interface IDependency
{
    void InjectDependencyFloor(IFloor floor);

    void InjectDependencyRoof(IRoof roof);

    void InjectDependencyWall(IWall wall);
}

class Shop: IDependency
{

    public IRoof roof;

    public IFloor floor;

    public IWall wall;

    public void InjectDependencyFloor(IFloor floor)
    {
        this.floor = floor;
    }

    public void InjectDependencyRoof(IRoof roof)
    {
        this.roof = roof;
    }

    public void InjectDependencyWall(IWall wall)
    {
        this.wall = wall;
    }
    //pozostałe metody
}

static void Main(string[] args)
{

    Shop shop = new Shop();
    shop.InjectDependencyFloor(new Floor());
    shop.InjectDependencyRoof(new Roof());
    shop.InjectDependencyWall(new Wall());

    Console.ReadKey();
}