How does dependency injection work in .NET Core?

Question

Aryan Kumar · Answer

Dependency injection (DI) is a software design pattern that allows us to decouple the dependencies of a class from the class itself. This makes our code more loosely coupled and easier to test and maintain.

In .NET Core, DI is implemented using the IServiceProvider interface. The IServiceProvider interface provides a way to get a service by its type. Services are typically registered with the IServiceProvider in the ConfigureServices method of the Startup class.

To inject a dependency into a class, we can use the constructor injection pattern. In constructor injection, we pass the dependency as a constructor argument. The following code shows an example of constructor injection:

Code snippet

public class MyClass(ILogger logger)
{
    private readonly ILogger _logger = logger;

    public void DoSomething()
    {
        _logger.LogInformation("Doing something");
    }
}

In this example, the MyClass class has a dependency on the ILogger interface. The dependency is injected into the class through the constructor.

We can also use property injection to inject dependencies into classes. In property injection, we set the dependency on a property of the class. The following code shows an example of property injection:

Code snippet

public class MyClass
{
    private readonly ILogger _logger;

    public ILogger Logger
    {
        get { return _logger; }
        set { _logger = value; }
    }

    public void DoSomething()
    {
        _logger.LogInformation("Doing something");
    }
}

In this example, the MyClass class has a dependency on the ILogger interface. The dependency is injected into the class through the Logger property.

DI is a powerful design pattern that can help us to create more loosely coupled and easier to test and maintain code. .NET Core provides a built-in DI framework that makes it easy to use DI in our applications.

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How does dependency injection work in .NET Core?

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