Dependency Injection in .NET with examples?

Question

Can someone explain dependency injection with a basic .NET example and provide a few links to .NET resources to extend on

Answer 1

Ninject must have one of the coolest sample out there: (pieced from the sample)

interface IWeapon {
  void Hit(string target);
}
class Sword : IWeapon {
  public void Hit(string target) {
    Console.WriteLine("Chopped {0} clean in half", target);
  }
}
class Shuriken : IWeapon {
  public void Hit(string target) {
    Console.WriteLine("Shuriken tossed on {0}", target);
  }
}
class Samurai {
  private IWeapon _weapon;

  [Inject]
  public Samurai(IWeapon weapon) {
    _weapon = weapon;
  }

  public void Attack(string target) {
    _weapon.Hit(target);
  }
}

class WeaponsModule: NinjectModule {
  private readonly bool _useMeleeWeapons;

  public WeaponsModule(bool useMeleeWeapons) {
    _useMeleeWeapons = useMeleeWeapons;
  }

  public void Load() {
    if (useMeleeWeapons)
      Bind().To();
    else
      Bind().To();
  }
}

class Program {
  public static void Main() {
    bool useMeleeWeapons = false;
    IKernel kernel = new StandardKernel(new WeaponsModule(useMeleeWeapons));
    Samurai warrior = kernel.Get();
    warrior.Attack("the evildoers");
  }
}

This, to me, reads very fluently, before you start up your dojo you can decide how to arm your Samurais.