Re: String.Compare seems to fail when it should not

My bottom line is, if I control the data and I am 100% sure it won't contain
problematic chars, then by all means, I will use ordinal compare and get the
speed increase. Otherwise, as a non English native myself, I want to make my
apps international and so, I will use the culture aware comparison (and
other operations).

Sébastien
On Mon, Sep 8, 2008 at 3:21 PM, Sébastien Lorion <[email protected]
> wrote:

> string s1 = "Straße";
> string s2 = "STRASSE";
>
> int ordinal = string.Compare(s1, s2, StringComparison.OrdinalIgnoreCase);
> // = 140
> int current = string.Compare(s1, s2,
> StringComparison.CurrentCultureIgnoreCase); // = 0
>
> OrdinalIgnoreCase does not use Unicode conversion tables for making letters
> uppercase. It makes it faster, but also may produce unexpected results. The
> end result for non-english users is annoying.
>
> Sébastien
> On Mon, Sep 8, 2008 at 3:02 PM, Per Bolmstedt <discuss.develop.com@
> ul7.info> wrote:
>
>> Define "won't work". Also, can you shed some more light on why it "won't
>> work"?
>>
>> On Mon, 8 Sep 2008 14:32:02 -0400, =?ISO-8859-1?Q?S=E9bastien_Lorion?=
>> <[email protected]> wrote:
>>
>> >It won't work with international characters.
>> >
>> >Sébastien
>> >On Mon, Sep 8, 2008 at 2:19 PM, Per Bolmstedt
>> ><[email protected]>wrote:
>> >
>> >> On Mon, 8 Sep 2008 13:23:16 -0400, =?ISO-8859-1?Q?S=E9bastien_Lorion?=
>> >> <[email protected]> wrote:
>> >>
>> >>> by using OrdinalIgnoreCase, you are limiting yourself to only the
>> >>> first 128 chars of ASCII, which in 2008 is kinda out of fashion...
>> >>
>> >> How so?
>> >>
>> >> According to "New Recommendations for Using Strings in Microsoft .NET
>> >> "[1]; "Comparisons made using OrdinalIgnoreCase are behaviorally the
>> >> composition of two calls: calling ToUpperInvariant on both string
>> >> arguments, and doing an Ordinal comparison.".
>> >>
>> >> 1: http://msdn.microsoft.com/en-us/library/ms973919.aspx
>>
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