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AutoRegisterInject, also referred to as ARI (pronounced AH-REE), is a C# source generator to automatically register types with Microsoft's Dependency Injection container based on one of four attributes.

[RegisterScoped]
public class Foo { }

Turns into

serviceCollection.AddScoped<Foo>();

AutoRegisterInject supports any environment where .NET Standard 2.0 can be referenced.

Installation

Install the package via Nuget, through dotnet add package AutoRegisterInject or add a package reference.

<PackageReference Include="AutoRegisterInject" />

AutoRegisterInject should be installed into every project where you wish to use its attributes and register services.

Usage

Getting started

Classes should be decorated with one of four attributes:

• [RegisterScoped]
• [RegisterSingleton]
• [RegisterTransient]
• [RegisterHostedService]

Register a class:

[RegisterScoped]
class Foo;

and get the following output:

serviceCollection.AddScoped<Foo>();

Update the service collection by invoking:

var serviceCollection = new ServiceCollection();
serviceCollection.AutoRegister();
serviceCollection.BuildServiceProvider();

You can now inject Foo as a dependency and have this resolved as scoped.

Alternatively, you can register hosted services by:

[RegisterHostedService]
class Foo;

and get:

serviceCollection.AddHostedService<Foo>();

Register as interface

Implement one or many interfaces on your target class:

[RegisterTransient]
class Bar : IBar;

and get the following output:

serviceCollection.AddTransient<IBar, Bar>();

Important note: AutoRegisterInject is opinionated and Bar will only be registered with its implemented interface. ARI will not register Bar. Bar will always need to be resolved from IBar in your code.

Implementing multiple interfaces will have the implementing type be registered for each distinct interface.

[RegisterTransient]
class Bar : IBar, IFoo, IBaz;

will output the following:

serviceCollection.AddTransient<IBar, Bar>();
serviceCollection.AddTransient<IFoo, Bar>();
serviceCollection.AddTransient<IBaz, Bar>();

Important note: AutoRegisterInject is opinionated and Bar will only be registered with its implemented interfaces. ARI will not register Bar. Bar will always need to be resolved from IBar, IFoo or IBaz in your code.

Multiple assemblies

In addition to the AutoRegister extension method, every assembly that AutoRegisterInject is a part of, a AutoRegisterFromAssemblyName will be generated. This allows you to configure your service collection from one, main, executing assembly.

Given 3 assemblies, MyProject.Main, MyProject.Services, MyProject.Data, you can configure the ServiceCollection as such:

var serviceCollection = new ServiceCollection();
serviceCollection.AutoRegisterFromMyProjectMain();
serviceCollection.AutoRegisterFromMyProjectServices();
serviceCollection.AutoRegisterFromMyProjectData();
serviceCollection.BuildServiceProvider();

AutoRegisterInject will remove illegal characters from assembly names in order to generate legal C# method names. ,, . and ឵ will be removed.

Ignoring interfaces

By default ARI will register a type with all the interfaces it implements, however this excludes System.IDisposable and its IAsyncDisposable counterpart.

You can ignore interfaces by telling ARI to explicitly register with only declared interfaces in the given attributes:

public interface IFoo { }
public interface IBar { }
[RegisterScoped(typeof(IBar))]
public class Foo;

this will result in Foo ONLY being registered as IBar and the following output:

serviceCollection.AddTransient<IBar, Foo>();

IFoo will be ignored entirely.

Where you want to register as multiple interfaces, you can pass multiple types.

[RegisterScoped(typeof(IBar), typeof(IFoo))]
public class Foo;

This works for all applicable attributes.