TextInfo.ToLower Method (String)
Converts the specified string to lowercase.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- str
-
Type:
System.String
The string to convert to lowercase.
| Exception | Condition |
|---|---|
| ArgumentNullException | str is null. |
The returned string might differ in length from the input string. For more information on casing, refer to the Unicode Technical Report #21 "Case Mappings," published by the Unicode Consortium (http://www.unicode.org). The current implementation preserves the length of the string. However, this behavior is not guaranteed and could change in future implementations.
Casing semantics depend on the culture in use. For the invariant culture, the casing semantics are not culture-sensitive. For a specific culture, the casing semantics are sensitive to that culture.
If a security decision depends on a string comparison or a case-change operation, the application should use the InvariantCulture to ensure that the behavior is consistent regardless of the culture settings of the system. However, the invariant culture must be used only by processes that require culture-independent results, such as system services. Otherwise, it produces results that might be linguistically incorrect or culturally inappropriate.
For more information on cultures, see CultureInfo.
The following code example changes the casing of a string based on the English (United States) culture, with the culture name en-US.
Imports System Imports System.Globalization Public Class SamplesTextInfo Public Shared Sub Main() ' Defines the string with mixed casing. Dim myString As String = "wAr aNd pEaCe" ' Creates a TextInfo based on the "en-US" culture. Dim myTI As TextInfo = New CultureInfo("en-US", False).TextInfo ' Changes a string to lowercase. Console.WriteLine("""{0}"" to lowercase: {1}", myString, myTI.ToLower(myString)) ' Changes a string to uppercase. Console.WriteLine("""{0}"" to uppercase: {1}", myString, myTI.ToUpper(myString)) ' Changes a string to titlecase. Console.WriteLine("""{0}"" to titlecase: {1}", myString, myTI.ToTitleCase(myString)) End Sub 'Main End Class 'SamplesTextInfo 'This code produces the following output. ' '"wAr aNd pEaCe" to lowercase: war and peace '"wAr aNd pEaCe" to uppercase: WAR AND PEACE '"wAr aNd pEaCe" to titlecase: War And Peace
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1