CaseInsensitiveHashCodeProvider Class
Supplies a hash code for an object, using a hashing algorithm that ignores the case of strings.
Assembly: mscorlib (in mscorlib.dll)
| Name | Description | |
|---|---|---|
![]() | CaseInsensitiveHashCodeProvider() | Initializes a new instance of the CaseInsensitiveHashCodeProvider class using the Thread::CurrentCulture of the current thread. |
![]() | CaseInsensitiveHashCodeProvider(CultureInfo^) | Initializes a new instance of the CaseInsensitiveHashCodeProvider class using the specified System.Globalization::CultureInfo. |
| Name | Description | |
|---|---|---|
![]() ![]() | Default | Gets an instance of CaseInsensitiveHashCodeProvider that is associated with the Thread::CurrentCulture of the current thread and that is always available. |
![]() ![]() | DefaultInvariant | Gets an instance of CaseInsensitiveHashCodeProvider that is associated with CultureInfo::InvariantCulture and that is always available. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetHashCode(Object^) | Returns a hash code for the given object, using a hashing algorithm that ignores the case of strings. |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
CaseInsensitiveHashCodeProvider implements the IHashCodeProvider interface supporting case-insensitive comparisons on strings, just as CaseInsensitiveComparer implements the IComparer interface supporting case-insensitive comparisons on strings.
The objects used as keys by a Hashtable are required to override the Object::GetHashCode method (or the IHashCodeProvider interface) and the Object::Equals method (or the IComparer interface). The implementation of both methods or interfaces must handle case sensitivity the same way; otherwise, the Hashtable might behave incorrectly. For example, when creating a Hashtable, you must use this class with the CaseInsensitiveComparer class or any case-insensitive IComparer implementation.
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 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.



