c#简单构造函数重载

本文关键字：重载 构造函数 简单 | 更新日期: 2023-09-27 18:05:30

我正在做一个非常简单的重载构造函数练习，但是我遇到了一个没有重载的参数。我以为我做得对，但也许我做错了什么?

   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;
            }
        }
    }

下面是main

中新建对象的样子
    MyDate today = new MyDate(todayMonth, todayDay);
    MyDate bday = new MyDate(bdayMonth, bdayDay);
    MyDate combine = new MyDate(bdayMonth, bdayDay, todayMonth, todayDay);

这是一个非常简单的程序，我所有的变量都是int。My整个Main:

    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);

这里是带有构造函数

的基类
    {
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;
    }

基类就是MyDate类

c#简单构造函数重载

这里只是一个技术方面的建议。当您有多个构造函数时，如果可能的话，您应该通过传递值从一个构造函数调用另一个构造函数。这也被称为"构造函数链接"。

下面是基于你的代码的一个例子:

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;
    }
}

在这个简单的例子中，当你用2个参数(月和日)调用构造函数时，其他参数默认为0。你也可以使参数为空，这样你就可以给它分配一个空值。

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