public interface IEntity 

{

    void doSomething();

}

​

public class Service

{

    private readonly IEntity _entity;

    public Service(IEntity _entity)

    {

    }

    // why this declaration???

    public IEntity Entity { get { return _entity; } }

    public void doWork()

    {

        // why not calling _entity directly

        Entity.doSomething();

    }

}

​

public class Program { public static void Main(){} }