Question

The C# compiler complains about the following code containing new protected member declared in struct. What is the problem?

struct Foo {
    protected Object _bar;
}

Answer 1

Because this is a struct, it cannot be overridden. It seems the C# compiler wants sealed types like structs to use the ‘private’ keyword rather than the ‘protected’ keyword, even though functionally there isn’t any difference. Use this instead:

struct Foo {
    private Object _bar;
}