TextInfo.ToTitleCase(String) メソッド

定義

指定した文字列を (頭字語と見なされる、すべてが大文字で記載された単語を除き)、英語見出しと同じ大文字/小文字の組み合わせに変換します。Converts the specified string to title case (except for words that are entirely in uppercase, which are considered to be acronyms).

public:
 System::String ^ ToTitleCase(System::String ^ str);
public string ToTitleCase (string str);
member this.ToTitleCase : string -> string
Public Function ToTitleCase (str As String) As String

パラメーター

str
String

単語の先頭文字を大文字に変換する文字列。The string to convert to title case.

戻り値

指定した文字列内の単語の先頭文字が大文字に変換された文字列。The specified string converted to title case.

例外

strnull です。str is null.

次の例では、英語 (米国) カルチャに基づいて文字列の大文字と小文字の指定を変更します。カルチャ名は en-us です。The following example changes the casing of a string based on the English (United States) culture, with the culture name en-US.

using namespace System;
using namespace System::Globalization;
int main()
{
   
   // Defines the String* with mixed casing.
   String^ myString = "wAr aNd pEaCe";
   
   // Creates a TextInfo based on the S"en-US" culture.
   CultureInfo^ MyCI = gcnew CultureInfo( "en-US",false );
   TextInfo^ myTI = MyCI->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.

S"wAr aNd pEaCe" to lowercase: war and peace
S"wAr aNd pEaCe" to uppercase: WAR AND PEACE
S"wAr aNd pEaCe" to titlecase: War And Peace

*/
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

*/
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

End Class


'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


次の例は、配列内の各文字列を ToTitleCase メソッドに渡します。The following example passes each string in an array to the ToTitleCase method. 文字列には、適切なタイトルの文字列と頭字語が含まれています。The strings include proper title strings as well as acronyms. 文字列は、en-us カルチャの規則を使用して、タイトルケースに変換されます。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
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim values() As String = { "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"}
                                 
      Dim ti As TextInfo = CultureInfo.CurrentCulture.TextInfo
      For Each value In values
         Console.WriteLine("{0} --> {1}", value, ti.ToTitleCase(value))
      Next
   End Sub
End Module
' 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

注釈

通常、タイトルの大文字と小文字は、単語の最初の文字を大文字に、残りの文字を小文字に変換します。Generally, title casing converts the first character of a word to uppercase and the rest of the characters to lowercase. ただし、このメソッドは、頭字語など、完全に大文字の単語を変換するための適切な大文字小文字の区別を現在提供していません。However, this method does not currently provide proper casing to convert a word that is entirely uppercase, such as an acronym. 次の表は、メソッドがいくつかの文字列を表示する方法を示しています。The following table shows the way the method renders several strings.

入力Input 言語Language 期待される結果Expected result 実際の結果Actual result
戦争と平和war and peace 英語English 戦争と平和War and Peace 戦争と平和War And Peace
Anhalter durch さいころ Galaxis あたりPer anhalter durch die Galaxis ドイツ語German Anhalter durch さいころ Galaxis あたりPer Anhalter durch die Galaxis Anhalter Durch さいころ Galaxis あたりPer Anhalter Durch Die Galaxis
naufragés d'ythaqles naufragés d'ythaq フランス語French Naufragés d'YthaqLes Naufragés d'Ythaq Naufragés D'ythaqLes Naufragés D'ythaq

上の図に示すToTitleCaseように、メソッドは任意の大文字小文字の動作を提供しますが、これは必ずしも言語が正しいとは限りません。As illustrated above, the ToTitleCase method provides an arbitrary casing behavior which is not necessarily linguistically correct. 言語が適切なソリューションでは、追加のルールが必要であり、現在のアルゴリズムはやや単純で高速です。A linguistically correct solution would require additional rules, and the current algorithm is somewhat simpler and faster. 今後、この API の速度を低下させる権利を留保しています。We reserve the right to make this API slower in the future.

ToTitleCaseメソッドの現在の実装では、入力文字列と同じ長さの出力文字列が生成されます。The current implementation of the ToTitleCase method yields an output string that is the same length as the input string. ただし、この動作は保証されず、将来の実装で変更される可能性があります。However, this behavior is not guaranteed and could change in a future implementation.

適用対象

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