Question

I am having some trouble with assemblies and DLL’s.

instrument_ is declared as an object and I’m creating an instance of “PP150” from the dll whose path is specified by path_.

string className = ContineoProperties.getSingleton().getClassName(path_);
assembly_ = Assembly.LoadFrom(path_);
Type classType = assembly_.GetType("Instrument." + className);
instrument_ = Activator.CreateInstance(classType);

Later I to call the method isntrument_.instrumentCommand(cmd.getCommandName())

The error I get is with when i call the method.

‘object’ does not contain a definition for ‘instrumentCommand’

The isntrument_ is created fine. its just the method call that’s giving me a problem. The method does exist in the “PP150.dll”. Do I need some DLLImport to allow it to recognize it as a function?

Thanks,
P

Answer 1

If object type is not known in compile time,

To call a method defined on an object, you must use Reflection.

MethodInfo mInfo = classType.GetMethod("instrumentCommand");

mInfo.Invoke(instrument_, new Object[] { _parameters});