Question

Both the adapter class and the target class implement the same interface…why can I not treat them like the same object?

interface ISmartPhone
{
    string Name { get; set; }
    string Type { get; set; }

    void ShowTextWithImage();
}

    public class BasicFlipPhoneAdapter : ISmartPhone
{
    IBasicPhone basicPhone;
    public BasicFlipPhoneAdapter(IBasicPhone basicPhone)
    {
        this.basicPhone = basicPhone;
    }

    public string Name { get; set; }
    public string Type { get; set; }

    public void ShowTextWithImage()
    {
        basicPhone.ShowBasicText();
    }
}

public class iPhone : ISmartPhone
{
    public string Name { get; set; }
    public string Type { get; set; }

    public void ShowTextWithImage()
    {
        Console.WriteLine("O.o cool image!");
    }
}

Error occurs:

iPhone flipPhoneAdapter = new BasicFlipPhoneAdapter(flipPhone);

Answer 1

Because they’re not the same object type. A BasicFlipPhoneAdapter is not an iPhone. What you should be able to do is:

ISmartPhone flipPhoneAdapter = new BasicFlipPhoneAdapter(flipPhone);

Note the type of the flipPhoneAdapter variable – it’s ISmartPhone, not iPhone.