当private、protected润色class

当private、protected修饰class
书中描述修饰class访问权限有四个级别：public、internal、protected、private

做过一年C#，我见过public class ClassName{...}，也见过internal class ClassName{...}，但怎么就没见到private class ClassName{...} 和 protected class ClassName{...}呢？

我不明白用private和protected声明类是什么意思，代表什么意义？类 class c#
[解决办法]

引用:

Quote: 引用:

类里也可以定义类的
* Types declared in compilation units or namespaces can have public or internal declared accessibility and default to internal declared accessibility.
* Class members can have any of the five kinds of declared accessibility and default to private declared accessibility. (Note that a type declared as a member of a class can have any of the five kinds of declared accessibility, whereas a type declared as a member of a namespace can have only public or internal declared accessibility.)

来自
3.5.1 Declared accessibility
http://msdn.microsoft.com/en-us/library/aa691127(v=vs.71).aspx

你说的嵌套类吧，那么就说这两个东西只有在类中声明嵌套类才有意义了？

是的，嵌套类。
不是嵌套类不允许使用private, protected和protected internal
会报错:Elements defined in a namespace cannot be explicitly declared as private, protected, or protected internal

当private、protected润色class

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