String.Compare String.Compare String.Compare String.Compare Method

定义

比较两个指定的 String 对象,并返回一个指示二者在排序顺序中的相对位置的整数。Compares two specified String objects and returns an integer that indicates their relative position in the sort order.

重载

Compare(String, Int32, String, Int32, Int32, Boolean) Compare(String, Int32, String, Int32, Int32, Boolean) Compare(String, Int32, String, Int32, Int32, Boolean) Compare(String, Int32, String, Int32, Int32, Boolean)

比较两个指定的 String 对象的子字符串(忽略或考虑其大小写),并返回一个整数,指示二者在排序顺序中的相对位置。Compares substrings of two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)

比较两个指定的 String 对象(其中忽略或考虑其大小写,并使用区域性特定的信息干预比较),并返回一个整数,指示二者在排序顺序中的相对位置。Compares substrings of two specified String objects, ignoring or honoring their case and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

Compare(String, Int32, String, Int32, Int32, StringComparison) Compare(String, Int32, String, Int32, Int32, StringComparison) Compare(String, Int32, String, Int32, Int32, StringComparison) Compare(String, Int32, String, Int32, Int32, StringComparison)

使用指定的规则比较两个指定的 String 对象的子字符串,并返回一个整数,指示二者在排序顺序中的相对位置。Compares substrings of two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order.

Compare(String, Int32, String, Int32, Int32) Compare(String, Int32, String, Int32, Int32) Compare(String, Int32, String, Int32, Int32) Compare(String, Int32, String, Int32, Int32)

比较两个指定的 String 对象的子字符串,并返回一个指示二者在排序顺序中的相对位置的整数。Compares substrings of two specified String objects and returns an integer that indicates their relative position in the sort order.

Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)

对两个指定 String 对象的子字符串进行比较,使用指定的比较选项和区域性特定的信息来影响比较,并返回一个整数,该整数指示这两个子字符串在排序顺序中的关系。Compares substrings of two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two substrings to each other in the sort order.

Compare(String, String, Boolean, CultureInfo) Compare(String, String, Boolean, CultureInfo) Compare(String, String, Boolean, CultureInfo) Compare(String, String, Boolean, CultureInfo)

比较两个指定的 String 对象(其中忽略或考虑其大小写,并使用区域性特定的信息干预比较),并返回一个整数,指示二者在排序顺序中的相对位置。Compares two specified String objects, ignoring or honoring their case, and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

Compare(String, String, StringComparison) Compare(String, String, StringComparison) Compare(String, String, StringComparison) Compare(String, String, StringComparison)

使用指定的规则比较两个指定的 String 对象,并返回一个整数,指示二者在排序顺序中的相对位置。Compares two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order.

Compare(String, String, Boolean) Compare(String, String, Boolean) Compare(String, String, Boolean) Compare(String, String, Boolean)

比较两个指定的 String 对象(其中忽略或考虑其大小写),并返回一个整数,指示二者在排序顺序中的相对位置。Compares two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

Compare(String, String) Compare(String, String) Compare(String, String) Compare(String, String)

比较两个指定的 String 对象,并返回一个指示二者在排序顺序中的相对位置的整数。Compares two specified String objects and returns an integer that indicates their relative position in the sort order.

Compare(String, String, CultureInfo, CompareOptions) Compare(String, String, CultureInfo, CompareOptions) Compare(String, String, CultureInfo, CompareOptions) Compare(String, String, CultureInfo, CompareOptions)

对两个指定的 String 对象进行比较,使用指定的比较选项和区域性特定的信息来影响比较,并返回一个整数,该整数指示这两个字符串在排序顺序中的关系。Compares two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two strings to each other in the sort order.

注解

Compare 方法的所有重载返回一个 32 位有符号整数,指示两个比较数之间的词法关系。All overloads of the Compare method return a 32-bit signed integer indicating the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero 第一个子字符串在排序顺序中位于第二个的子字符串。The first substring precedes the second substring in the sort order.
Zero 子字符串在排序顺序中出现的位置相同或 length 为零。The substrings occur in the same position in the sort order, or length is zero.
大于零Greater than zero 第一个子字符串在排序顺序中的第二个子字符串之后。The first substring follows the second substring in the sort order.

警告

只要有可能,应调用的重载Compare方法,包括StringComparison参数。Whenever possible, you should call an overload of the Compare method that includes a StringComparison parameter. 有关详细信息,请参阅有关使用字符串的最佳实践For more information, see Best Practices for Using Strings.

Compare(String, Int32, String, Int32, Int32, Boolean) Compare(String, Int32, String, Int32, Int32, Boolean) Compare(String, Int32, String, Int32, Int32, Boolean) Compare(String, Int32, String, Int32, Int32, Boolean)

比较两个指定的 String 对象的子字符串(忽略或考虑其大小写),并返回一个整数,指示二者在排序顺序中的相对位置。Compares substrings of two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, bool ignoreCase);
public static int Compare (string strA, int indexA, string strB, int indexB, int length, bool ignoreCase);
static member Compare : string * int * string * int * int * bool -> int
Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, ignoreCase As Boolean) As Integer

参数

strA
String String String String

要在比较中使用的第一个字符串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

strA 中子字符串的位置。The position of the substring within strA.

strB
String String String String

要在比较中使用的第二个字符串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

strB 中子字符串的位置。The position of the substring within strB.

length
Int32 Int32 Int32 Int32

要比较的子字符串中字符的最大数量。The maximum number of characters in the substrings to compare.

ignoreCase
Boolean Boolean Boolean Boolean

若要在比较过程中忽略大小写,则为 true;否则为 falsetrue to ignore case during the comparison; otherwise, false.

返回

一个 32 位带符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字符串在排序顺序中出现的位置相同或 length 为零。The substrings occur in the same position in the sort order, or length is zero.
大于零Greater than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之后。The substring in strA follows the substring in strB in the sort order.

异常

indexA 大于 strA.LengthindexA is greater than strA.Length.

- 或 --or- indexB 大于 strB.LengthindexB is greater than strB.Length.

-or- indexAindexBlength 为负数。indexA, indexB, or length is negative.

- 或 --or- indexAindexBnull,并且 length 大于零。Either indexA or indexB is null, and length is greater than zero.

示例

下面的示例执行两个只不同的子字符串的两个的比较操作中用例。The following example performs two comparisons of two substrings that only differ in case. 第一次比较不区分大小写和第二个比较考虑大小写。The first comparison ignores case and the second comparison considers case.

// Sample for String::Compare(String, Int32, String, Int32, Int32, Boolean)
using namespace System;
int main()
{
   
   //                0123456
   String^ str1 = "MACHINE";
   String^ str2 = "machine";
   String^ str;
   int result;
   Console::WriteLine();
   Console::WriteLine( "str1 = '{0}', str2 = '{1}'", str1, str2 );
   Console::WriteLine( "Ignore case:" );
   result = String::Compare( str1, 2, str2, 2, 2, true );
   str = ((result < 0) ? "less than" : ((result > 0) ? (String^)"greater than" : "equal to"));
   Console::Write( "Substring '{0}' in '{1}' is ", str1->Substring( 2, 2 ), str1 );
   Console::Write( " {0} ", str );
   Console::WriteLine( "substring '{0}' in '{1}'.", str2->Substring( 2, 2 ), str2 );
   Console::WriteLine();
   Console::WriteLine( "Honor case:" );
   result = String::Compare( str1, 2, str2, 2, 2, false );
   str = ((result < 0) ? "less than" : ((result > 0) ? (String^)"greater than" : "equal to"));
   Console::Write( "Substring '{0}' in '{1}' is ", str1->Substring( 2, 2 ), str1 );
   Console::Write( " {0} ", str );
   Console::WriteLine( "substring '{0}' in '{1}'.", str2->Substring( 2, 2 ), str2 );
}

/*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case:
Substring 'CH' in 'MACHINE' is equal to substring 'ch' in 'machine'.

Honor case:
Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
*/
// Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean)
using System;

class Sample {
    public static void Main() {
//                 0123456
    String str1 = "MACHINE";
    String str2 = "machine";
    String str;
    int result;

    Console.WriteLine();
    Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
    Console.WriteLine("Ignore case:");
    result = String.Compare(str1, 2, str2, 2, 2, true);
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
    Console.Write("{0} ", str);
    Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2);

    Console.WriteLine();
    Console.WriteLine("Honor case:");
    result = String.Compare(str1, 2, str2, 2, 2, false);
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
    Console.Write("{0} ", str);
    Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2);
    }
}
/*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case:
Substring 'CH' in 'MACHINE' is equal to substring 'ch' in 'machine'.

Honor case:
Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
*/
' Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean)
Imports System
Imports Microsoft.VisualBasic

Class Sample
   
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "MACHINE"
      Dim str2 As [String] = "machine"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      Console.WriteLine("Ignore case:")
      result = [String].Compare(str1, 2, str2, 2, 2, True)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2)
      
      Console.WriteLine()
      Console.WriteLine("Honor case:")
      result = [String].Compare(str1, 2, str2, 2, 2, False)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2)
   End Sub 'Main
End Class 'Sample
'
'This example produces the following results:
'
'str1 = 'MACHINE', str2 = 'machine'
'Ignore case:
'Substring 'CH' in 'MACHINE' is equal to substring 'ch' in 'machine'.
'
'Honor case:
'Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
'

注解

要比较的子字符串在启动strAindexA,然后在strBindexBThe substrings to compare start in strA at indexA, and in strB at indexB. 这两indexAindexB是从零开始; 即中的第一个字符strAstrB位置为零。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero. 第一个子字符串的长度等于的长度strA减去indexA加一。The length of the first substring is equal to the length of strA minus indexA plus one. 第二个的子字符串的长度等于的长度strB减去indexB加一。The length of the second substring is equal to the length of strB minus indexB plus one.

要比较的字符数是较小的两个子字符串的长度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length参数必须为非负。The indexA, indexB, and length parameters must be nonnegative.

