Having a Base Class access a Child's members in C# Inheritance?

I'm guessing your instantiating the wrong class. After adding your classes I wrote two programs This one fails with a null reference exception class Program { static void Main(string args) { GVProgram prog = new GVProgram(); Console. WriteLine(prog.isRunning()); } } This one does not class Program { static void Main(string args) { ProgramA prog = new ProgramA("foo"); Console.

WriteLine(prog.isRunning()); } }.

I'm guessing your instantiating the wrong class. After adding your classes I wrote two programs. This one fails with a null reference exception class Program { static void Main(string args) { GVProgram prog = new GVProgram(); Console.

WriteLine(prog.isRunning()); } } This one does not. Class Program { static void Main(string args) { ProgramA prog = new ProgramA("foo"); Console. WriteLine(prog.isRunning()); } }.

I suggest you make the GVProgram class 'abstract'. It might reveal the error (or at least help prevent similar errors in future).

Hmm, interesting. The only way this would reveal the error is if GVProgram was being instantiated directly instead of ProgramA -- that would certainly cause the problem! – Cameron Dec 20 '10 at 4:14 I set GVProgram as Abstract and I get the same result: the debugger complains that name is null.

– dragonmantank Dec 20 '10 at 4:41.

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