1024programmer Asp.Net It’s enough to read one article about Autofac, the excellent dependency injection framework in .net.

It’s enough to read one article about Autofac, the excellent dependency injection framework in .net.

It’s enough to read one article about Autofac, the excellent dependency injection framework in .net

Autofac is a feature-rich .NET dependency injection container used to manage the life cycle of objects and resolve dependencies. And perform attribute injection. This article will explain in detail how to use Autofac, including various registration methods, attribute injection, and how to use multiple ContainerBuilder to register and merge components. We will provide detailed source code examples to illustrate each concept.

1. Install Autofac

First, make sure you have the Autofac NuGet package installed. You can install Autofac using the NuGet package manager or by running the following command from the console:

Install-Package Autofac
 

2. Create a simple console application

We’ll start with a simple console application to demonstrate basic usage of Autofac. We will create a container containing multiple components and demonstrate various registration methods and property injection methods.

Program.cs

using System;
 using Autofac;

 namespace AutofacExample
 {
     class Program
     {
         static void Main(string[] args)
         {
             // Step 1: Create ContainerBuilder
             var builder = new ContainerBuilder();

             // Step 2: Register the component
             builder.RegisterType().As().SingleInstance();
             builder.RegisterType().As().InstancePerLifetimeScope();
             builder.RegisterType().As().Named("ConsoleLogger");

             // Step 3: Build the container
             var container = builder.Build();

             // Step 4: Parse the component and perform attribute injection
             using (var scope = container.BeginLifetimeScope())
             {
                 var userRepository = scope.Resolve();
                 userRepository.AddUser("John Doe");

                 //Property injection example
                 var logger = scope.ResolveNamed("ConsoleLogger");
                 logger.Log("This is a log message with attribute injection.");
             }

             Console.WriteLine("Press Enter to exit...");
             Console.ReadLine();
         }
     }
 }
 

3. Create components and interfaces

Now, we will create three components DatabaseConnection, UserRepository and Logger, and the interfaces they implement.

DatabaseConnection.cs

public interface IDatabaseConnection
 {
     void Connect();
 }

 public class DatabaseConnection : IDatabaseConnection
 {
     public void Connect()
     {
         Console.WriteLine("Connected to the database.");
     }
 }
 

UserRepository.cs

public interface IUserRepository
 {
     void AddUser(string username);
 }

 public class UserRepository : IUserRepository
 {
     private readonly IDatabaseConnection _databaseConnection;

     public UserRepository(IDatabaseConnection databaseConnection)
     {
         _databaseConnection = databaseConnection;
     }

     public void AddUser(string username)
     {
         _databaseConnection.Connect();
         Console.WriteLine($"User '{username}' added to the database.");
     }
 }
 

Logger.cs

public interface ILogger
 {
     void Log(string message);
 }

 public class Logger : ILogger
 {
     public void Log(string message)
     {
         Console.WriteLine($"Logging: {message}");
     }
 }
 

4. Multiple registration methods

Autofac provides a variety of different component registration methods, allowing you to control the life cycle of components and resolve complex dependencies. �eInstance

();
builder.RegisterType().As().InstancePerLifetimeScope();
builder.RegisterType().As().Named(“ConsoleLogger”);

// Enable property injection
builder.RegisterCallback(PropertyInjector.InjectProperties);

var container = builder.Build();

Now, when UserRepository is parsed When , the Logger attribute will be automatically injected, thereby realizing attribute injection.

6. Use multiple ContainerBuilder to merge registration

Sometimes, you may need to register components in different modules or program parts. For this case, you can use multiple ContainerBuilder objects and eventually merge them into a main container. Here’s an example of how to accomplish this:

Program.cs (extension)

In the above example, we have created a container and registered the component. Now we’ll add an additional ContainerBuilder, register another component, and then merge them.

// Step 7: Register another component using another ContainerBuilder
 var builder2 = new ContainerBuilder();
 builder2.RegisterType().As();

 // Step 8: Merge ContainerBuilder
 builder.Update(builder2);
 

EmailSender.cs

public interface IEmailSender
 {
     void SendEmail(string to, string subject, string message);
 }

 public class EmailSender : IEmailSender
 {
     public void SendEmail(string to, string subject, string message)
     {
         Console.WriteLine($"Sending email to {to} with subject: {subject}");
         Console.WriteLine($"Message: {message}");
     }
 }
 

Now, we have registered a file named Extra component of EmailSender and merge it into the main container.

7. Using multiple ContainerBuilder examples

This is the complete sample code:

Program.cs (complete)

using System;
 using Autofac;

 namespace AutofacExample
 {
     class Program
     {
         static void Main(string[] args)
         {
             // Step 1: Create ContainerBuilder
             var builder = new ContainerBuilder();

             // Step 2: Register the component
             builder.RegisterType().As().SingleInstance();
             builder.RegisterType().As().InstancePerLifetimeScope();
             builder.RegisterType().As().Named("ConsoleLogger");

             // Step 3: Build the container
             var container = builder.Build();

             // Step 4: Parse the component and perform attribute injection
             using (var scope = container.BeginLifetimeScope())
             {
                 var userRepository = scope.Resolve();
                 userRepository.AddUser("John Doe");

                 //Property injection example
                 var logger = scope.ResolveNamed("ConsoleLogger");
                 logger.Log("This is a log message with attribute injection.");
             }

             // Step 7: Register another component using another ContainerBuilder
             var builder2 = new ContainerBuilder();
             builder2.RegisterType().As();

             // Step 8: Merge ContainerBuilder
             builder.Update(builder2);

             // Step 9: Parse the new component
             using (var scope = container.BeginLifetimeScope())
             {
                 var emailSender = scope.Resolve();
                 emailSender.SendEmail("[email protected]", "Hello", "This is a test email.");
             }

             Console.WriteLine("Press Enter to exit...");
             Console.ReadLine();
         }
     }
 }
 

This example demonstrates how to use multiple ContainerBuilder registers different components and merges them into a container. When the program runs, it outputs the following:

Connected to the database.
 User 'John Doe' added to the database.
 Logging: This is a log message with attribute injection.
 Sending email to [email protected] with subject: Hello
 Message: This is a test email.
 Press Enter to exit...
 

This shows that we successfully registered and merged the different components and that they work together.

Autofac is a powerful .NET dependency injection container that provides a variety of registration methods, property injection and merging Multiple ContainerBuilder functions allow you to more flexibly manage the life cycle of objects and resolve dependencies. Hopefully this example will help you better understand how to use Autofac and better apply dependency injection in your .NET projects. The powerful functions of Autofac make it an excellent dependency injection container suitable for various application scenarios.

class=”syl-page-code hljs sql highlighter-hljs”>Connected to the database.
User 'John Doe' added to the database.
Logging: This is a log message with attribute injection.
Sending email to [email protected] with subject: Hello
Message: This is a test email.
Press Enter to exit...

This shows that we successfully registered and merged the different components and that they work together.

Autofac is a powerful .NET dependency injection container that provides a variety of registration methods, property injection and merging Multiple ContainerBuilder functions allow you to more flexibly manage the life cycle of objects and resolve dependencies. Hopefully this example will help you better understand how to use Autofac and better apply dependency injection in your .NET projects. The powerful functions of Autofac make it an excellent dependency injection container suitable for various application scenarios.

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