program.cs

来自「csharp课本的源代码」· CS 代码 · 共 51 行

using System;
using System.Collections.Generic;
using System.Text;

namespace TypeExample
{
    //引用类型的RefTypeRectangle类的声明
    class RefTypeRectangle
    {
        public int Width;
        public int Heigth;
    }
    //值类型的ValTypeRectangle结构的声明
    struct ValTypeRetangle
    {
        public int Width;
        public int Heigth;
    }

    class Program
    {
        public static void Main()
        {
            //rect1和rect2均为引用类型的变量，且指向同一对象
            RefTypeRectangle rect1 = new RefTypeRectangle();
            rect1.Width = 10;
            rect1.Heigth = 15;
            RefTypeRectangle rect2 = rect1;
            Console.WriteLine("Dimensions of rect2 are" + rect2.Width + "x" + rect2.Heigth);
            Console.WriteLine("Changing dimensions of rect1...");
            //通过rect1更改对象的值一，此时由rect2得到的值即更改后的结果
            rect1.Width = 20;
            rect1.Heigth = 25;
            Console.WriteLine("Dimensions of rect2 now are" + rect2.Width + "x" + rect2.Heigth);
            //rect3和rect4均为值类型的变量，且初始值相同
            ValTypeRetangle rect3 = new ValTypeRetangle();
            rect3.Width = 10;
            rect3.Heigth = 15;
            ValTypeRetangle rect4 = rect3;
            Console.WriteLine("Dimensions of rect4 are" + rect4.Width + "x" + rect4.Heigth);
            Console.WriteLine("Changing dimensions of rect3...");
            //更改rect3的值，rect4的值不受影响
            rect3.Width = 20;
            rect3.Heigth = 25;
            Console.WriteLine("Dimensions of rect4 now are" + rect4.Width + "x" + rect4.Heigth);
            //按回车键结束
            Console.ReadLine();
        }
    }
}