Saturday, October 17, 2020

What is C# equivalent for: Dependency Injection / Inversion of Control for a developer with Java background

I recently joined a company that is a C#/.NET shop. I have been working primarilyc in the JVM ecosystem for backend through most of my professional work, so this is quite a big of change.

The language different is minor, but re-learning the ecosystem is quite another story.

Let us start with Dependency Injection / Inversion of Control Container. There are quite a bit few to choose from:

From my few conversation with developers coming from the .NET ecosystem, the default answer is always to go with the "official" Microsoft provided solution. So that is what I did. 

Perhaps the documentation is written for people completely new to programming. For those with a Java background and are familiar with the concept of DI and IoC, here is my take of a quick start guide.

Use Host from the Microsoft.Extensions.Hosting namespace and build your IHost

IHost host = Host.CreativeDefaultBuilder()
    .ConfigureServices(
    ( _, services ) => 
        services.AddSingleton<MyInterface, MyImplementationClass>()
            .AddSingleton<NextInterface, NextImplementationClass>()
            // ... ...
);

For thosse coming from the Spring world, this is approximately equivalent to:

@Configuration
public class MyConfig {
    @Bean
    public MyInterface myClass() {
        return new MyImplementationClass();
    }
}

Or Guice if you come from Guice:

Guice.createInjector(new AbstractModule() {
    @Override
    protected void configure() {
        bind(MyInterface.class).toInstance(new MyImplementationClass());
    }
});


Spring Boot take this a step further with its @ComponentScan and @Component magic. Does .NET have something similar? I do not know, if you do, please drop me a comment!

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