String.ToLower メソッド
小文字で構成される String のコピーを返します。
オーバーロードの一覧
現在のカルチャの大文字と小文字の規則を使用して、この String のコピーを小文字で返します。
.NET Compact Framework でもサポート。
[Visual Basic] Overloads Public Function ToLower() As String
[JScript] public function ToLower() : String;
指定したカルチャの大文字と小文字の規則を使用して、この String のコピーを小文字で返します。
.NET Compact Framework でもサポート。
[Visual Basic] Overloads Public Function ToLower(CultureInfo) As String
使用例
[Visual Basic, C#, C++] メモ ここでは、ToLower のオーバーロード形式のうちの 1 つだけについて、使用例を示します。その他の例については、各オーバーロード形式のトピックを参照してください。
' Sample for String.ToLower(CultureInfo)
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic
Class Sample
Public Shared Sub Main()
Dim str1 As [String] = "INDIGO"
' str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
Dim str2 As New [String](New [Char]() {ChrW(&H0130), "N"c, "D"c, ChrW(&H0130), "G"c, "O"c})
Dim str3, str4 As [String]
Console.WriteLine()
Console.WriteLine("str1 = '{0}'", str1)
Console.WriteLine()
Console.WriteLine("str1 is {0} to str2.", _
IIf(0 = [String].CompareOrdinal(str1, str2), "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(New 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(New CultureInfo("tr-TR", False))
' Compare the code points in str3 and str4.
Console.WriteLine()
Console.WriteLine("str3 is {0} to str4.", _
IIf(0 = [String].CompareOrdinal(str3, str4), "equal", "not equal"))
CodePoints("str3", str3)
CodePoints("str4", str4)
End Sub 'Main
Public Shared Sub CodePoints(title As [String], s As [String])
Console.Write("{0}The code points in {1} are: {0}", Environment.NewLine, title)
Dim c As Char
For Each c In s
Console.Write("{0:x4} ", AscW(c))
Next c
Console.WriteLine()
End Sub 'CodePoints
End Class 'Sample
'
'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
[C#]
// Sample for String.ToLower(CultureInfo)
using System;
using System.Globalization;
class Sample
{
public static void Main()
{
String str1 = "INDIGO";
// str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
String str2 = new String(new Char[] {'\u0130', 'N', 'D', '\u0130', 'G', 'O'});
String str3, str4;
Console.WriteLine();
Console.WriteLine("str1 = '{0}'", str1);
Console.WriteLine();
Console.WriteLine("str1 is {0} to str2.",
((0 == String.CompareOrdinal(str1, str2)) ? "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(new 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(new 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)) ? "equal" : "not equal"));
CodePoints("str3", str3);
CodePoints("str4", str4);
}
public static void CodePoints(String title, String s)
{
Console.Write("{0}The code points in {1} are: {0}", Environment.NewLine, title);
foreach (ushort u in s)
Console.Write("{0:x4} ", u);
Console.WriteLine();
}
}
/*
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
*/
[C++]
// Sample for String::ToLower(CultureInfo)
#using <mscorlib.dll>
using namespace System;
using namespace System::Globalization;
void CodePoints(String* title, String* s) {
Console::Write(S"{0}The code points in {1} are: {0}", Environment::NewLine, title);
System::Collections::IEnumerator* myEnum = s->GetEnumerator();
while (myEnum->MoveNext()) {
UInt16 u = *__try_cast<Char*>(myEnum->Current);
Console::Write(S"{0:x4} ", __box(u));
}
Console::WriteLine();
}
int main() {
String* str1 = S"INDIGO";
// str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
Char temp[] = {L'\u0130', L'N', L'D', L'\u0130', L'G', L'O'};
String* str2 = new String(temp);
String* str3, *str4;
Console::WriteLine();
Console::WriteLine(S"str1 = '{0}'", str1);
Console::WriteLine();
Console::WriteLine(S"str1 is {0} to str2.",
((0 == String::CompareOrdinal(str1, str2)) ? S"equal" : S"not equal"));
CodePoints(S"str1", str1);
CodePoints(S"str2", str2);
Console::WriteLine();
// str3 is a lower case copy of str2, using English-United States culture.
Console::WriteLine(S"str3 = Lower case copy of str2 using English-United States culture.");
str3 = str2->ToLower(new CultureInfo(S"en-US", false));
// str4 is a lower case copy of str2, using Turkish-Turkey culture.
Console::WriteLine(S"str4 = Lower case copy of str2 using Turkish-Turkey culture.");
str4 = str2->ToLower(new CultureInfo(S"tr-TR", false));
// Compare the code points in str3 and str4.
Console::WriteLine();
Console::WriteLine(S"str3 is {0} to str4.",
((0 == String::CompareOrdinal(str3, str4)) ? S"equal" : S"not equal"));
CodePoints(S"str3", str3);
CodePoints(S"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
*/
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