provides a powerful and flexible way to register and resolve dependencies throughout the application.

Configuration

Configuration settings are loaded from a variety of sources, including:

  • Environment Variables: Configuration values can be set as environment variables.
  • Appsettings.json: A JSON file named appsettings.json located in the project’s root directory.
  • Appsettings.{Environment}.json: Environment-specific configuration files, such as appsettings.Development.json for the development environment.

Dependency Registration

Dependencies are registered within the dependency injection container using the IServiceCollection interface. This allows the application to define how services should be created and managed.

Example:

// In Startup.cs
          public void ConfigureServices(IServiceCollection services)
          {
              // Register an instance of the DefaultList class as a singleton
              services.AddSingleton<IDefaultList, DefaultList>();
          }

Dependency Resolution

Dependencies are resolved using the IServiceProvider interface. The container uses the registered information to create and provide instances of the requested dependencies.

Example:

// In a service class
          public class MyService
          {
              private readonly IDefaultList _defaultList;
          
              public MyService(IDefaultList defaultList)
              {
                  _defaultList = defaultList;
              }
          
              // ...
          }

Scopes

Dependency injection offers different scopes for managing the lifetime of registered services:

  • Singleton: A single instance is created and shared across the entire application.
  • Scoped: A new instance is created for each request within the same scope (e.g., a web request).
  • Transient: A new instance is created for each request.

Example:

// Register a service as scoped
          services.AddScoped<IMyService, MyService>();
          
          // Register a service as transient
          services.AddTransient<IMyOtherService, MyOtherService>();

Configuration Binding

The Microsoft.Extensions.Configuration framework is used to bind configuration values to properties of registered services. This allows developers to easily configure application behavior through configuration settings.

Example:

// In a service class
          public class MyService
          {
              private readonly string _connectionString;
          
              public MyService(IConfiguration configuration)
              {
                  _connectionString = configuration.GetConnectionString("MyDatabase");
              }
          
              // ...
          }

Further Documentation