比较使用当前区域性来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字符的组合被视为单个字符或大写和小写字符进行比较以特定方式,可以指定区域性或字符的排序顺序取决于前的字符,或在其后。For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

使用单词排序规则执行比较。The comparison is performed using word sort rules. 有关 word、 字符串和顺序排序的详细信息,请参阅System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

比较字符串时,应调用Compare(String, Int32, String, Int32, Int32, StringComparison)方法,要求您显式指定该方法使用的字符串比较的类型。When comparing strings, you should call the Compare(String, Int32, String, Int32, Int32, StringComparison) method, which requires that you explicitly specify the type of string comparison that the method uses. 有关详细信息,请参阅有关使用字符串的最佳实践For more information, see Best Practices for Using Strings.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了这两个子字符串。The comparison terminates when an inequality is discovered or both substrings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,然后其余的字符的字符串被视为更高版本。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

路径名称必须以固定的方式进行比较。The path name needs to be compared in an invariant manner. 若要执行此操作的正确代码如下所示。The correct code to do this is as follows.

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, Boolean)方法执行语言性的或区分区域性的比较时不考虑这些字符。The Compare(String, Int32, String, Int32, Int32, Boolean) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要识别您的比较中的可忽略字符,调用Compare(String, Int32, String, Int32, Int32, StringComparison)方法并提供的值OrdinalOrdinalIgnoreCasecomparisonType参数。To recognize ignorable characters in your comparison, call the Compare(String, Int32, String, Int32, Int32, StringComparison) method and supply a value of Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另请参阅

Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)

比较两个指定的 String 对象(其中忽略或考虑其大小写,并使用区域性特定的信息干预比较),并返回一个整数,指示二者在排序顺序中的相对位置。Compares substrings of two specified String objects, ignoring or honoring their case and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, bool ignoreCase, System::Globalization::CultureInfo ^ culture);
public static int Compare (string strA, int indexA, string strB, int indexB, int length, bool ignoreCase, System.Globalization.CultureInfo culture);
static member Compare : string * int * string * int * int * bool * System.Globalization.CultureInfo -> int
Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, ignoreCase As Boolean, culture As CultureInfo) As Integer

参数

strA
String String String String

要在比较中使用的第一个字符串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

strA 中子字符串的位置。The position of the substring within strA.

strB
String String String String

要在比较中使用的第二个字符串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

strB 中子字符串的位置。The position of the substring within strB.

length
Int32 Int32 Int32 Int32

要比较的子字符串中字符的最大数量。The maximum number of characters in the substrings to compare.

ignoreCase
Boolean Boolean Boolean Boolean

若要在比较过程中忽略大小写,则为 true;否则为 falsetrue to ignore case during the comparison; otherwise, false.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

一个对象,提供区域性特定的比较信息。An object that supplies culture-specific comparison information.

返回

一个整数,指示两个比较字之间的词法关系。An integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字符串在排序顺序中出现的位置相同或 length 为零。The substrings occur in the same position in the sort order, or length is zero.
大于零Greater than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之后。The substring in strA follows the substring in strB in the sort order.

异常

indexA 大于 strA.LengthindexA is greater than strA.Length.

-or- indexB 大于 strB.LengthindexB is greater than strB.Length.

- 或 --or- indexAindexBlength 为负数。indexA, indexB, or length is negative.

-or- strAstrBnull,并且 length 大于零。Either strA or strB is null, and length is greater than zero.

示例

下面的示例比较这两个子字符串使用不同的区域性并忽略子字符串的大小写。The following example compares two substrings using different cultures and ignoring the case of the substrings. 区域性的选择会影响字母"I"的方式进行比较。The choice of culture affects how the letter "I" is compared.

// Sample for String::Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
using namespace System;
using namespace System::Globalization;
int main()
{
   
   //                0123456
   String^ str1 = "MACHINE";
   String^ str2 = "machine";
   String^ str;
   int result;
   Console::WriteLine();
   Console::WriteLine( "str1 = '{0}', str2 = '{1}'", str1, str2 );
   Console::WriteLine( "Ignore case, Turkish culture:" );
   result = String::Compare( str1, 4, str2, 4, 2, true, gcnew CultureInfo( "tr-TR" ) );
   str = ((result < 0) ? "less than" : ((result > 0) ? (String^)"greater than" : "equal to"));
   Console::Write( "Substring '{0}' in '{1}' is ", str1->Substring( 4, 2 ), str1 );
   Console::Write( " {0} ", str );
   Console::WriteLine( "substring '{0}' in '{1}'.", str2->Substring( 4, 2 ), str2 );
   Console::WriteLine();
   Console::WriteLine( "Ignore case, invariant culture:" );
   result = String::Compare( str1, 4, str2, 4, 2, true, CultureInfo::InvariantCulture );
   str = ((result < 0) ? "less than" : ((result > 0) ? (String^)"greater than" : "equal to"));
   Console::Write( "Substring '{0}' in '{1}' is ", str1->Substring( 4, 2 ), str1 );
   Console::Write( " {0} ", str );
   Console::WriteLine( "substring '{0}' in '{1}'.", str2->Substring( 4, 2 ), str2 );
}

/*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case, Turkish culture:
Substring 'IN' in 'MACHINE' is less than substring 'in' in 'machine'.

Ignore case, invariant culture:
Substring 'IN' in 'MACHINE' is equal to substring 'in' in 'machine'.
*/
// Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
using System;
using System.Globalization;

class Sample {
    public static void Main() {
//                 0123456
    String str1 = "MACHINE";
    String str2 = "machine";
    String str;
    int result;

    Console.WriteLine();
    Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
    Console.WriteLine("Ignore case, Turkish culture:");
    result = String.Compare(str1, 4, str2, 4, 2, true, new CultureInfo("tr-TR"));
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1);
    Console.Write("{0} ", str);
    Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2);

    Console.WriteLine();
    Console.WriteLine("Ignore case, invariant culture:");
    result = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo.InvariantCulture);
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1);
    Console.Write("{0} ", str);
    Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2);
    }
}
/*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case, Turkish culture:
Substring 'IN' in 'MACHINE' is less than substring 'in' in 'machine'.

Ignore case, invariant culture:
Substring 'IN' in 'MACHINE' is equal to substring 'in' in 'machine'.
*/
' Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Class Sample
   
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "MACHINE"
      Dim str2 As [String] = "machine"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      Console.WriteLine("Ignore case, Turkish culture:")
      result = [String].Compare(str1, 4, str2, 4, 2, True, New CultureInfo("tr-TR"))
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2)
      
      Console.WriteLine()
      Console.WriteLine("Ignore case, invariant culture:")
      result = [String].Compare(str1, 4, str2, 4, 2, True, CultureInfo.InvariantCulture)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2)
   End Sub 'Main
End Class 'Sample
'
'This example produces the following results:
'
'str1 = 'MACHINE', str2 = 'machine'
'Ignore case, Turkish culture:
'Substring 'IN' in 'MACHINE' is less than substring 'in' in 'machine'.
'
'Ignore case, invariant culture:
'Substring 'IN' in 'MACHINE' is equal to substring 'in' in 'machine'.
'

注解

要比较的子字符串在启动strAindexA,然后在strBindexBThe substrings to compare start in strA at indexA, and in strB at indexB. 这两indexAindexB是从零开始; 即中的第一个字符strAstrB是在位置零,定位一个。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero, not position one. 第一个子字符串的长度等于的长度strA减去indexA加一。The length of the first substring is equal to the length of strA minus indexA plus one. 第二个的子字符串的长度等于的长度strB减去indexB加一。The length of the second substring is equal to the length of strB minus indexB plus one.

要比较的字符数是较小的两个子字符串的长度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length参数必须为非负。The indexA, indexB, and length parameters must be nonnegative.

比较使用culture参数来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the culture parameter to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字符的组合被视为单个字符或大写和小写字符进行比较以特定方式,可以指定区域性或字符的排序顺序取决于前的字符,或在其后。For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

使用单词排序规则执行比较。The comparison is performed using word sort rules. 有关 word、 字符串和顺序排序的详细信息,请参阅System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了这两个子字符串。The comparison terminates when an inequality is discovered or both substrings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,然后其余的字符的字符串被视为更高版本。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)方法执行语言性的或区分区域性的比较时不考虑这些字符。The Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要识别您的比较中的可忽略字符,调用Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法并提供的值OrdinalOrdinalIgnoreCaseoptions参数。To recognize ignorable characters in your comparison, call the Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method and supply a value of Ordinal or OrdinalIgnoreCase for the options parameter.

另请参阅

Compare(String, Int32, String, Int32, Int32, StringComparison) Compare(String, Int32, String, Int32, Int32, StringComparison) Compare(String, Int32, String, Int32, Int32, StringComparison) Compare(String, Int32, String, Int32, Int32, StringComparison)

使用指定的规则比较两个指定的 String 对象的子字符串,并返回一个整数,指示二者在排序顺序中的相对位置。Compares substrings of two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, StringComparison comparisonType);
public static int Compare (string strA, int indexA, string strB, int indexB, int length, StringComparison comparisonType);
static member Compare : string * int * string * int * int * StringComparison -> int
Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, comparisonType As StringComparison) As Integer

参数

strA
String String String String

要在比较中使用的第一个字符串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

strA 中子字符串的位置。The position of the substring within strA.

strB
String String String String

要在比较中使用的第二个字符串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

strB 中子字符串的位置。The position of the substring within strB.

length
Int32 Int32 Int32 Int32

要比较的子字符串中字符的最大数量。The maximum number of characters in the substrings to compare.

comparisonType
StringComparison StringComparison StringComparison StringComparison

一个枚举值,用于指定比较中要使用的规则。One of the enumeration values that specifies the rules to use in the comparison.

返回

一个 32 位带符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字符串在排序顺序中出现的位置相同,或 length 参数为零。The substrings occur in the same position in the sort order, or the length parameter is zero.
大于零Greater than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之后。The substring in strA follows the substring in strB in the sort order.

异常

indexA 大于 strA.LengthindexA is greater than strA.Length.

- 或 --or- indexB 大于 strB.LengthindexB is greater than strB.Length.

-or- indexAindexBlength 为负数。indexA, indexB, or length is negative.

- 或 --or- indexAindexBnull,并且 length 大于零。Either indexA or indexB is null, and length is greater than zero.

示例

下面的示例比较这两个子字符串。The following example compares two substrings.

