DiAttributes

Super-small and super-simple library for registering classes with the ASP.NET Core IServiceCollection using attributes.

GitHub: https://github.com/tobysmith568/di-attributes
NuGet: https://www.nuget.org/packages/DiAttributes

Scoped, Transient, and Singleton

Classes can be registered as any of these three types of dependency via the respective attributes:

using DiAttributes;

[Scoped]
public class MyService
{ ... }

This is the equivalent of having the following in your Startup.cs:

services.Scoped<MyService>();

You can also pass in a type as an argument to register the class against:

using DiAttributes;

public interface IMyService
{ ... }

[Scoped(typeof(IMyService))]
public class MyService : IMyService
{ ... }

This is the equivalent of having the following in your Startup.cs:

services.Scoped<IMyService, MyService>();

The use of these attributes will require you to add the following line once to your Startup.cs file:

services.RegisterDiAttributes();

Configuration

Classes can be automatically bound to sections of your app's configuration using the [Configuration] attribute.

If your appsettings.json looks like this:

{
  "Outer": {
    "Inner": {
      "MySetting": "My Value"
    }
  }
}

Then you can bind a class to the Inner object (for example) and register it with the IServiceCollection like this:

using DiAttributes;

[Configuration("Outer:Inner")]
public class MyInnerOptions
{
  public string MySetting { get; set; }
}

To use this attribute you will need to pass an ICollection instance to the RegisterDiAttributes call in your Startup.cs file:

services.RegisterDiAttributes(Configuration);

HttpClient

Classes can be registered as HttpClients using the HttpClient attribute.
As per the Microsoft Docs, these classes will be registered as transient.

using DiAttributes;

[HttpClient]
public class MyHttpClient
{
  public MyHttpClient(HttpClient httpClient)
  { ... }
}

This is the equivalent of having the following in your Startup.cs:

services.AddHttpClient<MyHttpClient>();

You can also pass in a type as an argument to register the class against:

public interface IMyHttpClient
{ ... }

[Scoped(typeof(IMyHttpClient))]
public class MyHttpClient : IMyHttpClient
{
  public MyHttpClient(HttpClient httpClient)
  { ... }
}

This is the equivalent of having the following in your Startup.cs:

services.AddHttpClient<IMyHttpClient, MyHttpClient>();

Licence

DiAttributes is licensed under the ISC License.