unity-container Getting started with unity-container Hello World

Example

interface IGreeter
{
    void Greet();
}

class Greeter : IGreeter
{
    public void Greet()
    {
        Console.WriteLine("Hello World");
    }
}

class SpanishGreeter : IGreeter
{
    public void Greet()
    {
        Console.WriteLine("Hola Mundo");
    }
}

class FrenchGreeter : IGreeter
{
    public void Greet()
    {
        Console.WriteLine("Bonjour le Monde");
    }
}

class Program
{
    static void Main(string[] args)
    {
        var container = new UnityContainer()
            .RegisterType<IGreeter, SpanishGreeter>("spanish")
            .RegisterType<IGreeter, FrenchGreeter>("french")
            .RegisterType<IGreeter, Greeter>();

        //Get default registration. Outputs "Hello World"
        var greeter = container.Resolve<IGreeter>();
        greeter.Greet();

        //Get specific named registration. Outputs "Hola Mundo"
        greeter = container.Resolve<IGreeter>("spanish");
        greeter.Greet();

        //Get all named registrations (excludes the default one)
        //Outputs "Hola Mundo" and "Bonjour le Monde"
        foreach (var g in container.ResolveAll<IGreeter>())
        {
            g.Greet();
        }

        Console.ReadLine();
    }
}