AutoIoc 1.2.1-beta01

AutoIoc

Are you familiar with adding services, options/configurations from app settings, and HTTP client classes to your dependency injection container? Examples of what I mean:

services.AddTransient<IFooBarService, FooBarService>();

services.AddOptions<HelloWorldConfiguration>()
    .Configure<IConfiguration>((settings, config) => { config.GetSection("HelloWorld").Bind(settings); });
    
services.AddTransient<AuthDelegatingHandler>();

services.AddHttpClient<IAnimeClient, AnimeClient>()
    .AddHttpMessageHandler<AuthDelegatingHandler>();
    
services.AddRefitClient<IColorClient>()
    .ConfigureHttpClient(c => {...})
    .AddHttpMessageHandler<AuthDelegatingHandler>();

Then your code eventually grows to look like:

services.AddSingleton<IService1, Service1>()
    .AddSingleton<IService2, Service2>()
    .AddSingleton<IService3, Service3>()
    /* pretend there are 100s of these */
    .AddSingleton<IService99, Service99>()
    .AddSingleton<IService100, Service100>();

Well this package makes that much easier. It will scan your assembly and fine items that need to be added to your DI container based on attributes.

NuGet Installation

Install the AutoIoc NuGet package:

dotnet add package AutoIoc

Usage

Add the following to your Startup.cs:

services.AddAutoIoc(configuration, assembly);

Services

Add services based on the lifetime you'd like to have them have:

public interface IExample {}

• Transient lifetime:

  // always add it to the concrete class as that is where your behavior lives
  [TransientService]
  public class Example : IExample {} 
  
  // this is equivalent to
  services.AddTransient<IExample, Example>();
  

• Scoped lifetime:

  // always add it to the concrete class as that is where your behavior lives
  [ScopedService]
  public class Example : IExample {} 
  
  // this is equivalent to
  services.AddScoped<IExample, Example>();
  

• Singleton lifetime:

  // always add it to the concrete class as that is where your behavior lives
  [SingletonService]
  public class Example : IExample {} 
  
  // this is equivalent to
  services.AddSingleton<IExample, Example>();
  

Options

Create your POCO class and add the following attribute with the desired app settings key:

// This will automatically bind the the key `Example`
[BindOptions]
public class ExampleConfiguration
{
    public string Foo { get; set; }
    public string Bar { get; set; }
}

// This will bind the the key `Foo:Bar`
[BindOptions("Foo:Bar")]
public class ExampleConfiguration
{
    public string Foo { get; set; }
    public string Bar { get; set; }
}

// now inject where desired
public class BananaService
{
    private readonly ExampleConfiguration _exampleConfiguration;
    
    public BananaService(IOptions<ExampleConfiguration> exampleConfigurationOptions)
    {
        _exampleConfiguration = exampleConfigurationOptions.Value;
    }
}

HTTP Client Class

Typical Route

Normally I see developer creating a client class that injects a name HTTP client from the factory like as follows:

public interface IDbzClient{}
public class DbzClient : IDbzClient
{
    private readonly HttpClient _httpClient;
    
    public DbzClient(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }
}

// add to your DI container
services.AddHttpClient<IDbzClient, DbzClient>();

Why not just attribute it?

public interface IDbzClient {}

// always add it to the implementation since this is where your behavior lives
[HttpClient]
public class DbzClient : IDbzClient {}

Refit Route

Love using Refit? Me too! Go ahead and add one extra attribute to your interface so you won't need to add another line to your Startup.cs:

[HttpClient]
public class IDbzClient
{
    [Get("/foo/bar")]
    Task<ApiResponse<string>> GetFooBarAsync();
}

// now inject where desired
public class BananaService
{
    private readonly IDbzClient _dbzClient;
    
    public BananaService(IDbzClient dbzClient)
    {
        _dbzClient = dbzClient;
    }
    
    public async void CallItAsync()
    {
        var result = await _dbzClient.GetFooBarAsync();
        
        if(result.IsSuccessStatusCode)
        {
            Console.WriteLine(result.Content);
        }
    }
}

Delegating Handlers

Need to add delegating handlers? Well this is how you used to do it:

public class AuthDelegatingHandler : DelegatingHandler { }

services.AddTransient<AuthDelegatingHandler>();
services.AddHttpClient<IExampleClient, ExampleClient>()
    .AddHttpMessageHandler<AuthDelegatingHandler>();

Now you can add as many as you want via attributes:

public class AuthDelegatingHandler : DelegatingHandler { }

// examples and order matters
[HttpClient(PrimaryHandler = typeof(CustomPrimaryHandler))]
[HttpClient(typeof(AuthDelegatingHandler), PrimaryHandler = typeof(CustomPrimaryHandler))]
[HttpClient(typeof(AuthDelegatingHandler), typeof(RandomDelegatingHandler), PrimaryHandler = typeof(CustomPrimaryHandler))]
[HttpClient(typeof(AuthDelegatingHandler))]  
[HttpClient(typeof(AuthDelegatingHandler), typeof(RandomDelegatingHandler))]  

Ping me if you want any new features added to the library ❤️