Question

我让我的程序运行但我似乎无法输出我拥有的存储信息。当我运行程序时，所有行都是空白的。代码还有更多，但我认为这是程序用来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

问题是您在父public Telephone(string manufacturer, string model, string phoneNumber)课程中的空白构造函数 Telephone，您没有在其中设置任何属性，只是忽略了您不参与的参数得到任何输出。

修改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;
}

在您的子课程LandlinePhone中，您正在设置属性HasCord，我相信您应该在行中获得输出YES：

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

您最后还可以添加Console.ReadLine()，以便在Visual Studio的调试过程中查看输出。

Answer 2

public Telephone(string manufacturer, string model, string phoneNumber)
{
//You did not assign the inputs to the properties in your class.
   Manufacturer = manufacturer;
   Model = model;
   phoneNumber;

}

无法输出存储的信息

2 个答案: