Sort a list of different objects by a common property

Question

I have a List<object> that contains instances of three types GuestbookEntry, Comment and SectionEntry. Those three classes have a common CreateDate property.

Is there any way that I am able to sort this list on a given property (which I know all the objects have) without knowing the type of the object?

Answer 1

If you can't make those two classes derive from a common Interface\ Base Class Which is the best Object Oriented solution.
You can cast the the list items to dynamic.

List<object> list = GetListFromSomeWhere();
var dynamicList = list.Cast<dynamic>();

Then sort the dynamic list without compilation errors:

dynamicList.OrderBy(x => x.CreateDate);