C＃簡單構造函數重載

Question

我正在做一個非常簡單的重載構造函數練習，但是遇到了沒有重載的發現參數的情況。 我以為我做對了，但是也許我做錯了什么？

   namespace A3_Date_StudentWork
    {
        class MyDate
        {      


            private int newMonth;
            private int newDay;
            private int currentMonth;
            private int currentDay;

            public MyDate(int month, int day)
            {
               newMonth = month;
               newDay = day;
            }

            public MyDate(int month, int day, int cmonth, int cday)
            {
                newMonth = month;
                newDay = day;
                currentMonth = cmonth;
                currentDay = cday;
            }
        }
    }

這是我的主要新對象的樣子

    MyDate today = new MyDate(todayMonth, todayDay);

    MyDate bday = new MyDate(bdayMonth, bdayDay);

    MyDate combine = new MyDate(bdayMonth, bdayDay, todayMonth, todayDay);

這是一個非常簡單的程序，我所有的變量都是int。 我整個主：

    static void Main(string[] args)
    {

        int todayMonth = 0;
        int todayDay = 0;
        int bdayMonth = 0;
        int bdayDay = 0;


        Console.WriteLine("What is today's month?");
        Int32.TryParse(Console.ReadLine(), out todayMonth);
       // Console.WriteLine(todayMonth);

        Console.WriteLine("What is today's date?");
        Int32.TryParse(Console.ReadLine(), out todayDay);
       // Console.WriteLine(todayDay);

        Console.WriteLine("What is your birth month?");
        Int32.TryParse(Console.ReadLine(), out bdayMonth);
       // Console.WriteLine(bdayMonth);

        Console.WriteLine("What is your birth date?");
        Int32.TryParse(Console.ReadLine(), out bdayDay);
       // Console.WriteLine(bdayDay);

        MyDate today = new MyDate(todayMonth, todayDay);
        MyDate bday = new MyDate(bdayMonth, bdayDay);
        MyDate combine = new MyDate(bdayMonth, bdayDay, todayMonth, todayDay);

這是帶有構造函數的基類

    {
class MyDate
{      


    private int newMonth;
    private int newDay;
    private int currentMonth;
    private int currentDay;

    public MyDate(int month, int day)
    {
       newMonth = month;
       newDay = day;
    }

    public MyDate(int month, int day, int cmonth, int cday)
    {
        newMonth = month;
        newDay = day;
        currentMonth = cmonth;
        currentDay = cday;
    }

基類實際上是MyDate類

Answer 1

這里只是技術方面的建議。 當您有多個構造函數時，應盡可能通過傳遞值從一個構造函數中調用另一個。 這也稱為“構造函數鏈接”。

這是一個基於您的代碼的示例：

class MyDate
{
    private int newMonth;
    private int newDay;
    private int currentMonth;
    private int currentDay;

    public MyDate(int month, int day)
       : this(month, day, 0, 0)
    { }

    public MyDate(int month, int day, int cmonth, int cday)
    {
        newMonth = month;
        newDay = day;
        currentMonth = cmonth;
        currentDay = cday;
    }
}

在這種簡單情況下，當您使用2個參數（月和日）調用構造函數時，其他參數默認為0。 您還可以使參數可為空，以便可以為其分配空值。