我如何更改 object 的值

Question

這是我的主要方法：

string input = Console.ReadLine(); // 2006 2000 false 1000 500 Windows
List<string> inputs = input.Split(" ").ToList();
Computer one = new Computer(int.Parse(inputs[0]), int.Parse(inputs[1]), bool.Parse(inputs[2]), double.Parse(inputs[3]), double.Parse(inputs[4]), inputs[5]);
one.Print(); // 2006, 2000, false, 1000, 500, Windows
input = Console.ReadLine(); //changeOperatingSystem
if (input == "changeOperatingSystem")
{
string newOperationSystem = Console.ReadLine(); //Linux
Computer two = new Computer(newOperationSystem);
}
one.Print(); //2006, 2000, false, 1000, 500, Linux

“//”標記輸入和 output 的樣子。 這是我的 Computer.cs：

private int years;
        private int price;
        private bool isNotebook;
        private double hardDiskMemory;
        private double freeMemory;
        private string operationSystem;
        private string newOperationSystem;

        public Computer(int years, int price, bool isNotebook, double hardDiskMemory, double freeMemory, string operationSystem)
        {
            Years = years;
            Price = price;
            IsNotebook = isNotebook;
            HardDiskMemory = hardDiskMemory;
            FreeMemory = freeMemory;
            OperationSystem = operationSystem;
        }
        public Computer(string newOperationSystem)
        {
            OperationSystem = newOperationSystem;
        }
        public int Years
        {
            get { return years; }
            set
            {
                years = value;
            }
        }
        public int Price
        {
            get { return price; }
            set
            {
                price = value;
            }
        }
        public bool IsNotebook
        {
            get { return isNotebook; }
            set
            {
                isNotebook = value;
            }
        }
        public double HardDiskMemory
        {
            get { return hardDiskMemory; }
            set
            {
                hardDiskMemory = value;
            }
        }
        public double FreeMemory
        {
            get { return freeMemory; }
            set
            {
                freeMemory = value;
            }
        }
        public string OperationSystem
        {
            get { return operationSystem; }
            set
            {
                operationSystem = value;
            }
        }
        
        public string NewOperationSystem
        {
            get { return NewOperationSystem; }
            set
            {
                newOperationSystem = value;
            }
        }

        public void Print()
        {
            Console.WriteLine($"{years}, {price}, {isNotebook}, {hardDiskMemory}, {FreeMemory}, {operationSystem}");
        }

我想讓這個程序做的是，只要用戶提交的輸入是"changeOperationSystem" ，程序就會給用戶另一個輸入，讓他們為 pc 提交新的操作系統。 然后使用構造函數，Computer.Cs 接收字符串newOperationSystem ，然后它應該替換值operationSystem ，就像我在構造函數中嘗試做的那樣： OperationSystem = newOperationSystem ，但它不起作用。 我還在上課，所以不要 go 對我太苛刻。

Answer 1

在我看來，您正在嘗試更改 class 的一個屬性。您所要做的就是使用屬性設置方法

one.OperationSystem = newOperationSystem;

並完全刪除屬性NewOperationSystem 。

這是使用構造函數實例化 class 然后更改其中一個屬性的基本框架代碼

public class Foo
{
    private int _a;
    private string _b;
    private readonly float _c;

    public Foo(int a, string b, float c)
    {
        _a = a;
        _b = b;
        _c = c;
    }

    public int A { get => _a; set => _a = value; }
    public string B { get => _b; set => _b = value; }
    public float C => _c;

    public override string ToString()
    {
        return $"{_a}, {_b}, {_c}";
    }
}
class Program
{
    static void Main(string[] args)
    {
        Foo one = new Foo(100, "Philip", 0.75f);

        Console.WriteLine(one);
        //100, Philip, 0.75

        one.B = "Spencer";

        Console.WriteLine(one);
        //100, Spencer, 0.75
        
    }
}

上面代碼的另一個特點是，如果您可以利用在Console.WriteLine()或任何其他操作期間自動調用的內置.ToString() ，則無需創建.Print()方法需要從我的 class 輸入字符串。

最后，我添加了一個只讀屬性C來證明這種設計是可行的。 你將無法寫出one.C = 0.25f; 因為該屬性是只讀的。