关于C#中的隐藏方法的使用
子类继承了父类,如果想要改变父类中的某个变量或者方法,虽然不可以直接删除父类中的成员,但是可以使用隐藏方法替换父类中的变量或者方法。但是需要注意的是,如果只是替换掉了父类中的变量,但是方法还是执行的父类中的方法,那么方法所使用到的变量的值还是父类中 变量的值,除非在子类中也重写一遍方法,否则只能在外部写函数达到目的。几张图说明一切:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace pet
{
public class pet
{
public string name="wuhao";
#if false
public void xianshi()
{
Console.WriteLine("pet's name is:"+name);
}
#endif
}
public class dog : pet
{
public uint age;
// new public string name = "xiaozhuang";
#if false
new public void xianshi()
{
Console.WriteLine("Dog's name is:"+name);
}
#endif
}
public class cat : pet
{
public uint age;
// new public string name = "jiyangyang";
#if false
public new void xianshi()
{
Console.WriteLine("Cat's name is:"+name);
}
#endif
}
class Program
{
static void Main(string[] args)
{
#if true
dog gou = new dog();
cat mao = new cat();
#endif
#if false
pet gou = new dog();
pet mao = new cat();
#endif
#if false
gou.xianshi();
mao.xianshi();
#endif
Console.WriteLine("Dog's name is:" + gou.name);
Console.WriteLine("Cat's name is:" + mao.name);
Console.Read();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace pet
{
public class pet
{
public string name="wuhao";
#if true
public void xianshi()
{
Console.WriteLine("pet's name is:"+name);
}
#endif
}
public class dog : pet
{
public uint age;
// new public string name = "xiaozhuang";
#if false
new public void xianshi()
{
Console.WriteLine("Dog's name is:"+name);
}
#endif
}
public class cat : pet
{
public uint age;
// new public string name = "jiyangyang";
#if false
public new void xianshi()
{
Console.WriteLine("Cat's name is:"+name);
}
#endif
}
class Program
{
static void Main(string[] args)
{
#if true
dog gou = new dog();
cat mao = new cat();
#endif
#if false
pet gou = new dog();
pet mao = new cat();
#endif
#if true
gou.xianshi();
mao.xianshi();
#endif
Console.WriteLine("Dog's name is:" + gou.name);
Console.WriteLine("Cat's name is:" + mao.name);
Console.Read();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace pet
{
public class pet
{
public string name="wuhao";
#if true
public void xianshi()
{
Console.WriteLine("pet's name is:"+name);
}
#endif
}
public class dog : pet
{
public uint age;
new public string name = "xiaozhuang";
#if false
new public void xianshi()
{
Console.WriteLine("Dog's name is:"+name);
}
#endif
}
public class cat : pet
{
public uint age;
new public string name = "jiyangyang";
#if false
public new void xianshi()
{
Console.WriteLine("Cat's name is:"+name);
}
#endif
}
class Program
{
static void Main(string[] args)
{
#if true
dog gou = new dog();
cat mao = new cat();
#endif
#if false
pet gou = new dog();
pet mao = new cat();
#endif
#if true
gou.xianshi();
mao.xianshi();
#endif
Console.WriteLine("Dog's name is:" + gou.name);
Console.WriteLine("Cat's name is:" + mao.name);
Console.Read();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace pet
{
public class pet
{
public string name="wuhao";
#if true
public void xianshi()
{
Console.WriteLine("pet's name is:"+name);
}
#endif
}
public class dog : pet
{
public uint age;
new public string name = "xiaozhuang";
#if true
new public void xianshi()
{
Console.WriteLine("Dog's name is:"+name);
}
#endif
}
public class cat : pet
{
public uint age;
new public string name = "jiyangyang";
#if true
public new void xianshi()
{
Console.WriteLine("Cat's name is:"+name);
}
#endif
}
class Program
{
static void Main(string[] args)
{
#if true
dog gou = new dog();
cat mao = new cat();
#endif
#if false
pet gou = new dog();
pet mao = new cat();
#endif
#if true
gou.xianshi();
mao.xianshi();
#endif
Console.WriteLine("Dog's name is:" + gou.name);
Console.WriteLine("Cat's name is:" + mao.name);
Console.Read();
}
}
}
最终结论是:子类的内容相当于父类的顺序扩展,作为局部变量,父类的方法在父类的变量被子类隐藏之前就被父类的方法所使用的话,子类的隐藏就不能起到作用。只要在隐藏生效以后再变量,就不会有问题了。