Hi Alexander, My understanding based on the documentation is that StringComparison.Ordinal is essentially a C strcmp (in fact, it may be implemented as such under the hood, via an icall to the C runtime code), and StringComparison.Invariant is aware of surrogate pairs and composed characters, and is a linguistic comparison (ie. this *letter* comes before the other, not this character code).
--Bojan 2010/7/22 Alexander M. Batishchev <[email protected]> > Michael, could you please clarify the difference between Ordinal and > Invariant string comparison? > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Michael > Hutchinson > Sent: Thursday, July 22, 2010 12:29 AM > To: David S > Cc: [email protected]; wtftc > Subject: Re: [Mono-list] String comparisons slow > > On Wed, Jul 21, 2010 at 3:30 PM, David S <[email protected]> wrote: > > Ok. Now I'm confused. How come "CurrentCulture" for US/ENG doesn't just > run > > the Ordinal??? Perhaps there are some weird alphabetizing things I just > > don't understand. BTW, Thanks for tell us about the StringComparer class. > I > > never knew that existed. > > Note also that some string methods have overloads for taking specific > cultures, or the StringComparison enum. Both StringComparison.Ordinal > and StringComparison.OrdinalIgnoreCase (as well as StringComparer) can > be very useful to improve performance when culture-dependent behaviour > is not needed or desirable. > > Culture-dependent string comparisons are a very complex topic. There's > also an "invariant" culture for doing things in a culture-independent > way. > > -- > Michael Hutchinson > http://mjhutchinson.com > _______________________________________________ > Mono-list maillist - [email protected] > http://lists.ximian.com/mailman/listinfo/mono-list > > _______________________________________________ > Mono-list maillist - [email protected] > http://lists.ximian.com/mailman/listinfo/mono-list >
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