Create class instance from string

Question

I have a C# method which creates a new instance of a class from a string, however, I get an error when running the code.

obj = (ClassX)Activator.CreateInstance(Type.GetType("classPrefix_" + className));

ArgumentNullException was unhandled

Value cannot be null

Parameter name: type

Any help on this error would be appreciated.

Answer 1

You probably don't have a type of "classPrefix_" plus whatever you have on className. The Type.GetType() call returns null and CreateInstance throws the ArgumentNullException.