c# - 无法输出存储的信息

Question

我的程序可以运行，但我似乎无法输出我所拥有的存储信息。当我运行程序时，所有行都是空白的。代码还有更多内容，但我认为这是程序用于输出信息的主要代码。

    class Display
{
    public static void Main(string[] args)
    {
        LandlinePhone yourHomePhone = new LandlinePhone("VTech", "V-4321", "219-999-2345", true);
        Console.WriteLine("Manufacturer: {0}", yourHomePhone.Manufacturer);
        Console.WriteLine("Model: {0}", yourHomePhone.Model);
        Console.WriteLine("Phone Number: {0}", yourHomePhone.PhoneNumber);
        Console.WriteLine("Cordless: {0}", (yourHomePhone.HasCord ? "Yes" : "No"));
}

{
class LandlinePhone : Telephone
{
    private bool hasCord;

    public LandlinePhone()
    {
    }
    public LandlinePhone(string manufacturer, string model, string phoneNumber, bool hasCord)
            : base(manufacturer, model, phoneNumber)
    {
        hasCord = HasCord;
    }

    public bool HasCord
    {
        get
        {
            if (hasCord == true)
            {
                return true;

            }
            else
            {
                return false;
            }

        }
        set
        {
            hasCord = value;
        }
    }

    new public void display()
    {
        base.display();
        Console.WriteLine(HasCord ? "Cordless: Yes" : "Cordless: No");
    }
}


class Telephone
{
    public bool isConnected = true;
    public string lastNumberDialed;
    private string manufacturer;
    private string model;
    private string phoneNumber;



    public Telephone()
    {
    }

    public Telephone(string manufacturer, string model, string phoneNumber)
    {
    }

    public string Manufacturer
    {
        get
        {
            return manufacturer;
        }
        set
        {
            manufacturer = value;
        }
    }

    public string Model
    {
        get
        {
            return model;
        }
        set
        {
            model = value;
        }

    }
    public string PhoneNumber
    {
        get
        {
            return phoneNumber;
        }
        set
        {
            phoneNumber = value;
        }
    }
    public void display()
    {
        Console.WriteLine();
        Console.WriteLine("Manufacturer: {0}", Manufacturer);
        Console.WriteLine("Model: {0}", Model);
        Console.WriteLine("Phone Number: {0}", PhoneNumber);
    }

Answer 1

问题是你的 blank constructor public Telephone(string manufacturer, string model, string phoneNumber) 在父 Telephone 类中，你是不在那里设置任何属性，只是忽略参数，这就是您没有获得任何输出的原因。

修改您的构造函数并将属性设置为:

public Telephone(string manufacturer, string model, string phoneNumber)
{
   Manufacturer = manufacturer;
   Model = model;
   PhoneNumber = phoneNumber;
}

在您的子类 LandlinePhone 中，您正在设置属性 HasCord，我相信您应该针对行获得输出 YES:

Console.WriteLine("Cordless: {0}", (yourHomePhone.HasCord ? "Yes" : "No"));

您还可以在末尾添加 Console.ReadLine() 以便您可以在 visual studio 的调试过程中看到输出。