How to inject dependencies into an asp net core application from another project

Introduction

ASP.NET is a popular programming language used for building web applications. One common challenge developers face is how to inject dependencies into an ASP.NET Core application from another project. In this article, we will explore different approaches to solve this and to illustrate the .

Approach 1: Using Dependency Injection

ASP.NET Core provides a -in dependency injection (DI) framework that allows you to and resolve dependencies. To inject dependencies from another project, you need to follow these steps:

  1. an interface in the project the dependencies are defined. For example, let's say we have a project named “MyProject” and we want to inject dependencies into an ASP.NET Core application.
  2. In the “MyProject” project, define an interface for the dependency. For example:

public interface IMyDependency
{
    void DoSomething();
}
  1. In the ASP.NET Core application, add a reference to the “MyProject” project.
  2. In the ASP.NET Core application's Startup class, configure the DI container to use the implementation of the dependency from the “MyProject” project. For example:

public void ConfigureServices(IServiceCollection services)
{
    services.AddScoped();
}

Now, the ASP.NET Core application can inject the dependency by requesting an instance of the interface in its constructor or method parameters. For example:


public class MyController : Controller
{
    private readonly IMyDependency _myDependency;

    public MyController(IMyDependency myDependency)
    {
        _myDependency = myDependency;
    }

    // ...
}

Approach 2: Using Assembly Scanning

If you have multiple dependencies in the “MyProject” project and don't want to register each one in the ASP.NET Core application's Startup class, you can use assembly scanning to automatically register all dependencies. Here's how:

  1. In the “MyProject” project, add a reference to the Microsoft.Extensions.DependencyInjection.Abstractions package.
  2. In the ASP.NET Core application's Startup class, use assembly scanning to register all dependencies from the “MyProject” project. For example:

This approach automatically registers all classes that implement an interface in the “MyProject” project as dependencies in the ASP.NET Core application.

Conclusion

Injecting dependencies into an ASP.NET Core application from another project can be achieved using the built-in dependency injection framework or by using assembly scanning. Both approaches provide flexibility and maintainability in managing dependencies. Choose the approach that best suits your project's and architecture.

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