此下的程序为什么不对：

[leeyufeng1981]

此下的程序为什么不对：
CString strTest("日文汉字！");
strTest.MakeLower();
为什么不能转换成小写的阿

[youlongzaitian]

' 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 an 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 of 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

[somedummy]

大小写应该对于E文字符才有用，makelower并不是简单的减掉0x20，而是挑选E文字符而且要根据ASCII和unicode的不同分别进行处理的

CString有对应的unicode版本和ASCII版本

[somedummy]

另外好像还有MBCS的版本

[北京的雾霾天]

CString strTest("日文汉字！");
strTest= strTest.MakeLower();

[leeyufeng1981]

strTest= strTest.MakeLower();
是错误写法。

我想问问什么全角不能转换大小写啊