This example demonstrates how Unity Container could be used with ASP.NET web applications. In order to enable Unity as default dependency injection provider you need to follow two simple steps:

• Reference the Unity.Microsoft.DependencyInjection package from NuGet.

Install-Package Unity.Microsoft.DependencyInjection

• In the CreateHostBuilder add UseUnityServiceProvider(...) method

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .UseUnityServiceProvider(...)    <------ Add this line, you could pass IUnityContainer instance
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>();
        });

Unity allows several scenarios how it could be used:

• Direct replancement of native DI
• Instance of Unity is created and configured manually
• Instance of Unity is created manually and configured from configuration file

• If you want you could add method to your Startup class

public void ConfigureContainer(IUnityContainer container)
{
  // Could be used to register more types
  container.RegisterType<IMyService, MyService>();
}

By default ASP resolves controllers using built in activator. To enable resolution of controllers from Unity you need to add following line to MVC configuration:

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddControllersAsServices(); <-- Add this line
    ...
}