The C # programming Language Notes

1, not a thorough abstract

Even abstract class cannot ignore a member of the implemented interface, which is not allowed:

Interface in_one{
void A ();
}

Abstract class base_one:in_one{
}

This is still Java convenience, no matter what the purpose of C #

2,out parameters and pointers

Out subclasses cannot be converted to out base classes, and if conversion is allowed, type security is not guaranteed; that is, the out parameter is the pointer to the pointer, and the pointer to the parent class is not inherited from the child, so it cannot be converted



(The Java programming Language Notes)