Is there a function to check if an object is a builtin data type?

Question

I would like to see if an object is a builtin data type in C#

I don\'t want to check against all of them if possible.
That is, I don\'t want to do this:

Answer 1

Not directly but you can do the following simplified check

public bool IsBulitin(object o) {
  var type = o.GetType();
  return (type.IsPrimitive && type != typeof(IntPtr) && type != typeof(UIntPtr))
        || type == typeof(string) 
        || type == typeof(object) 
        || type == typeof(Decimal);
}

The IsPrimitive check will catch everything but string, object and decimal.

EDIT

While this method works, I would prefer Jon's solution. The reason is simple, check the number of edits I had to make to my solution because of the types I forgot were or were not primitives. Easier to just list them all out explicitly in a set.