CaseInsensitiveComparer::DefaultInvariant Property
Gets an instance of CaseInsensitiveComparer that is associated with CultureInfo::InvariantCulture and that is always available.
Assembly: mscorlib (in mscorlib.dll)
public: property CaseInsensitiveComparer^ DefaultInvariant { static CaseInsensitiveComparer^ get(); }
Property Value
Type: System.Collections::CaseInsensitiveComparer^An instance of CaseInsensitiveComparer that is associated with CultureInfo::InvariantCulture.
Comparison procedures use the CultureInfo::InvariantCulture to determine the sort order and casing rules. String comparisons might have different results depending on the culture. For more information on culture-specific comparisons, see the System.Globalization namespace and Globalizing and Localizing .NET Framework Applications.
The following code example creates a case-sensitive hash table and a case-insensitive hash table and demonstrates the difference in their behavior, even if both contain the same elements.
using namespace System; using namespace System::Collections; using namespace System::Globalization; int main() { // Create a Hashtable using the default hash code provider and the default comparer. Hashtable^ myHT1 = gcnew Hashtable; myHT1->Add( "FIRST", "Hello" ); myHT1->Add( "SECOND", "World" ); myHT1->Add( "THIRD", "!" ); // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer, // based on the culture of the current thread. Hashtable^ myHT2 = gcnew Hashtable( gcnew CaseInsensitiveHashCodeProvider,gcnew CaseInsensitiveComparer ); myHT2->Add( "FIRST", "Hello" ); myHT2->Add( "SECOND", "World" ); myHT2->Add( "THIRD", "!" ); // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer, // based on the InvariantCulture. Hashtable^ myHT3 = gcnew Hashtable( CaseInsensitiveHashCodeProvider::DefaultInvariant,CaseInsensitiveComparer::DefaultInvariant ); myHT3->Add( "FIRST", "Hello" ); myHT3->Add( "SECOND", "World" ); myHT3->Add( "THIRD", "!" ); // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer, // based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i". CultureInfo^ myCul = gcnew CultureInfo( "tr-TR" ); Hashtable^ myHT4 = gcnew Hashtable( gcnew CaseInsensitiveHashCodeProvider( myCul ),gcnew CaseInsensitiveComparer( myCul ) ); myHT4->Add( "FIRST", "Hello" ); myHT4->Add( "SECOND", "World" ); myHT4->Add( "THIRD", "!" ); // Search for a key in each hashtable. Console::WriteLine( "first is in myHT1: {0}", myHT1->ContainsKey( "first" ) ); Console::WriteLine( "first is in myHT2: {0}", myHT2->ContainsKey( "first" ) ); Console::WriteLine( "first is in myHT3: {0}", myHT3->ContainsKey( "first" ) ); Console::WriteLine( "first is in myHT4: {0}", myHT4->ContainsKey( "first" ) ); } /* This code produces the following output. Results vary depending on the system's culture settings. first is in myHT1: False first is in myHT2: True first is in myHT3: True first is in myHT4: False */
Available since 10
.NET Framework
Available since 1.1