C#实现子类与父类的相互转换

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
namespace testApplication  
{  
 public class Parent  
    {  
        public int a=0;  
    }  
    public class Son:Parent  
    {  
        public int b=0;  
        public int run()  
        {  
            return a + b;  
        }  
    }  
    public class Son2 : Parent  
    {  
        public string c = "Son2";  
        public int run()  
        {  
            return a;  
        }  
    }  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            //不知道具体是哪个子类，因此先用父类来声明  
            List<Parent> sL = new List<Parent>();  
            Son cs1 = new Son(); cs1.b = -1;  
            Son cs2 = new Son(); cs2.b = -2;  
            sL.Add(cs1);  //子类可以强制转换成父类，即装箱 
            sL.Add(cs2);  
            for (int i = 0; i < 2;i++ )  
            {  
                //这里需要把父类再强制转换成子类（因为是装箱而来的父类，可以对其进行拆箱成子类）  
                //取出子类中的字段，即拆箱  
                Console.WriteLine(((Son)sL[i]).b);  
            }  
            Console.ReadLine();  
        }  
    }  
}  

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
namespace testApplication  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Parent pa = new Parent();  
            pa.a=9;  
            //设置一个临时的子类  
            Son tmpt = new Son();  
            tmpt.a = 9;  
            //进行装箱  
            pa = (Parent)tmpt;  
            //进行拆箱  
            Son cson = (Son)pa;  
            Console.WriteLine(cson.a);  
            Console.ReadLine();  
        }  
    }  
    public class Parent  
    {  
        public int a=0;  
    }  
    public class Son:Parent  
    {  
        public int b=0;  
        public int run()  
        {  
            return a + b;  
        }  
    }  
    public class Son2 : Parent  
    {  
        public string c = "Son2";  
        public int run()  
        {  
            return a;  
        }  
    }  
}  

/// <summary>
/// 动物类-父类
/// </summary>
public class Animal
{
    /// <summary>
    /// 脚
    /// </summary>
    public string Foot { get; set; }
    /// <summary>
    /// 头
    /// </summary>
    public string Head { get; set; }
}

/// <summary>
/// 狗类-继承动物类
/// </summary>
public class Dog : Animal
{
    /// <summary>
    /// 尾巴
    /// </summary>
    public string Tail { get; set; }
    /// <summary>
    /// 构造函数
    /// </summary>
    public Dog()
    {
        Head = "狗头";
        Foot = "狗腿";
        Tail = "狗尾巴";
    }
}

Dog dog = new Dog();
//转换为动物类---子类转换为父类
Animal animal = dog as Animal;

Animal animal = new Animal
{
    Foot = "脚",
    Head = "头"
};
Dog dog = new Dog
{
    Foot = animal.Foot,
    Head = animal.Head,
};

Animal animal = new Animal
{
    Foot = "脚",
    Head = "头"
};
Dog dog = new Dog();
//遍历Animal类的公共属性
foreach (PropertyInfo item in typeof(Animal).GetProperties())
{
    item.SetValue(dog, item.GetValue(animal));
}