StringComparer::OrdinalIgnoreCase Property
Updated: August 2010
Gets a StringComparer object that performs a case-insensitive ordinal string comparison.
Assembly: mscorlib (in mscorlib.dll)
The StringComparer returned by the OrdinalIgnoreCase property treats the characters in the strings to compare as if they were converted to uppercase using the conventions of the invariant culture, and then performs a simple byte comparison that is independent of language. This is most appropriate when comparing strings that are generated programmatically or when comparing case-insensitive resources such as paths and filenames.
The OrdinalIgnoreCase property actually returns an instance of an anonymous class derived from the StringComparer class.
The following code example demonstrates the properties and the Create method of the StringComparer class. The example illustrates how different StringComparer objects sort three versions of the Latin letter I.
// This example demonstrates members of the // System::StringComparer class. using namespace System; using namespace System::Collections; using namespace System::Collections::Generic; using namespace System::Globalization; using namespace System::Threading; void Display(List<String^>^ stringList, String^ title) { Char firstChar; int codePoint; Console::WriteLine(title); for each (String^ s in stringList) { firstChar = s[0]; codePoint = Convert::ToInt32(firstChar); Console::WriteLine("0x{0:x}", codePoint); } Console::WriteLine(); } int main() { // Create a list of string. List<String^>^ stringList = gcnew List<String^>(); // Get the tr-TR (Turkish-Turkey) culture. CultureInfo^ turkishCulture = gcnew CultureInfo("tr-TR"); // Get the culture that is associated with the current thread. CultureInfo^ currentCulture = Thread::CurrentThread->CurrentCulture; // Get the standard StringComparers. StringComparer^ invariant = StringComparer::InvariantCulture; StringComparer^ invariantIgnoreCase = StringComparer::InvariantCultureIgnoreCase; StringComparer^ current = StringComparer::CurrentCulture; StringComparer^ currentIgnoreCase = StringComparer::CurrentCultureIgnoreCase; StringComparer^ ordinal = StringComparer::Ordinal; StringComparer^ ordinalIgnoreCase = StringComparer::OrdinalIgnoreCase; // Create a StringComparer that uses the Turkish culture and ignores // case. StringComparer^ turkishIgnoreCase = StringComparer::Create(turkishCulture, true); // Define three strings consisting of different versions of the // letter I. LATIN CAPITAL LETTER I (U+0049) String^ capitalLetterI = "I"; // LATIN SMALL LETTER I (U+0069) String^ smallLetterI = "i"; // LATIN SMALL LETTER DOTLESS I (U+0131) String^ smallLetterDotlessI = L"\u0131"; // Add the three strings to the list. stringList->Add(capitalLetterI); stringList->Add(smallLetterI); stringList->Add(smallLetterDotlessI); // Display the original list order. Display(stringList, "The original order of the list entries..."); // Sort the list using the invariant culture. stringList->Sort(invariant); Display(stringList, "Invariant culture..."); stringList->Sort(invariantIgnoreCase); Display(stringList, "Invariant culture, ignore case..."); // Sort the list using the current culture. Console::WriteLine("The current culture is \"{0}\".", currentCulture->Name); stringList->Sort(current); Display(stringList, "Current culture..."); stringList->Sort(currentIgnoreCase); Display(stringList, "Current culture, ignore case..."); // Sort the list using the ordinal value of the character code points. stringList->Sort(ordinal); Display(stringList, "Ordinal..."); stringList->Sort(ordinalIgnoreCase); Display(stringList, "Ordinal, ignore case..."); // Sort the list using the Turkish culture, which treats LATIN SMALL // LETTER DOTLESS I differently than LATIN SMALL LETTER I. stringList->Sort(turkishIgnoreCase); Display(stringList, "Turkish culture, ignore case..."); } /* This code example produces the following results: The original order of the list entries... 0x49 0x69 0x131 Invariant culture... 0x69 0x49 0x131 Invariant culture, ignore case... 0x49 0x69 0x131 The current culture is "en-US". Current culture... 0x69 0x49 0x131 Current culture, ignore case... 0x49 0x69 0x131 Ordinal... 0x49 0x69 0x131 Ordinal, ignore case... 0x69 0x49 0x131 Turkish culture, ignore case... 0x131 0x49 0x69 */
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