// Sample for String::Compare(String, Int32, String, Int32, Int32)
using namespace System;
int main()
{
   
   //                0123456
   String^ str1 = "machine";
   String^ str2 = "device";
   String^ str;
   int result;
   Console::WriteLine();
   Console::WriteLine( "str1 = '{0}', str2 = '{1}'", str1, str2 );
   result = String::Compare( str1, 2, str2, 0, 2 );
   str = ((result < 0) ? "less than" : ((result > 0) ? (String^)"greater than" : "equal to"));
   Console::Write( "Substring '{0}' in ' {1}' is ", str1->Substring( 2, 2 ), str1 );
   Console::Write( " {0} ", str );
   Console::WriteLine( "substring '{0}' in ' {1}'.", str2->Substring( 0, 2 ), str2 );
}

/*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*/
// Sample for String.Compare(String, Int32, String, Int32, Int32)
using System;

class Sample {
    public static void Main() {
//                 0123456
    String str1 = "machine";
    String str2 = "device";
    String str;
    int result;

    Console.WriteLine();
    Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
    result = String.Compare(str1, 2, str2, 0, 2);
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
    Console.Write("{0} ", str);
    Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2);
    }
}
/*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*/
' Sample for String.Compare(String, Int32, String, Int32, Int32)
Imports System
Imports Microsoft.VisualBasic

Class Sample
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "machine"
      Dim str2 As [String] = "device"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      result = [String].Compare(str1, 2, str2, 0, 2)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2)
   End Sub 'Main
End Class 'Sample
'
'This example produces the following results:
'
'str1 = 'machine', str2 = 'device'
'Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
'

注解

要比较的子字符串在启动strAindexA并在strBindexBThe substrings to compare start in strA at indexA and in strB at indexB. 这两indexAindexB是从零开始; 即中的第一个字符strAstrB是在位置零,定位一个。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero, not position one. 第一个子字符串的长度等于的长度strA减去indexA加一。The length of the first substring is equal to the length of strA minus indexA plus one. 第二个的子字符串的长度等于的长度strB减去indexB加一。The length of the second substring is equal to the length of strB minus indexB plus one.

要比较的字符数是较小的两个子字符串的长度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length参数必须为非负。The indexA, indexB, and length parameters must be nonnegative.

comparisonType参数指示是否比较应使用当前或固定区域性,接受或忽略大小写的比较数,或使用 word (区分区域性) 或序号 (不区分区域性的) 排序规则。The comparisonType parameter indicates whether the comparison should use the current or invariant culture, honor or ignore the case of the comparands, or use word (culture-sensitive) or ordinal (culture-insensitive) sort rules.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了这两个子字符串。The comparison terminates when an inequality is discovered or both substrings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,其余字符的字符串则认为较大。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, StringComparison)方法执行语言性的或区分区域性的比较时不考虑这些字符。The Compare(String, Int32, String, Int32, Int32, StringComparison) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要识别您的比较中的可忽略字符,提供的值OrdinalOrdinalIgnoreCasecomparisonType参数。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另请参阅

Compare(String, Int32, String, Int32, Int32) Compare(String, Int32, String, Int32, Int32) Compare(String, Int32, String, Int32, Int32) Compare(String, Int32, String, Int32, Int32)

比较两个指定的 String 对象的子字符串,并返回一个指示二者在排序顺序中的相对位置的整数。Compares substrings of two specified String objects and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length);
public static int Compare (string strA, int indexA, string strB, int indexB, int length);
static member Compare : string * int * string * int * int -> int
Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer) As Integer

参数

strA
String String String String

要在比较中使用的第一个字符串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

strA 中子字符串的位置。The position of the substring within strA.

strB
String String String String

要在比较中使用的第二个字符串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

strB 中子字符串的位置。The position of the substring within strB.

length
Int32 Int32 Int32 Int32

要比较的子字符串中字符的最大数量。The maximum number of characters in the substrings to compare.

返回

一个 32 位有符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer indicating the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字符串在排序顺序中出现的位置相同或 length 为零。The substrings occur in the same position in the sort order, or length is zero.
大于零Greater than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之后。The substring in strA follows the substring in strB in the sort order.

异常

indexA 大于 strA.LengthindexA is greater than strA.Length.

-or- indexB 大于 strB.LengthindexB is greater than strB.Length.

-or- indexAindexBlength 为负数。indexA, indexB, or length is negative.

- 或 --or- indexAindexBnull,并且 length 大于零。Either indexA or indexB is null, and length is greater than zero.

示例

下面的示例比较这两个子字符串。The following example compares two substrings.

// Sample for String::Compare(String, Int32, String, Int32, Int32)
using namespace System;
int main()
{
   
   //                0123456
   String^ str1 = "machine";
   String^ str2 = "device";
   String^ str;
   int result;
   Console::WriteLine();
   Console::WriteLine( "str1 = '{0}', str2 = '{1}'", str1, str2 );
   result = String::Compare( str1, 2, str2, 0, 2 );
   str = ((result < 0) ? "less than" : ((result > 0) ? (String^)"greater than" : "equal to"));
   Console::Write( "Substring '{0}' in ' {1}' is ", str1->Substring( 2, 2 ), str1 );
   Console::Write( " {0} ", str );
   Console::WriteLine( "substring '{0}' in ' {1}'.", str2->Substring( 0, 2 ), str2 );
}

/*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*/
// Sample for String.Compare(String, Int32, String, Int32, Int32)
using System;

class Sample {
    public static void Main() {
//                 0123456
    String str1 = "machine";
    String str2 = "device";
    String str;
    int result;

    Console.WriteLine();
    Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
    result = String.Compare(str1, 2, str2, 0, 2);
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
    Console.Write("{0} ", str);
    Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2);
    }
}
/*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*/
' Sample for String.Compare(String, Int32, String, Int32, Int32)
Imports System
Imports Microsoft.VisualBasic

Class Sample
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "machine"
      Dim str2 As [String] = "device"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      result = [String].Compare(str1, 2, str2, 0, 2)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2)
   End Sub 'Main
End Class 'Sample
'
'This example produces the following results:
'
'str1 = 'machine', str2 = 'device'
'Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
'

注解

要比较的子字符串在启动strAindexA并在strBindexBThe substrings to compare start in strA at indexA and in strB at indexB. 这两indexAindexB是从零开始; 即中的第一个字符strAstrB位置为零。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero. 第一个子字符串的长度等于的长度strA减去indexA加一。The length of the first substring is equal to the length of strA minus indexA plus one. 第二个的子字符串的长度等于的长度strB减去indexB加一。The length of the second substring is equal to the length of strB minus indexB plus one.

要比较的字符数是较小的两个子字符串的长度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length参数必须为非负。The indexA, indexB, and length parameters must be nonnegative.

比较使用当前区域性来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字符的组合被视为单个字符或大写和小写字符进行比较以特定方式,可以指定区域性或字符的排序顺序取决于前的字符,或在其后。For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

使用单词排序规则执行比较。The comparison is performed using word sort rules. 有关 word、 字符串和顺序排序的详细信息,请参阅System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

比较字符串时,应调用Compare(String, Int32, String, Int32, Int32, StringComparison)方法,要求您显式指定该方法使用的字符串比较的类型。When comparing strings, you should call the Compare(String, Int32, String, Int32, Int32, StringComparison) method, which requires that you explicitly specify the type of string comparison that the method uses. 有关详细信息,请参阅有关使用字符串的最佳实践For more information, see Best Practices for Using Strings.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了这两个子字符串。The comparison terminates when an inequality is discovered or both substrings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,然后其余的字符的字符串被视为更高版本。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32)方法执行语言性的或区分区域性的比较时不考虑这些字符。The Compare(String, Int32, String, Int32, Int32) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要识别您的比较中的可忽略字符,调用Compare(String, Int32, String, Int32, Int32, StringComparison)方法并提供的值OrdinalOrdinalIgnoreCasecomparisonType参数。To recognize ignorable characters in your comparison, call the Compare(String, Int32, String, Int32, Int32, StringComparison) method and supply a value of Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另请参阅

Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)

对两个指定 String 对象的子字符串进行比较,使用指定的比较选项和区域性特定的信息来影响比较,并返回一个整数,该整数指示这两个子字符串在排序顺序中的关系。Compares substrings of two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two substrings to each other in the sort order.

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, System::Globalization::CultureInfo ^ culture, System::Globalization::CompareOptions options);
public static int Compare (string strA, int indexA, string strB, int indexB, int length, System.Globalization.CultureInfo culture, System.Globalization.CompareOptions options);
static member Compare : string * int * string * int * int * System.Globalization.CultureInfo * System.Globalization.CompareOptions -> int
Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, culture As CultureInfo, options As CompareOptions) As Integer

参数

strA
String String String String

要在比较中使用的第一个字符串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

strA 中子字符串开始的位置。The starting position of the substring within strA.

strB
String String String String

要在比较中使用的第二个字符串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

strB 中子字符串开始的位置。The starting position of the substring within strB.

length
Int32 Int32 Int32 Int32

要比较的子字符串中字符的最大数量。The maximum number of characters in the substrings to compare.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

一个对象,提供区域性特定的比较信息。An object that supplies culture-specific comparison information.

options
CompareOptions CompareOptions CompareOptions CompareOptions

要在执行比较时使用的选项(如忽略大小写或符号)。Options to use when performing the comparison (such as ignoring case or symbols).

返回

一个整数,该整数用于指示两个子字符串之间的词法关系,如下表所示。An integer that indicates the lexical relationship between the two substrings, as shown in the following table.

Value 条件Condition
小于零Less than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字符串在排序顺序中出现的位置相同或 length 为零。The substrings occur in the same position in the sort order, or length is zero.
大于零Greater than zero strA 中的子字符串在排序顺序中位于 strB 中的子字符串之后。The substring in strA follows the substring in strB in the sort order.

异常

indexA 大于 strA.LengthindexA is greater than strA.Length.

-or- indexB 大于 strB.LengthindexB is greater than strB.Length.

-or- indexAindexBlength 为负数。indexA, indexB, or length is negative.

-or- strAstrBnull,并且 length 大于零。Either strA or strB is null, and length is greater than zero.

