String::ToLower Method (CultureInfo)
Returns a copy of this string converted to lowercase, using the casing rules of the specified culture.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- culture
- Type: System.Globalization::CultureInfo
An object that supplies culture-specific casing rules.
| Exception | Condition |
|---|---|
| ArgumentNullException | culture is nullptr. |
The casing rules of the culture specified by the culture parameter determine the way the case of the string is changed.
Note |
|---|
This method does not modify the value of the current instance. Instead, it returns a new string in which all characters in the current instance are converted to lowercase. |
Security Considerations
The casing operation that results from calling the ToLower method takes the casing conventions of the current culture into account. If you need the lowercase or uppercase version of an operating system identifier, such as a file name, named pipe, or registry key, use the ToLowerInvariant or ToUpperInvariant method. This produces the same result in every culture (unlike the ToLower method) and performs more efficiently.
The following example converts two strings of uppercase characters to lowercase characters using the English-United States and Turkish-Turkey cultures, then compares the lowercase strings. The uppercase strings are identical except that for each occurrence of the Unicode LATIN CAPITAL LETTER I in one string, the other string contains LATIN CAPITAL LETTER I WITH DOT ABOVE.
// Sample for String::ToLower(CultureInfo) using namespace System; using namespace System::Globalization; void CodePoints( String^ title, String^ s ) { Console::Write( "{0}The code points in {1} are: {0}", Environment::NewLine, title ); System::Collections::IEnumerator^ myEnum = s->GetEnumerator(); while ( myEnum->MoveNext() ) { UInt16 u = safe_cast<Char>(myEnum->Current); Console::Write( "{0:x4} ", u ); } Console::WriteLine(); } int main() { String^ str1 = "INDIGO"; // str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE). array<Char>^temp = {L'\u0130',L'N',L'D',L'\u0130',L'G',L'O'}; String^ str2 = gcnew String( temp ); String^ str3; String^ str4; Console::WriteLine(); Console::WriteLine( "str1 = '{0}'", str1 ); Console::WriteLine(); Console::WriteLine( "str1 is {0} to str2.", ((0 == String::CompareOrdinal( str1, str2 )) ? (String^)"equal" : "not equal") ); CodePoints( "str1", str1 ); CodePoints( "str2", str2 ); Console::WriteLine(); // str3 is a lower case copy of str2, using English-United States culture. Console::WriteLine( "str3 = Lower case copy of str2 using English-United States culture." ); str3 = str2->ToLower( gcnew CultureInfo( "en-US",false ) ); // str4 is a lower case copy of str2, using Turkish-Turkey culture. Console::WriteLine( "str4 = Lower case copy of str2 using Turkish-Turkey culture." ); str4 = str2->ToLower( gcnew CultureInfo( "tr-TR",false ) ); // Compare the code points in str3 and str4. Console::WriteLine(); Console::WriteLine( "str3 is {0} to str4.", ((0 == String::CompareOrdinal( str3, str4 )) ? (String^)"equal" : "not equal") ); CodePoints( "str3", str3 ); CodePoints( "str4", str4 ); } /* This example produces the following results: str1 = 'INDIGO' str1 is not equal to str2. The code points in str1 are: 0049 004e 0044 0049 0047 004f The code points in str2 are: 0130 004e 0044 0130 0047 004f str3 = Lower case copy of str2 using English-United States culture. str4 = Lower case copy of str2 using Turkish-Turkey culture. str3 is equal to str4. The code points in str3 are: 0069 006e 0064 0069 0067 006f The code points in str4 are: 0069 006e 0064 0069 0067 006f */
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Note