Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

StringComparer::InvariantCulture Property

 

Gets a StringComparer object that performs a case-sensitive string comparison using the word comparison rules of the invariant culture.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public:
property StringComparer^ InvariantCulture {
	static StringComparer^ get();
}

Property Value

Type: System::StringComparer^

A new StringComparer object.

TheStringComparer returned by the InvariantCulture property compares strings in a linguistically relevant manner, but it is not suitable for display in any particular culture. Its major application is to order strings in a way that will be identical across cultures.

The invariant culture is the CultureInfo object returned by the InvariantCulture property.

The InvariantCulture 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

*/

.NET Framework
Available since 2.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Return to top
Show:
© 2017 Microsoft