From: Michael Kaplan (firstname.lastname@example.org)
Date: Fri Mar 24 2006 - 12:13:26 CST
On Fri, 24 Mar 2006 19:40:03 +0200, Jony Rosenne wrote
> Microsoft recommends for case insensitive comparisons:
> "DO: Use ToUpperInvariant rather than ToLowerInvariant when normalizing
> strings for comparison."
> I have seen similar recommendation elsewhere.
> However, I was under the impression that in Unicode it is better to
> do ToLower for removing case, because of the German SS.
> Which is better? Should the UTC take a position?
The Microsoft recommendation is based on the very real issue involving
identifier syntax on NT for the file system and for object names, which
uppercases (its an upcase and binary sort of comparison world). This could
actually cause problems on pretty much any pre-Vista platform.
Starting in Vista, the recommendation will no longer matter as much, but
since in the .NET Framework most people using it for development will be
targetting other platforms too, the recommendation will be around for some
time to come.
The Sharp S issue is not an issue for any shipping or under development
version of Windows since they all support only simple casing stuff -- thus no
sharp S in casing. It is around in collation and has been since NT 3.51 (and
maybe even NT 3.1).
I doubt the UTC needs to "take a position" beyond what they have done. They
give a recommendation and a reason for it; so does Microsoft. People can do
what they want with the information based on an intelligent review of the
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