示例

下面的示例使用Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法来比较两名人员的姓氏。The following example uses the Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method to compare the last names of two people. 然后,列出它们按字母顺序。It then lists them in alphabetical order.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string name1 = "Jack Smith";
      string name2 = "John Doe";
      
      // Get position of space character.
      int index1 = name1.IndexOf(" ");
      index1 = index1 < 0 ? 0 : index1--;
      
      int index2 = name2.IndexOf(" ");
      index1 = index1 < 0 ? 0 : index1--;
      
      int length = Math.Max(name1.Length, name2.Length);
      
      Console.WriteLine("Sorted alphabetically by last name:");
      if (String.Compare(name1, index1, name2, index2, length, 
                         new CultureInfo("en-US"), CompareOptions.IgnoreCase) < 0)
         Console.WriteLine("{0}\n{1}", name1, name2); 
      else
         Console.WriteLine("{0}\n{1}", name2, name1); 
   }
}
// The example displays the following output:
//       Sorted alphabetically by last name:
//       John Doe
//       Jack Smith
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim name1 As String = "Jack Smith"
      Dim name2 = "John Doe"
      
      ' Get position of space character.
      Dim index1 As Integer = name1.IndexOf(" ")
      index1 = CInt(IIf(index1 < 0, 0, index1 - 1))
      
      Dim index2 As Integer = name2.IndexOf(" ")
      index1 = CInt(IIf(index1 < 0, 0, index1 - 1))
      
      Dim length As Integer = Math.Max(name1.Length, name2.Length)
      
      Console.WriteLIne("Sorted alphabetically by last name:")
      If String.Compare(name1, index1, name2, index2, length, _
                        New CultureInfo("en-US"), CompareOptions.IgnoreCase) < 0 Then
         Console.WriteLine("{0}{1}{2}", name1, vbCrLf, name2)
      Else
         Console.WriteLine("{0}{1}{2}", name2, vbCrLf, name1)
      End If
   End Sub
End Module
' The example displays the following output;
'       Sorted alphabetically by last name:
'       John Doe
'       Jack Smith

注解

要比较的子字符串在启动strA位置处indexA并在strB位置处indexBThe substrings to compare start in strA at position indexA and in strB at position indexB. 第一个子字符串长度的长度strA减去indexAThe length of the first substring is the length of strA minus indexA. 第二个的子字符串的长度是长度strB减去indexBThe length of the second substring is the length of strB minus indexB.

要比较的字符数是较小的两个子字符串的长度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length参数必须为非负。The indexA, indexB, and length parameters must be nonnegative.

比较使用culture参数来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the culture parameter to obtain culture-specific information, such as casing rules and the alphabetical order of individual characters. 例如,某些组合字符被视为单个字符、 大写和小写字符进行比较以特定方式,可以指定特定区域性或依赖于字符的字符的排序顺序的前面或后面。For example, a particular culture could specify that certain combinations of characters be treated as a single character, that uppercase and lowercase characters be compared in a particular way, or that the sort order of a character depends on the characters that precede or follow it.

注意

Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法主要用于在排序或按字母顺序排列的操作中使用。The Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method is designed primarily for use in sorting or alphabetizing operations. 其值不应在方法调用的主要用途是确定这两个子字符串是否等效 (即,当方法调用的目的是要测试其返回值为 0) 时使用。It should not be used when the primary purpose of the method call is to determine whether two substrings are equivalent (that is, when the purpose of the method call is to test for a return value of zero). 若要确定两个字符串是否相等,请调用Equals方法。To determine whether two strings are equivalent, call the Equals method.

一个或两个strAstrB可以是nullOne or both of strA and strB can be null. 根据定义,任意字符串,其中包括String.Empty,比较结果大于 null 引用,且两个 null 的引用比较结果相等的。By definition, any string, including String.Empty, compares greater than a null reference, and two null references compare equal to each other.

可以通过进一步指定比较options参数,它包含一个或多个成员的System.Globalization.CompareOptions枚举。The comparison can be further specified by the options parameter, which consists of one or more members of the System.Globalization.CompareOptions enumeration. 但是,此方法的目的是执行区分区域性的字符串比较,因为CompareOptions.OrdinalCompareOptions.OrdinalIgnoreCase值不起任何作用。However, because the purpose of this method is to conduct a culture-sensitive string comparison, the CompareOptions.Ordinal and CompareOptions.OrdinalIgnoreCase values have no effect.

比较终止时发现不相等或已经比较了这两个子字符串。The comparison terminates when an inequality is discovered or both substrings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,则认为较大的剩余字符的字符串。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, the string with the remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法执行语言性的或区分区域性的比较时不考虑这些字符。The Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要识别您的比较中的可忽略字符,提供的值OrdinalOrdinalIgnoreCaseoptions参数。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the options parameter.

另请参阅

Compare(String, String, Boolean, CultureInfo) Compare(String, String, Boolean, CultureInfo) Compare(String, String, Boolean, CultureInfo) Compare(String, String, Boolean, CultureInfo)

比较两个指定的 String 对象(其中忽略或考虑其大小写,并使用区域性特定的信息干预比较),并返回一个整数,指示二者在排序顺序中的相对位置。Compares two specified String objects, ignoring or honoring their case, and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, System::String ^ strB, bool ignoreCase, System::Globalization::CultureInfo ^ culture);
public static int Compare (string strA, string strB, bool ignoreCase, System.Globalization.CultureInfo culture);
static member Compare : string * string * bool * System.Globalization.CultureInfo -> int
Public Shared Function Compare (strA As String, strB As String, ignoreCase As Boolean, culture As CultureInfo) As Integer

参数

strA
String String String String

要比较的第一个字符串。The first string to compare.

strB
String String String String

要比较的第二个字符串。The second string to compare.

ignoreCase
Boolean Boolean Boolean Boolean

若要在比较过程中忽略大小写,则为 true;否则为 falsetrue to ignore case during the comparison; otherwise, false.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

一个对象,提供区域性特定的比较信息。An object that supplies culture-specific comparison information.

返回

一个 32 位带符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 在排序顺序中位于 strB 之前。strA precedes strB in the sort order.
Zero strAstrB 在排序顺序中出现的位置相同。strA occurs in the same position as strB in the sort order.
大于零Greater than zero strA 在排序顺序中位于 strB 之后。strA follows strB in the sort order.

异常

示例

下面的示例演示如何区域性可能会影响比较。The following example demonstrates how culture can affect a comparison. 捷克语-捷克共和国区域性,在"ch"是单个字符的最大"d"。In Czech - Czech Republic culture, "ch" is a single character that is greater than "d". 但是,在英语-美国区域性"ch"包含两个字符,并且"c"小于"d"。However, in English - United States culture, "ch" consists of two characters, and "c" is less than "d".

using namespace System;
using namespace System::Globalization;
String^ symbol( int r )
{
   String^ s = "=";
   if ( r < 0 )
      s = "<";
   else
   if ( r > 0 )
      s = ">";


   return s;
}

int main()
{
   String^ str1 = "change";
   String^ str2 = "dollar";
   String^ relation = nullptr;
   relation = symbol( String::Compare( str1, str2, false, gcnew CultureInfo( "en-US" ) ) );
   Console::WriteLine( "For en-US: {0} {1} {2}", str1, relation, str2 );
   relation = symbol( String::Compare( str1, str2, false, gcnew CultureInfo( "cs-CZ" ) ) );
   Console::WriteLine( "For cs-CZ: {0} {1} {2}", str1, relation, str2 );
}

/*
This example produces the following results.
For en-US: change < dollar
For cs-CZ: change > dollar
*/
using System;
using System.Globalization;

class Sample {
    public static void Main() {
    String str1 = "change";
    String str2 = "dollar";
    String relation = null;

    relation = symbol( String.Compare(str1, str2, false, new CultureInfo("en-US")) );
    Console.WriteLine("For en-US: {0} {1} {2}", str1, relation, str2);

    relation = symbol( String.Compare(str1, str2, false, new CultureInfo("cs-CZ")) );
    Console.WriteLine("For cs-CZ: {0} {1} {2}", str1, relation, str2);
    }

    private static String symbol(int r) {
    String s = "=";
    if      (r < 0) s = "<";
    else if (r > 0) s = ">";
    return s;
    }
}
/*
This example produces the following results.
For en-US: change < dollar
For cs-CZ: change > dollar
*/
Imports System
Imports System.Globalization
 _

Class Sample
   Public Shared Sub Main()
      Dim str1 As [String] = "change"
      Dim str2 As [String] = "dollar"
      Dim relation As [String] = Nothing
      
      relation = symbol([String].Compare(str1, str2, False, New CultureInfo("en-US")))
      Console.WriteLine("For en-US: {0} {1} {2}", str1, relation, str2)
      
      relation = symbol([String].Compare(str1, str2, False, New CultureInfo("cs-CZ")))
      Console.WriteLine("For cs-CZ: {0} {1} {2}", str1, relation, str2)
   End Sub 'Main
   
   Private Shared Function symbol(r As Integer) As [String]
      Dim s As [String] = "="
      If r < 0 Then
         s = "<"
      Else
         If r > 0 Then
            s = ">"
         End If
      End If
      Return s
   End Function 'symbol
End Class 'Sample
'
'This example produces the following results.
'For en-US: change < dollar
'For cs-CZ: change > dollar
'

注解

比较使用culture参数来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the culture parameter to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字符的组合被视为单个字符或大写和小写字符进行比较以特定方式,可以指定区域性或字符的排序顺序取决于前的字符,或在其后。For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

使用单词排序规则执行比较。The comparison is performed using word sort rules. 有关 word、 字符串和顺序排序的详细信息,请参阅System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了两个字符串。The comparison terminates when an inequality is discovered or both strings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,然后其余的字符的字符串被视为更高版本。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, String, Boolean, CultureInfo)方法执行区分区域性的比较时不考虑此类字符。The Compare(String, String, Boolean, CultureInfo) method does not consider such characters when it performs a culture-sensitive comparison. 例如,如果运行下面的代码.NET Framework 4.NET Framework 4或更高版本,不区分大小写比较的"动物"与"Ani 邮件"(使用软连字符或 U + 00AD) 使用固定区域性指示两个字符串相等。For example, if the following code is run on the .NET Framework 4.NET Framework 4 or later, a case-insensitive comparison of "animal" with "Ani-mal" (using a soft hyphen, or U+00AD) using the invariant culture indicates that the two strings are equivalent.

