TextInfo.ToTitleCase Method
Converts the specified string to title case (except for words that are entirely in uppercase, which are considered to be acronyms)..
Namespace: System.Globalization
Assembly: mscorlib (in mscorlib.dll)
Parameters
- str
- Type: System.String
The string to convert to title case.
| Exception | Condition |
|---|---|
| ArgumentNullException | str is null. |
Generally, title casing converts the first character of a word to uppercase and the rest of the characters to lowercase. However, this method does not currently provide proper casing to convert a word that is entirely uppercase, such as an acronym. The following table shows the way the method renders several strings.
Input | Language | Expected result | Actual result |
|---|---|---|---|
war and peace | English | War and Peace | War And Peace |
Per anhalter durch die Galaxis | German | Per Anhalter durch die Galaxis | Per Anhalter Durch Die Galaxis |
les naufragés d'ythaq | French | Les Naufragés d'Ythaq | Les Naufragés D'ythaq |
As illustrated above, the ToTitleCase method provides an arbitrary casing behavior which is not necessarily linguistically correct. A linguistically correct solution would require additional rules, and the current algorithm is somewhat simpler and faster. We reserve the right to make this API slower in the future.
The current implementation of the ToTitleCase method yields an output string that is the same length as the input string. However, this behavior is not guaranteed and could change in a future implementation.
The following example changes the casing of a string based on the English (United States) culture, with the culture name en-US.
using System; using System.Globalization; public class SamplesTextInfo { public static void Main() { // Defines the string with mixed casing. string myString = "wAr aNd pEaCe"; // Creates a TextInfo based on the "en-US" culture. TextInfo myTI = 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 ) ); } } /* 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 */
The following example passes the ToTitleCase method each string in an array. The strings include proper title strings as well as acronyms. The strings are converted to title case by using the conventions of the en-US culture.
using System; using System.Globalization; public class Example { public static void Main() { string[] values = { "a tale of two cities", "gROWL to the rescue", "inside the US government", "sports and MLB baseball", "The Return of Sherlock Holmes", "UNICEF and children"}; TextInfo ti = CultureInfo.CurrentCulture.TextInfo; foreach (var value in values) Console.WriteLine("{0} --> {1}", value, ti.ToTitleCase(value)); } } // The example displays the following output: // a tale of two cities --> A Tale Of Two Cities // gROWL to the rescue --> Growl To The Rescue // inside the US government --> Inside The US Government // sports and MLB baseball --> Sports And MLB Baseball // The Return of Sherlock Holmes --> The Return Of Sherlock Holmes // UNICEF and children --> UNICEF And Children
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
