andmos / lightinject.microsoft.hosting Goto Github PK

This package enables LightInject to be used as the IoC container in a Asp.Net Core application.

dotnet add package LightInject.Microsoft.Hosting

public static IHostBuilder CreateHostBuilder(string[] args) =>
	Host.CreateDefaultBuilder(args)
  	.UseLightInject(services => services.RegisterFrom<CompositionRoot>())
    .ConfigureWebHostDefaults(webBuilder => webBuilder.UseStartup<Startup>());
              

Or from ASPNET 6 and onwards with minimal Program.cs setup:

var builder = WebApplication.CreateBuilder(args);
builder.Host.UseLightInject(sr => sr.RegisterFrom<CompositionRoot>());

The CompositionRoot class is usually placed in the host project (the project containing Program.cs) and is used to register services that are specific to LightInject

public class HostCompositionRoot : ICompositionRoot
{
	public void Compose(IServiceRegistry registry)
	{
		registry.RegisterScoped<IFoo, Foo>();			
	}
}

In general we could say that there are usually just two different lifetimes used in web applications. Services are either Scoped or Singletons. Scoped services are services that lives for the lifetime of the web request. An example would IDbConnection which gets created when the scope starts (web request start) and disposed when the scope ends (web request end). We register these services using the RegisterScoped method. Scoped services are only created once per scope even if injected into several other services during the web request. Singleton services are shared across web request and must be 100% thread safe. An example here could be a cache that is used for all web requests.