[!code-csharpSystem.String.Compare#23] [!code-vbSystem.String.Compare#23][!code-csharpSystem.String.Compare#23] [!code-vbSystem.String.Compare#23] 若要识别的字符串比较中的可忽略字符,调用Compare(String, String, CultureInfo, CompareOptions)方法并提供的值OrdinalOrdinalIgnoreCaseoptions参数。To recognize ignorable characters in a string comparison, call the Compare(String, String, CultureInfo, CompareOptions) method and supply a value of either Ordinal or OrdinalIgnoreCase for the options parameter.

另请参阅

Compare(String, String, StringComparison) Compare(String, String, StringComparison) Compare(String, String, StringComparison) Compare(String, String, StringComparison)

使用指定的规则比较两个指定的 String 对象,并返回一个整数,指示二者在排序顺序中的相对位置。Compares two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, System::String ^ strB, StringComparison comparisonType);
public static int Compare (string strA, string strB, StringComparison comparisonType);
static member Compare : string * string * StringComparison -> int
Public Shared Function Compare (strA As String, strB As String, comparisonType As StringComparison) As Integer

参数

strA
String String String String

要比较的第一个字符串。The first string to compare.

strB
String String String String

要比较的第二个字符串。The second string to compare.

comparisonType
StringComparison StringComparison StringComparison StringComparison

一个枚举值,用于指定比较中要使用的规则。One of the enumeration values that specifies the rules to use in the comparison.

返回

一个 32 位带符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 在排序顺序中位于 strB 之前。strA precedes strB in the sort order.
Zero strAstrB 在排序顺序中的位置相同。strA is in the same position as strB in the sort order.
大于零Greater than zero strA 在排序顺序中位于 strB 之后。strA follows strB in the sort order.

异常

示例

以下示例比较了三个版本的字母"I"。The following example compares three versions of the letter "I". 区域性,是否忽略大小写,和是否执行序号比较的选择会影响结果。The results are affected by the choice of culture, whether case is ignored, and whether an ordinal comparison is performed.

// This example demonstrates the
// System.String.Compare(String, String, StringComparison) method.

using namespace System;
using namespace System::Threading;

void Test(int testStringIndex, int searchStringIndex, 
          StringComparison comparison, array<String^>^ testI, 
          array<String^>^ testNames)
{
    String^ resultFormat = "{0} is {1} {2}";
    String^ resultString = "equal to";
    int comparisonValue = 0;

    comparisonValue = String::Compare(testI[testStringIndex],
        testI[searchStringIndex], comparison);
    if (comparisonValue < 0)
    {
        resultString = "less than";
    }
    else if (comparisonValue > 0)
    {
        resultString = "greater than";
    }
    Console::WriteLine(resultFormat, testNames[testStringIndex], resultString,
        testNames[searchStringIndex]);
}

int main()
{
    String^ introMessage =
        "Compare three versions of the letter I using different " +
        "values of StringComparison.";

    // Define an array of strings where each element contains a version of
    // the letter I. (An array of strings is used so you can easily modify
    // this code example to test additional or different combinations of
    // strings.)

    array<String^>^ letterVariation = gcnew array<String^>(3);
    // LATIN SMALL LETTER I (U+0069)
    letterVariation[0] = "i";
    // LATIN SMALL LETTER DOTLESS I (U+0131)
    letterVariation[1] = L"\u0131";
    // LATIN CAPITAL LETTER I (U+0049)
    letterVariation[2] = "I";

    array<String^>^ unicodeNames = {
        "LATIN SMALL LETTER I (U+0069)",
        "LATIN SMALL LETTER DOTLESS I (U+0131)",
        "LATIN CAPITAL LETTER I (U+0049)"};

    array<StringComparison>^ comparisonValues = {
        StringComparison::CurrentCulture,
        StringComparison::CurrentCultureIgnoreCase,
        StringComparison::InvariantCulture,
        StringComparison::InvariantCultureIgnoreCase,
        StringComparison::Ordinal,
        StringComparison::OrdinalIgnoreCase};

    Console::Clear();
    Console::WriteLine(introMessage);

    // Display the current culture because the culture-specific comparisons
    // can produce different results with different cultures.
    Console::WriteLine("The current culture is {0}.{1}",
        Thread::CurrentThread->CurrentCulture->Name, Environment::NewLine);

    // Determine the relative sort order of three versions of the letter I.
    for each (StringComparison stringCmp in comparisonValues)
    {
        Console::WriteLine("StringComparison.{0}:", stringCmp);

        // LATIN SMALL LETTER I (U+0069) : LATIN SMALL LETTER DOTLESS I
        // (U+0131)
        Test(0, 1, stringCmp, letterVariation, unicodeNames);

        // LATIN SMALL LETTER I (U+0069) : LATIN CAPITAL LETTER I (U+0049)
        Test(0, 2, stringCmp, letterVariation, unicodeNames);

        // LATIN SMALL LETTER DOTLESS I (U+0131) : LATIN CAPITAL LETTER I
        // (U+0049)
        Test(1, 2, stringCmp, letterVariation, unicodeNames);

        Console::WriteLine();
    }
}

/*
This code example produces the following results:

Compare three versions of the letter I using different values of 
StringComparison.
The current culture is en-US.

StringComparison.CurrentCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER 
  DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN 
  CAPITAL LETTER I (U+0049)

StringComparison.CurrentCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER 
  DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN 
  CAPITAL LETTER I (U+0049)

StringComparison.InvariantCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER 
  DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN 
  CAPITAL LETTER I (U+0049)

StringComparison.InvariantCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER 
  DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN 
  CAPITAL LETTER I (U+0049)

StringComparison.Ordinal:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER 
  DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN 
  CAPITAL LETTER I (U+0049)

StringComparison.OrdinalIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER 
  DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN 
  CAPITAL LETTER I (U+0049)

*/
// This example demonstrates the 
// System.String.Compare(String, String, StringComparison) method.

using System;
using System.Threading;

class Sample 
{
    public static void Main() 
    {
    string intro = "Compare three versions of the letter I using different " + 
                   "values of StringComparison.";

// Define an array of strings where each element contains a version of the 
// letter I. (An array of strings is used so you can easily modify this 
// code example to test additional or different combinations of strings.)  

    string[] threeIs = new string[3];
// LATIN SMALL LETTER I (U+0069)
    threeIs[0] = "\u0069";
// LATIN SMALL LETTER DOTLESS I (U+0131)
    threeIs[1] = "\u0131";
// LATIN CAPITAL LETTER I (U+0049)
    threeIs[2] = "\u0049";

    string[] unicodeNames = 
             {
             "LATIN SMALL LETTER I (U+0069)", 
             "LATIN SMALL LETTER DOTLESS I (U+0131)", 
             "LATIN CAPITAL LETTER I (U+0049)"
             };

    StringComparison[] scValues = {
        StringComparison.CurrentCulture,
        StringComparison.CurrentCultureIgnoreCase,
        StringComparison.InvariantCulture,
        StringComparison.InvariantCultureIgnoreCase,
        StringComparison.Ordinal,
        StringComparison.OrdinalIgnoreCase };

//
    Console.Clear();
    Console.WriteLine(intro);

// Display the current culture because the culture-specific comparisons
// can produce different results with different cultures.
    Console.WriteLine("The current culture is {0}.\n", 
                       Thread.CurrentThread.CurrentCulture.Name);

// Determine the relative sort order of three versions of the letter I. 
    foreach (StringComparison sc in scValues)
        {
        Console.WriteLine("StringComparison.{0}:", sc);

// LATIN SMALL LETTER I (U+0069) : LATIN SMALL LETTER DOTLESS I (U+0131)
        Test(0, 1, sc, threeIs, unicodeNames);

// LATIN SMALL LETTER I (U+0069) : LATIN CAPITAL LETTER I (U+0049)
        Test(0, 2, sc, threeIs, unicodeNames);

// LATIN SMALL LETTER DOTLESS I (U+0131) : LATIN CAPITAL LETTER I (U+0049)
        Test(1, 2, sc, threeIs, unicodeNames);

        Console.WriteLine();
        }
    }

    protected static void Test(int x, int y, 
                               StringComparison comparison, 
                               string[] testI, string[] testNames)
    {
    string resultFmt = "{0} is {1} {2}";
    string result = "equal to";
    int cmpValue = 0;
//
    cmpValue = String.Compare(testI[x], testI[y], comparison);
    if      (cmpValue < 0) 
        result = "less than";
    else if (cmpValue > 0)
        result = "greater than";
    Console.WriteLine(resultFmt, testNames[x], result, testNames[y]);
    }
}

/*
This code example produces the following results:

Compare three versions of the letter I using different values of StringComparison.
The current culture is en-US.

StringComparison.CurrentCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.CurrentCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.InvariantCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.InvariantCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.Ordinal:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.OrdinalIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

*/
' This example demonstrates the 
' System.String.Compare(String, String, StringComparison) method.

Imports System
Imports System.Threading

Class Sample
    Public Shared Sub Main() 
        Dim intro As String = "Compare three versions of the letter I using different " & _
                              "values of StringComparison."
        
