[Mono-dev] ChangeType for Nullable
martin at ximian.com
Mon Jun 19 10:40:48 EDT 2006
On Wed, 2006-05-24 at 09:31 -0700, tut wrote:
> Also i'd like to know if one of next expressions should return true:
> 1) typeof(int?).IsSubclassOf(typeof(Nullable<>))
> 2) typeof(int?).IsSubclassOf(typeof(Nullable))
neither of these should return true.
2.) this is `System.Nullable' - ie. the non-generic static class - and
of course, no type can be a subclass of that.
1.) and again, you're comparing two different things:
typeof(int?) is an instantiated generic type while
typeof(Nullable<>) is the corresponding generic type definition; so
this doesn't work.
would be correct - comparing two instantiated generic types - but
typeof(int?) is actually an instance of Nullable<int> - and not
a subclass of it.
4.) typeof(int?) == typeof(Nullable<int>)
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