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Why are my privates accessible?
Why are private fields private to the type, not the instance?
很可能我遗漏了一个明显的事实，但我真的看不出原因:
当我覆盖 Equals() 方法并且当我将对象转换为我的类型时，我能够调用它的私有(private)成员没有任何问题!
我正在初始化一个实例，我希望它的私有(private)成员不可访问。
但是为什么被转换的对象在 Equals() 方法中向我开放它的私有(private)？
查看下面示例代码中的 Equals 实现，看看我是如何到达“that”实例上的私有(private)字段的:
public class Animal
{
private string _name;
private int _age;
public Animal(int age, string name)
{
_name = name;
_age = age;
}
public override bool Equals(object obj)
{
var that = (Animal) obj;
//_name and _age are available on "that" instance
// (But WHY ??? )
return
this._age == that._age
&& this._name == that._name;
}
}
class Program
{
static void Main(string[] args)
{
var cat1 = new Animal(5, "HelloKitty");
var cat2 = new Animal(5, "HelloKitty");
Console.Write(cat1.Equals(cat2));
Console.Read();
}
}