Access modifiers in C # keywords protected

Https://msdn.microsoft.com/zh-cn/library/bcd5672a.aspx

The official statement is that the protected keyword is a member access modifier. A protected member is accessible within it class and by derived class instances.

The protected keyword is a member access modifier. A member of a protected, a protected member, that is accessible by an instance of its derived class in the class in which it resides.

An introduction to the accessibility level:

Https://msdn.microsoft.com/zh-cn/library/ba0a1yw2.aspx

Protected:access is limited to the containing class or types derived from the containing class.

Protected keyword: Access can only be accessed by the containing class, or from a class that contains the Member's class.

The place of doubt: wrong point of view I thought that as long as it was an instance of a derived class, you could access the protected member .

Http://blogs.msdn.com/b/ericlippert/archive/2005/11/09/why-can-t-i-access-a-protected-member-from-a-derived-class.aspx

Class Ungulate {

protected virtual void Eat () {/* whatever */}
}

Class Zebra:ungulate {
protected override void Eat () {/* whatever */}
}

Class Giraffe:ungulate {
public static void Feedthem () {
Giraffe G1 = new Giraffe ();
ungulate g2 = new Zebra();
G1. Eat (); Fine
G2. Eat (); Compile-time Error "Cannot access protected member"
}
}

We can call ungulate.eat legally from Giraffe,

But we can ' t call the protected method zebra.eat from anything except zebra or a subclass of zebra.

Since The compiler cannot determine from the static analysis that we is not in this illegal situation, it must flag it as Being illegal.

Access modifiers in C # keywords protected