了解默认访问修饰符

Question

I am confused about access modifiers, so I thought I would ask a couple of quick questions for clarification:

Is it always the case that in the absence of access modifiers for data members of a class, the default is private , though the class itself is internal ?

class A
{
    int x;
}

So, int x is private int x and class A is internal class A ?

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Also, why would the following code not compile?

class A
{
    protected int x;
}

public class B : A
{}

Answer 1

As the documentation states, classes and structs are by default internal and their members are private.

The code won't compile because, as the error message will state, you cannot inherit from a less accessible class. In this case the child class would be public and the parent internal.