Chapter 8, Question 4

mpm.developer · June 30th, 2014, 08:53 AM

This questions asks which syntax can be used to determine an objects type.

The answer key says the correct answer is d. Is there any reason why the correct answer is not a or d?

Answer a is
Type myType = typeof(myParameter);

Answer d is
Type myType = myParameter.GetType();

Rod Stephens · July 2nd, 2014, 11:39 PM

The parameter to typeof must be a type not an object. For example, the following code creates a Type object that represents the Person class:

Code:

Type personType = typeof(Person);

In contrast, if bob is a Person object, you can't do this:

Code:

Type bobType = typeof(bob);

You could use typeof if you knew what type of object bob was, but the question is about determining the object's type so that won't help you much.