        ' Define an array of strings where each element contains a version of the 
        ' letter I. (An array of strings is used so you can easily modify this 
        ' code example to test additional or different combinations of strings.)  
        Dim threeIs(2) As String
        ' LATIN SMALL LETTER I (U+0069)
        threeIs(0) = "i"
        ' LATIN SMALL LETTER DOTLESS I (U+0131)
        threeIs(1) = "ı"
        ' LATIN CAPITAL LETTER I (U+0049)
        threeIs(2) = "I"
        
        Dim unicodeNames As String() =  { _
                            "LATIN SMALL LETTER I (U+0069)", _
                            "LATIN SMALL LETTER DOTLESS I (U+0131)", _
                            "LATIN CAPITAL LETTER I (U+0049)" }
        
        Dim scValues As StringComparison() =  { _
                            StringComparison.CurrentCulture, _
                            StringComparison.CurrentCultureIgnoreCase, _
                            StringComparison.InvariantCulture, _
                            StringComparison.InvariantCultureIgnoreCase, _
                            StringComparison.Ordinal, _
                            StringComparison.OrdinalIgnoreCase }
        '
        Console.Clear()
        Console.WriteLine(intro)
        
        ' Display the current culture because the culture-specific comparisons
        ' can produce different results with different cultures.
        Console.WriteLine("The current culture is {0}." & vbCrLf, _
                           Thread.CurrentThread.CurrentCulture.Name)
        
        ' Determine the relative sort order of three versions of the letter I. 
        Dim sc As StringComparison
        For Each sc In  scValues
            Console.WriteLine("StringComparison.{0}:", sc)
            
            ' LATIN SMALL LETTER I (U+0069) : LATIN SMALL LETTER DOTLESS I (U+0131)
            Test(0, 1, sc, threeIs, unicodeNames)
            
            ' LATIN SMALL LETTER I (U+0069) : LATIN CAPITAL LETTER I (U+0049)
            Test(0, 2, sc, threeIs, unicodeNames)
            
            ' LATIN SMALL LETTER DOTLESS I (U+0131) : LATIN CAPITAL LETTER I (U+0049)
            Test(1, 2, sc, threeIs, unicodeNames)
            
            Console.WriteLine()
        Next sc
    
    End Sub 'Main
    
    Protected Shared Sub Test(ByVal x As Integer, ByVal y As Integer, _
                              ByVal comparison As StringComparison, _
                              ByVal testI() As String, ByVal testNames() As String) 
        Dim resultFmt As String = "{0} is {1} {2}"
        Dim result As String = "equal to"
        Dim cmpValue As Integer = 0
        '
        cmpValue = String.Compare(testI(x), testI(y), comparison)
        If cmpValue < 0 Then
            result = "less than"
        ElseIf cmpValue > 0 Then
            result = "greater than"
        End If
        Console.WriteLine(resultFmt, testNames(x), result, testNames(y))
    
    End Sub 'Test
End Class 'Sample

'
'This code example produces the following results:
'
'Compare three versions of the letter I using different values of StringComparison.
'The current culture is en-US.
'
'StringComparison.CurrentCulture:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.CurrentCultureIgnoreCase:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.InvariantCulture:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.InvariantCultureIgnoreCase:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.Ordinal:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.OrdinalIgnoreCase:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'

注解

comparisonType参数指示是否比较应使用当前或固定区域性,接受或忽略大小写的比较数,或使用 word (区分区域性) 或序号 (不区分区域性的) 排序规则。The comparisonType parameter indicates whether the comparison should use the current or invariant culture, honor or ignore the case of the comparands, or use word (culture-sensitive) or ordinal (culture-insensitive) sort rules.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了两个字符串。The comparison terminates when an inequality is discovered or both strings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,其余字符的字符串则认为较大。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, String, StringComparison)方法执行区分区域性的比较时不考虑此类字符。The Compare(String, String, StringComparison) method does not consider such characters when it performs a culture-sensitive comparison. 若要识别您的比较中的可忽略字符,提供的值OrdinalOrdinalIgnoreCasecomparisonType参数。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另请参阅

Compare(String, String, Boolean) Compare(String, String, Boolean) Compare(String, String, Boolean) Compare(String, String, Boolean)

比较两个指定的 String 对象(其中忽略或考虑其大小写),并返回一个整数,指示二者在排序顺序中的相对位置。Compares two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, System::String ^ strB, bool ignoreCase);
public static int Compare (string strA, string strB, bool ignoreCase);
static member Compare : string * string * bool -> int
Public Shared Function Compare (strA As String, strB As String, ignoreCase As Boolean) As Integer

参数

strA
String String String String

要比较的第一个字符串。The first string to compare.

strB
String String String String

要比较的第二个字符串。The second string to compare.

ignoreCase
Boolean Boolean Boolean Boolean

若要在比较过程中忽略大小写,则为 true;否则为 falsetrue to ignore case during the comparison; otherwise, false.

返回

一个 32 位带符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 在排序顺序中位于 strB 之前。strA precedes strB in the sort order.
Zero strAstrB 在排序顺序中出现的位置相同。strA occurs in the same position as strB in the sort order.
大于零Greater than zero strA 在排序顺序中位于 strB 之后。strA follows strB in the sort order.

示例

下面的示例演示Compare(String, String, Boolean)方法相当于使用ToUpperToLower比较字符串时。The following example demonstrates that the Compare(String, String, Boolean) method is equivalent to using ToUpper or ToLower when comparing strings.

using namespace System;

void main()
{
   // Create upper-case characters from their Unicode code units.
   String^ stringUpper = "\x0041\x0042\x0043";

   // Create lower-case characters from their Unicode code units.
   String^ stringLower = "\x0061\x0062\x0063";

   // Display the strings.
   Console::WriteLine("Comparing '{0}' and '{1}':", 
                      stringUpper, stringLower);

   // Compare the uppercased strings; the result is true.
   Console::WriteLine("The Strings are equal when capitalized? {0}",
                      String::Compare(stringUpper->ToUpper(), stringLower->ToUpper()) == 0 
                                      ? "true" : "false");

   // The previous method call is equivalent to this Compare method, which ignores case.
   Console::WriteLine("The Strings are equal when case is ignored? {0}",
                      String::Compare(stringUpper, stringLower, true) == 0
                                      ? "true" : "false");
}
// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true
using System;

class Example
{
   static void Main()
   {
      // Create upper-case characters from their Unicode code units.
      String stringUpper = "\x0041\x0042\x0043";

      // Create lower-case characters from their Unicode code units.
      String stringLower = "\x0061\x0062\x0063";

      // Display the strings.
      Console.WriteLine("Comparing '{0}' and '{1}':", 
                        stringUpper, stringLower);

      // Compare the uppercased strings; the result is true.
      Console.WriteLine("The Strings are equal when capitalized? {0}",
                        String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) == 0 
                                       ? "true" : "false");

      // The previous method call is equivalent to this Compare method, which ignores case.
      Console.WriteLine("The Strings are equal when case is ignored? {0}",
                        String.Compare(stringUpper, stringLower, true) == 0
                                       ? "true" : "false" );
   }
} 
// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true
Public Module Example
   Public Sub Main()
      ' Create upper-case characters from their Unicode code units.
      Dim stringUpper As String = ChrW(&H41) + ChrW(&H42) + ChrW(&H43)

      ' Create lower-case characters from their Unicode code units.
      Dim stringLower As String = ChrW(&H61) + ChrW(&H62) + ChrW(&H63)

      ' Display the strings.
      Console.WriteLine("Comparing '{0}' and '{1}':", 
                        stringUpper, stringLower)

      ' Compare the uppercased strings; the result is true.
      Console.WriteLine("The Strings are equal when capitalized? {0}",
                        If(String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0, 
                                          "true", "false"))

      ' The previous method call is equivalent to this Compare method, which ignores case.
      Console.WriteLine("The Strings are equal when case is ignored? {0}",
                        If(String.Compare(stringUpper, stringLower, true) = 0,
                                          "true", "false"))
   End Sub
End Module 
' The example displays the following output:
'       Comparing 'ABC' and 'abc':
'       The Strings are equal when capitalized? true
'       The Strings are equal when case is ignored? true

注解

比较使用当前区域性来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字符的组合被视为单个字符或大写和小写字符进行比较以特定方式,可以指定区域性或字符的排序顺序取决于前的字符,或在其后。For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

使用单词排序规则执行比较。The comparison is performed using word sort rules. 有关 word、 字符串和顺序排序的详细信息,请参阅System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

比较字符串时,应调用Compare(String, String, StringComparison)方法,要求您显式指定该方法使用的字符串比较的类型。When comparing strings, you should call the Compare(String, String, StringComparison) method, which requires that you explicitly specify the type of string comparison that the method uses. 有关详细信息,请参阅有关使用字符串的最佳实践For more information, see Best Practices for Using Strings.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了两个字符串。The comparison terminates when an inequality is discovered or both strings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,然后其余的字符的字符串被视为更高版本。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, String, Boolean)方法执行区分区域性的比较时不考虑此类字符。The Compare(String, String, Boolean) method does not consider such characters when it performs a culture-sensitive comparison. 例如,如果运行下面的代码.NET Framework 4.NET Framework 4或更高版本,"动物"与"Ani 邮件"(使用软连字符或 U + 00AD) 的区分区域性的、 不区分大小写比较该值指示两个字符串是否相等。For example, if the following code is run on the .NET Framework 4.NET Framework 4 or later, a culture-sensitive, case-insensitive comparison of "animal" with "Ani-mal" (using a soft hyphen, or U+00AD) indicates that the two strings are equivalent.

[!code-csharpSystem.String.Compare#22] [!code-vbSystem.String.Compare#22][!code-csharpSystem.String.Compare#22] [!code-vbSystem.String.Compare#22] 若要识别的字符串比较中的可忽略字符,调用Compare(String, String, StringComparison)方法并提供的值OrdinalOrdinalIgnoreCasecomparisonType参数。To recognize ignorable characters in a string comparison, call the Compare(String, String, StringComparison) method and supply a value of either Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另请参阅

Compare(String, String) Compare(String, String) Compare(String, String) Compare(String, String)

比较两个指定的 String 对象,并返回一个指示二者在排序顺序中的相对位置的整数。Compares two specified String objects and returns an integer that indicates their relative position in the sort order.

public:
 static int Compare(System::String ^ strA, System::String ^ strB);
public static int Compare (string strA, string strB);
static member Compare : string * string -> int
Public Shared Function Compare (strA As String, strB As String) As Integer

参数

strA
String String String String

要比较的第一个字符串。The first string to compare.

strB
String String String String

要比较的第二个字符串。The second string to compare.

返回

一个 32 位带符号整数,指示两个比较数之间的词法关系。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 条件Condition
小于零Less than zero strA 在排序顺序中位于 strB 之前。strA precedes strB in the sort order.
Zero strAstrB 在排序顺序中出现的位置相同。strA occurs in the same position as strB in the sort order.
大于零Greater than zero strA 在排序顺序中位于 strB 之后。strA follows strB in the sort order.

