String.ToUpperInvariant
String.ToUpperInvariant
String.ToUpperInvariant
String.ToUpperInvariant
Method
Definition
Returns a copy of this String object converted to uppercase using the casing rules of the invariant culture.
public:
System::String ^ ToUpperInvariant();
public string ToUpperInvariant ();
member this.ToUpperInvariant : unit -> string
Public Function ToUpperInvariant () As String
Returns
Examples
The following example defines a string array that contains a single word in a number of languages. The ToUpperInvariant method is used to populate the elements of a parallel array with the case-insensitive version of each word. The Array.Sort<TKey,TValue>(TKey[], TValue[], IComparer<TKey>) method is used to sort the case-sensitive array based on the order of elements in the uppercase array to ensure that elements appear in the same order regardless of language.
using System;
using System.IO;
public class Example
{
public static void Main()
{
string[] words = { "Tuesday", "Salı", "Вторник", "Mardi",
"Τρίτη", "Martes", "יום שלישי",
"الثلاثاء", "วันอังคาร" };
StreamWriter sw = new StreamWriter(@".\output.txt");
// Display array in unsorted order.
foreach (string word in words)
sw.WriteLine(word);
sw.WriteLine();
// Create parallel array of words by calling ToUpperInvariant.
string[] upperWords = new string[words.Length];
for (int ctr = words.GetLowerBound(0); ctr <= words.GetUpperBound(0); ctr++)
upperWords[ctr] = words[ctr].ToUpperInvariant();
// Sort the words array based on the order of upperWords.
Array.Sort(upperWords, words, StringComparer.InvariantCulture);
// Display the sorted array.
foreach (string word in words)
sw.WriteLine(word);
sw.Close();
}
}
// The example produces the following output:
// Tuesday
// Salı
// Вторник
// Mardi
// Τρίτη
// Martes
// יום שלישי
// الثلاثاء
// วันอังคาร
//
// Mardi
// Martes
// Salı
// Tuesday
// Τρίτη
// Вторник
// יום שלישי
// الثلاثاء
// วันอังคาร
Imports System.IO
Module Example
Public Sub Main()
Dim words() As String = { "Tuesday", "Salı", "Вторник", "Mardi", _
"Τρίτη", "Martes", "יום שלישי", _
"الثلاثاء", "วันอังคาร" }
Dim sw As New StreamWriter(".\output.txt")
' Display array in unsorted order.
For Each word As String In words
sw.WriteLine(word)
Next
sw.WriteLine()
' Create parallel array of words by calling ToUpperInvariant.
Dim upperWords(words.Length - 1) As String
For ctr As Integer = words.GetLowerBound(0) To words.GetUpperBound(0)
upperWords(ctr) = words(ctr).ToUpperInvariant()
Next
' Sort the words array based on the order of upperWords.
Array.Sort(upperWords, words, StringComparer.InvariantCulture)
' Display the sorted array.
For Each word As String In words
sw.WriteLine(word)
Next
sw.Close()
End Sub
End Module
' The example produces the following output:
' Tuesday
' Salı
' Вторник
' Mardi
' Τρίτη
' Martes
' יום שלישי
' الثلاثاء
' วันอังคาร
'
' Mardi
' Martes
' Salı
' Tuesday
' Τρίτη
' Вторник
' יום שלישי
' الثلاثاء
' วันอังคาร
Remarks
The invariant culture represents a culture that is culture-insensitive. It is associated with the English language but not with a specific country or region. For more information, see the CultureInfo.InvariantCulture property.
If your application depends on the case of a string changing in a predictable way that is unaffected by the current culture, use the ToUpperInvariant method. The ToUpperInvariant method is equivalent to ToUpper(CultureInfo.InvariantCulture)
. The method is recommended when a collection of strings must appear in a predictable order in a user interface control.
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 uppercase.
Security Considerations
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 methods.
Applies to
See also
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