在C#中受保护的访问说明符和受保护的内部有什么区别

受保护的类可以从继承自定义它的类继承.

受保护的内部可以在从定义它的类派生的程序集OR类型中看到(包括来自其他程序集的类型).

见：http://msdn.microsoft.com/en-us/library/ba0a1yw2.aspx

从页面复制：

public              Access is not restricted.
protected           Access is limited to the containing class or types derived from the containing class.
internal            Access is limited to the current assembly.
protected internal  Access is limited to the current assembly or types derived from the containing class.
private             Access is limited to the containing type.