示例

下面的示例调用Compare(String, String)方法来比较三个集的字符串。The following example calls the Compare(String, String) method to compare three sets of strings.

using namespace System;

void main()
{
   // Create upper-case characters from their Unicode code units.
   String^ stringUpper = "\x0041\x0042\x0043";

   // Create lower-case characters from their Unicode code units.
   String^ stringLower = "\x0061\x0062\x0063";

   // Display the strings.
   Console::WriteLine("Comparing '{0}' and '{1}':", 
                      stringUpper, stringLower);

   // Compare the uppercased strings; the result is true.
   Console::WriteLine("The Strings are equal when capitalized? {0}",
                      String::Compare(stringUpper->ToUpper(), stringLower->ToUpper()) == 0 
                                      ? "true" : "false");

   // The previous method call is equivalent to this Compare method, which ignores case.
   Console::WriteLine("The Strings are equal when case is ignored? {0}",
                      String::Compare(stringUpper, stringLower, true) == 0
                                      ? "true" : "false");
}
// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true
using System;

class Example
{
   static void Main()
   {
      // Create upper-case characters from their Unicode code units.
      String stringUpper = "\x0041\x0042\x0043";

      // Create lower-case characters from their Unicode code units.
      String stringLower = "\x0061\x0062\x0063";

      // Display the strings.
      Console.WriteLine("Comparing '{0}' and '{1}':", 
                        stringUpper, stringLower);

      // Compare the uppercased strings; the result is true.
      Console.WriteLine("The Strings are equal when capitalized? {0}",
                        String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) == 0 
                                       ? "true" : "false");

      // The previous method call is equivalent to this Compare method, which ignores case.
      Console.WriteLine("The Strings are equal when case is ignored? {0}",
                        String.Compare(stringUpper, stringLower, true) == 0
                                       ? "true" : "false" );
   }
} 
// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true
Public Module Example
   Public Sub Main()
      ' Create upper-case characters from their Unicode code units.
      Dim stringUpper As String = ChrW(&H41) + ChrW(&H42) + ChrW(&H43)

      ' Create lower-case characters from their Unicode code units.
      Dim stringLower As String = ChrW(&H61) + ChrW(&H62) + ChrW(&H63)

      ' Display the strings.
      Console.WriteLine("Comparing '{0}' and '{1}':", 
                        stringUpper, stringLower)

      ' Compare the uppercased strings; the result is true.
      Console.WriteLine("The Strings are equal when capitalized? {0}",
                        If(String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0, 
                                          "true", "false"))

      ' The previous method call is equivalent to this Compare method, which ignores case.
      Console.WriteLine("The Strings are equal when case is ignored? {0}",
                        If(String.Compare(stringUpper, stringLower, true) = 0,
                                          "true", "false"))
   End Sub
End Module 
' The example displays the following output:
'       Comparing 'ABC' and 'abc':
'       The Strings are equal when capitalized? true
'       The Strings are equal when case is ignored? true

在以下示例中,ReverseStringComparer类演示如何评估使用的两个字符串Compare方法。In the following example, the ReverseStringComparer class demonstrates how you can evaluate two strings with the Compare method.

using namespace System;
using namespace System::Text;
using namespace System::Collections;

ref class ReverseStringComparer: public IComparer
{
public:
   virtual int Compare( Object^ x, Object^ y )
   {
      String^ s1 = dynamic_cast<String^>(x);
      String^ s2 = dynamic_cast<String^>(y);

      //negate the return value to get the reverse order
      return  -String::Compare( s1, s2 );
   }

};

void PrintValues( String^ title, IEnumerable^ myList )
{
   Console::Write( "{0,10}: ", title );
   StringBuilder^ sb = gcnew StringBuilder;
   {
      IEnumerator^ en = myList->GetEnumerator();
      String^ s;
      while ( en->MoveNext() )
      {
         s = en->Current->ToString();
         sb->AppendFormat(  "{0}, ", s );
      }
   }
   sb->Remove( sb->Length - 2, 2 );
   Console::WriteLine( sb );
}

void main()
{
   // Creates and initializes a new ArrayList.
   ArrayList^ myAL = gcnew ArrayList;
   myAL->Add( "Eric" );
   myAL->Add( "Mark" );
   myAL->Add( "Lance" );
   myAL->Add( "Rob" );
   myAL->Add( "Kris" );
   myAL->Add( "Brad" );
   myAL->Add( "Kit" );
   myAL->Add( "Bradley" );
   myAL->Add( "Keith" );
   myAL->Add( "Susan" );

   // Displays the properties and values of the ArrayList.
   Console::WriteLine( "Count: {0}", myAL->Count.ToString() );

   PrintValues( "Unsorted", myAL );

   myAL->Sort();
   PrintValues( "Sorted", myAL );

   myAL->Sort( gcnew ReverseStringComparer );
   PrintValues( "Reverse", myAL );

   array<String^>^names = dynamic_cast<array<String^>^>(myAL->ToArray( String::typeid ));
}
using System;
using System.Text;
using System.Collections;

public class SamplesArrayList  {

	public static void Main()  {
		// Creates and initializes a new ArrayList.
		ArrayList myAL = new ArrayList();
		myAL.Add("Eric");
		myAL.Add("Mark");
		myAL.Add("Lance");
		myAL.Add("Rob");
		myAL.Add("Kris");
		myAL.Add("Brad");
		myAL.Add("Kit");
		myAL.Add("Bradley");
		myAL.Add("Keith");
		myAL.Add("Susan");
	
		// Displays the properties and values of	the	ArrayList.
		Console.WriteLine( "Count: {0}", myAL.Count );
		
		PrintValues ("Unsorted", myAL );
		myAL.Sort();
		PrintValues("Sorted", myAL );
		myAL.Sort(new ReverseStringComparer() );
		PrintValues ("Reverse" , myAL );


		string [] names = (string[]) myAL.ToArray (typeof(string));


	}
	public static void PrintValues(string title, IEnumerable	myList )  {
		Console.Write ("{0,10}: ", title);
		StringBuilder sb = new StringBuilder();
		foreach (string s in myList) {
			sb.AppendFormat( "{0}, ", s);
		}
		sb.Remove (sb.Length-2,2);
		Console.WriteLine(sb);
	}
}
public class ReverseStringComparer : IComparer {
   public int Compare (object x, object y) {
	   string s1 = x as string;
	   string s2 = y as string;	  
	   //negate the return value to get the reverse order
	   return - String.Compare (s1,s2);

   }
}

Imports System
Imports System.Text
Imports System.Collections



Public Class SamplesArrayList
    
    
    Public Shared Sub Main()
        Dim myAL As New ArrayList()
        ' Creates and initializes a new ArrayList.
        myAL.Add("Eric")
        myAL.Add("Mark")
        myAL.Add("Lance")
        myAL.Add("Rob")
        myAL.Add("Kris")
        myAL.Add("Brad")
        myAL.Add("Kit")
        myAL.Add("Bradley")
        myAL.Add("Keith")
        myAL.Add("Susan")
        
        ' Displays the properties and values of	the	ArrayList.
        Console.WriteLine("Count: {0}", myAL.Count)
        PrintValues("Unsorted", myAL)
        myAL.Sort()
        PrintValues("Sorted", myAL)
        Dim comp as New ReverseStringComparer
        myAL.Sort(comp)
        PrintValues("Reverse", myAL)

        Dim names As String() = CType(myAL.ToArray(GetType(String)), String())
    End Sub 'Main
   
   
    
    Public Shared Sub PrintValues(title As String, myList As IEnumerable)
        Console.Write("{0,10}: ", title)
        Dim sb As New StringBuilder()
        Dim s As String
        For Each s In  myList
            sb.AppendFormat("{0}, ", s)
        Next s
        sb.Remove(sb.Length - 2, 2)
        Console.WriteLine(sb)
    End Sub 'PrintValues
End Class 'SamplesArrayList

Public Class ReverseStringComparer 
  Implements IComparer
    
     Function Compare(x As Object, y As Object) As Integer implements IComparer.Compare
        Dim s1 As String = CStr (x)
        Dim s2 As String = CStr (y)
        
        'negate the return value to get the reverse order
        Return - [String].Compare(s1, s2)
    
    End Function 'Compare
End Class 'ReverseStringComparer

注解

比较使用当前区域性来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字符的组合被视为单个字符或大写和小写字符进行比较以特定方式,可以指定区域性或字符的排序顺序取决于前的字符,或在其后。For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

使用单词排序规则执行比较。The comparison is performed using word sort rules. 有关 word、 字符串和顺序排序的详细信息,请参阅System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

比较字符串时,应调用Compare(String, String, StringComparison)方法,要求您显式指定该方法使用的字符串比较的类型。When comparing strings, you should call the Compare(String, String, StringComparison) method, which requires that you explicitly specify the type of string comparison that the method uses. 有关详细信息,请参阅有关使用字符串的最佳实践For more information, see Best Practices for Using Strings.

可以是一个或两个比较数nullOne or both comparands can be null. 根据定义,任意字符串,其中包括空字符串 (""),进行比较,大于 null 的引用;和两个 null 引用的比较结果相等的。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

比较终止时发现不相等或已经比较了两个字符串。The comparison terminates when an inequality is discovered or both strings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,然后其余的字符的字符串被视为更高版本。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. 返回值为执行的最后一个比较的结果。The return value is the result of the last comparison performed.

当比较受特定于区域性的大小写规则,会发生意外的结果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其语,下面的示例生成错误结果由于土耳其语中的文件系统对字母"i"不使用语言的大小写规则"文件"中。For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, true) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

进行比较的路径名称为"file"使用序号比较。Compare the path name to "file" using an ordinal comparison. 若要执行此操作的正确代码如下所示:The correct code to do this is as follows:

static bool IsFileURI(String^ path)
{
    return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0);
}
static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}
Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

调用方说明

字符集包括可忽略字符。Character sets include ignorable characters. Compare(String, String)方法执行区分区域性的比较时不考虑此类字符。The Compare(String, String) method does not consider such characters when it performs a culture-sensitive comparison. 例如,如果运行下面的代码.NET Framework 4.NET Framework 4或更高版本,"动物"与"ani 邮件"(使用软连字符或 U + 00AD) 的区分区域性的比较该值指示两个字符串是否相等。For example, if the following code is run on the .NET Framework 4.NET Framework 4 or later, a culture-sensitive comparison of "animal" with "ani-mal" (using a soft hyphen, or U+00AD) indicates that the two strings are equivalent.

