CompareInfo 类
实现一组方法进行区分区域性的字符串比较。
**命名空间:**System.Globalization
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class CompareInfo
Implements IDeserializationCallback
用法
Dim instance As CompareInfo
[SerializableAttribute]
[ComVisibleAttribute(true)]
public class CompareInfo : IDeserializationCallback
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class CompareInfo : IDeserializationCallback
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public class CompareInfo implements IDeserializationCallback
SerializableAttribute
ComVisibleAttribute(true)
public class CompareInfo implements IDeserializationCallback
备注
CultureInfo 类包括一个 CompareInfo 属性，它是此类的实例。String.Compare 使用 CultureInfo.CompareInfo 中的信息来比较字符串。
与多数类不同，CompareInfo 提供 GetCompareInfo 方法（而不是公共构造函数）来允许进行后期绑定访问。
若要为任何区域性创建 CompareInfo，请使用 CultureInfo.CompareInfo 属性，或使用 GetCompareInfo 方法。
忽略的搜索值
如果忽略搜索值，比较操作（例如 IndexOf 或 LastIndexOf 方法）会产生意外的结果。当搜索值是空字符串 ("")，或者是由于比较选项或因码位没有语义而不在操作中被考虑的字符或由这类字符组成的字符串时，将忽略搜索值。例如，如果 IndexOf 方法的搜索值是空字符串，则返回值是零。
安全注意事项
如果安全决策取决于字符串比较或大小写更改操作，则使用 InvariantCulture 确保无论如何设置系统的区域性，行为都将保持一致。
示例
下面的代码示例显示与 CultureInfo 对象关联的 CompareInfo 对象如何影响字符串比较。
Imports System
Imports System.Text
Imports System.Globalization
NotInheritable Public Class App
Shared Sub Main(ByVal args() As String)
Dim sign() As String = {"<", "=", ">"}
' The code below demonstrates how strings compare
' differently for different cultures.
Dim s1 As String = "Coté"
Dim s2 As String = "coté"
Dim s3 As String = "côte"
' Set sort order of strings for French in France.
Dim ci As CompareInfo = New CultureInfo("fr-FR").CompareInfo
Console.WriteLine("The LCID for {0} is {1}.", ci.Name, ci.LCID)
' Display the result using fr-FR Compare of Coté = coté.
Console.WriteLine("fr-FR Compare: {0} {2} {1}", _
s1, s2, sign((ci.Compare(s1, s2, CompareOptions.IgnoreCase) + 1)))
' Display the result using fr-FR Compare of coté > côte.
Console.WriteLine("fr-FR Compare: {0} {2} {1}", _
s2, s3, sign((ci.Compare(s2, s3, CompareOptions.None) + 1)))
' Set sort order of strings for Japanese as spoken in Japan.
ci = New CultureInfo("ja-JP").CompareInfo
Console.WriteLine("The LCID for {0} is {1}.", ci.Name, ci.LCID)
' Display the result using ja-JP Compare of coté < côte.
Console.WriteLine("ja-JP Compare: {0} {2} {1}", _
s2, s3, sign((ci.Compare(s2, s3) + 1)))
End Sub 'Main
End Class 'App
' This code produces the following output.
'
' The LCID for fr-FR is 1036.
' fr-FR Compare: Coté = coté
' fr-FR Compare: coté > côte
' The LCID for ja-JP is 1041.
' ja-JP Compare: coté < côte
using System;
using System.Text;
using System.Globalization;
public sealed class App
{
static void Main(string[] args)
{
String[] sign = new String[] { "<", "=", ">" };
// The code below demonstrates how strings compare
// differently for different cultures.
String s1 = "Coté", s2 = "coté", s3 = "côte";
// Set sort order of strings for French in France.
CompareInfo ci = new CultureInfo("fr-FR").CompareInfo;
Console.WriteLine("The LCID for {0} is {1}.", ci.Name, ci.LCID);
// Display the result using fr-FR Compare of Coté = coté.
Console.WriteLine("fr-FR Compare: {0} {2} {1}",
s1, s2, sign[ci.Compare(s1, s2, CompareOptions.IgnoreCase) + 1]);
// Display the result using fr-FR Compare of coté > côte.
Console.WriteLine("fr-FR Compare: {0} {2} {1}",
s2, s3, sign[ci.Compare(s2, s3, CompareOptions.None) + 1]);
// Set sort order of strings for Japanese as spoken in Japan.
ci = new CultureInfo("ja-JP").CompareInfo;
Console.WriteLine("The LCID for {0} is {1}.", ci.Name, ci.LCID);
// Display the result using ja-JP Compare of coté < côte.
Console.WriteLine("ja-JP Compare: {0} {2} {1}",
s2, s3, sign[ci.Compare(s2, s3) + 1]);
}
}
// This code produces the following output.
//
// The LCID for fr-FR is 1036.
// fr-FR Compare: Coté = coté
// fr-FR Compare: coté > côte
// The LCID for ja-JP is 1041.
// ja-JP Compare: coté < côte
using namespace System;
using namespace System::Text;
using namespace System::Globalization;
int main()
{
array<String^>^ sign = gcnew array<String^> { "<", "=", ">" };
// The code below demonstrates how strings compare
// differently for different cultures.
String^ s1 = "Coté";
String^ s2 = "coté";
String^ s3 = "côte";
// Set sort order of strings for French in France.
CompareInfo^ ci = (gcnew CultureInfo("fr-FR"))->CompareInfo;
Console::WriteLine(L"The LCID for {0} is {1}.", ci->Name, ci->LCID);
// Display the result using fr-FR Compare of Coté = coté.
Console::WriteLine(L"fr-FR Compare: {0} {2} {1}",
s1, s2, sign[ci->Compare(s1, s2, CompareOptions::IgnoreCase) + 1]);
// Display the result using fr-FR Compare of coté > côte.
Console::WriteLine(L"fr-FR Compare: {0} {2} {1}",
s2, s3, sign[ci->Compare(s2, s3, CompareOptions::None) + 1]);
// Set sort order of strings for Japanese as spoken in Japan.
ci = (gcnew CultureInfo("ja-JP"))->CompareInfo;
Console::WriteLine(L"The LCID for {0} is {1}.", ci->Name, ci->LCID);
// Display the result using ja-JP Compare of coté < côte.
Console::WriteLine("ja-JP Compare: {0} {2} {1}",
s2, s3, sign[ci->Compare(s2, s3) + 1]);
}
// This code produces the following output.
//
// The LCID for fr-FR is 1036.
// fr-FR Compare: Coté = coté
// fr-FR Compare: coté > côte
// The LCID for ja-JP is 1041.
// ja-JP Compare: coté < côte
继承层次结构
System.Object
System.Globalization.CompareInfo
线程安全
此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0