[!code-csharpSystem.String.Compare#21] [!code-vbSystem.String.Compare#21][!code-csharpSystem.String.Compare#21] [!code-vbSystem.String.Compare#21] 若要识别的字符串比较中的可忽略字符,调用Compare(String, String, StringComparison)方法并提供的值OrdinalOrdinalIgnoreCasecomparisonType参数。To recognize ignorable characters in a string comparison, call the Compare(String, String, StringComparison) method and supply a value of either Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另请参阅

Compare(String, String, CultureInfo, CompareOptions) Compare(String, String, CultureInfo, CompareOptions) Compare(String, String, CultureInfo, CompareOptions) Compare(String, String, CultureInfo, CompareOptions)

对两个指定的 String 对象进行比较,使用指定的比较选项和区域性特定的信息来影响比较,并返回一个整数,该整数指示这两个字符串在排序顺序中的关系。Compares two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two strings to each other in the sort order.

public:
 static int Compare(System::String ^ strA, System::String ^ strB, System::Globalization::CultureInfo ^ culture, System::Globalization::CompareOptions options);
public static int Compare (string strA, string strB, System.Globalization.CultureInfo culture, System.Globalization.CompareOptions options);
static member Compare : string * string * System.Globalization.CultureInfo * System.Globalization.CompareOptions -> int
Public Shared Function Compare (strA As String, strB As String, culture As CultureInfo, options As CompareOptions) As Integer

参数

strA
String String String String

要比较的第一个字符串。The first string to compare.

strB
String String String String

要比较的第二个字符串。The second string to compare.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

提供区域性特定的比较信息的区域性。The culture that supplies culture-specific comparison information.

options
CompareOptions CompareOptions CompareOptions CompareOptions

要在执行比较时使用的选项(如忽略大小写或符号)。Options to use when performing the comparison (such as ignoring case or symbols).

返回

一个 32 位带符号整数,该整数指示 strAstrB 之间的词法关系,如下表所示A 32-bit signed integer that indicates the lexical relationship between strA and strB, as shown in the following table

Value 条件Condition
小于零Less than zero strA 在排序顺序中位于 strB 之前。strA precedes strB in the sort order.

Zero strAstrB 在排序顺序中出现的位置相同。strA occurs in the same position as strB in the sort order.

大于零Greater than zero strA 在排序顺序中位于 strB 之后。strA follows strB in the sort order.

异常

示例

下面的示例对两个字符串进行比较三个不同的方式: 使用 EN-US 区域性; 语义比较使用 EN-US 区域性; 语言区分大小写的比较并使用序号比较。The following example compares two strings in three different ways: using linguistic comparison for the en-US culture; using linguistic case-sensitive comparison for the en-US culture; and using an ordinal comparison. 它演示了如何比较的三种方法生成三个不同的结果。It illustrates how the three methods of comparison produce three different results.

using namespace System;
using namespace System::Globalization;

public ref class Example
{
public:
   static void Main()
   {
      String^ string1 = "brother";
      String^ string2 = "Brother";
      String^ relation;
      int result;

      // Cultural (linguistic) comparison.
      result = String::Compare(string1, string2, gcnew CultureInfo("en-US"),
                              CompareOptions::None);
      if (result > 0)
         relation = "comes after";
      else if (result == 0)
         relation = "is the same as";
      else
         relation = "comes before";

      Console::WriteLine("'{0}' {1} '{2}'.",
                        string1, relation, string2);

      // Cultural (linguistic) case-insensitive comparison.
      result = String::Compare(string1, string2, gcnew CultureInfo("en-US"),
                              CompareOptions::IgnoreCase);
      if (result > 0)
         relation = "comes after";
      else if (result == 0)
         relation = "is the same as";
      else
         relation = "comes before";

      Console::WriteLine("'{0}' {1} '{2}'.",
                        string1, relation, string2);

       // Culture-insensitive ordinal comparison.
      result = String::CompareOrdinal(string1, string2);
      if (result > 0)
         relation = "comes after";
      else if (result == 0)
         relation = "is the same as";
      else
         relation = "comes before";

      Console::WriteLine("'{0}' {1} '{2}'.",
                        string1, relation, string2);
   }
};

int main()
{
    Example::Main();
}


// The example produces the following output:
//    'brother' comes before 'Brother'.
//    'brother' is the same as 'Brother'.
//    'brother' comes after 'Brother'.
using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string string1 = "brother";
      string string2 = "Brother";
      string relation;
      int result;
      
      // Cultural (linguistic) comparison.
      result = String.Compare(string1, string2, new CultureInfo("en-US"), 
                              CompareOptions.None);
      if (result > 0)
         relation = "comes after";
      else if (result == 0)
         relation = "is the same as";
      else
         relation = "comes before";

      Console.WriteLine("'{0}' {1} '{2}'.", 
                        string1, relation, string2);

      // Cultural (linguistic) case-insensitive comparison.
      result = String.Compare(string1, string2, new CultureInfo("en-US"), 
                              CompareOptions.IgnoreCase);
      if (result > 0)
         relation = "comes after";
      else if (result == 0)
         relation = "is the same as";
      else
         relation = "comes before";

      Console.WriteLine("'{0}' {1} '{2}'.", 
                        string1, relation, string2);
 
       // Culture-insensitive ordinal comparison.
      result = String.CompareOrdinal(string1, string2);
      if (result > 0)
         relation = "comes after";
      else if (result == 0)
         relation = "is the same as";
      else
         relation = "comes before";

      Console.WriteLine("'{0}' {1} '{2}'.", 
                        string1, relation, string2);
   }
}
// The example produces the following output:
//    'brother' comes before 'Brother'.   
//    'brother' is the same as 'Brother'.
//    'brother' comes after 'Brother'.
Imports System.Globalization

Public Module Example
   Public Sub Main()
      Dim string1 As String = "brother"
      Dim string2 As String = "Brother"
      Dim relation As String
      Dim result As Integer

      ' Cultural (linguistic) comparison.
      result = String.Compare(string1, string2, _
                              New CultureInfo("en-US"), CompareOptions.None)
      If result > 0 Then
         relation = "comes after"
      ElseIf result = 0 Then
         relation = "is the same as"
      Else
         relation = "comes before"
      End If
      Console.WriteLine("'{0}' {1} '{2}'.", string1, relation, string2)

      ' Cultural (linguistic) case-insensitive comparison.
      result = String.Compare(string1, string2, _
                              New CultureInfo("en-US"), CompareOptions.IgnoreCase)
      If result > 0 Then
         relation = "comes after"
      ElseIf result = 0 Then
         relation = "is the same as"
      Else
         relation = "comes before"
      End If
      Console.WriteLine("'{0}' {1} '{2}'.", string1, relation, string2)

      ' Culture-insensitive ordinal comparison.
      result = String.CompareOrdinal(string1, string2)
      If result > 0 Then
         relation = "comes after"
      ElseIf result = 0 Then
         relation = "is the same as"
      Else
         relation = "comes before"
      End If
      Console.WriteLine("'{0}' {1} '{2}'.", string1, relation, string2)
   End Sub
End Module
' The example produces the following output:
'    'brother' comes before 'Brother'.   
'    'brother' is the same as 'Brother'.
'    'brother' comes after 'Brother'.

注解

比较使用culture参数来获取特定于区域性的信息,如大小写规则和单个字符的字母顺序。The comparison uses the culture parameter to obtain culture-specific information, such as casing rules and the alphabetical order of individual characters. 例如,某些组合字符被视为单个字符、 大写和小写字符进行比较以特定方式,可以指定特定区域性或依赖于字符的字符的排序顺序的前面或后面。For example, a particular culture could specify that certain combinations of characters be treated as a single character, that uppercase and lowercase characters be compared in a particular way, or that the sort order of a character depends on the characters that precede or follow it.

注意

Compare(String, String, CultureInfo, CompareOptions)方法主要用于在排序或按字母顺序排列的操作中使用。The Compare(String, String, CultureInfo, CompareOptions) method is designed primarily for use in sorting or alphabetizing operations. 其值不应在方法调用的主要用途是确定两个字符串是否相等 (即,当方法调用的目的是要测试其返回值为 0) 时使用。It should not be used when the primary purpose of the method call is to determine whether two strings are equivalent (that is, when the purpose of the method call is to test for a return value of zero). 若要确定两个字符串是否相等,请调用Equals方法。To determine whether two strings are equivalent, call the Equals method.

可以通过进一步指定比较options参数,它包含一个或多个成员的CompareOptions枚举。The comparison can be further specified by the options parameter, which consists of one or more members of the CompareOptions enumeration. 但是,此方法的目的是执行区分区域性的字符串比较,因为CompareOptions.OrdinalCompareOptions.OrdinalIgnoreCase值不起任何作用。However, because the purpose of this method is to conduct a culture-sensitive string comparison, the CompareOptions.Ordinal and CompareOptions.OrdinalIgnoreCase values have no effect.

可以是一个或两个比较数nullEither or both comparands can be null. 根据定义,任意字符串,其中包括String.Empty,比较结果大于 null 引用,且两个 null 的引用比较结果相等的。By definition, any string, including String.Empty, compares greater than a null reference, and two null references compare equal to each other.

比较终止时发现不相等或已经比较了两个字符串。The comparison terminates when an inequality is discovered or both strings have been compared. 但是,如果两个字符串比较等于一个字符串的末尾,但在其他字符串有个剩余字符,则认为较大的剩余字符的字符串。However, if the two strings compare equal to the end of one string, and the other string has characters remaining, the string with the remaining characters is considered greater.

调用方说明

字符集包括可忽略字符,在执行语言性的或区分区域性的比较时该字符不被考虑。Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Compare(String, String, CultureInfo, CompareOptions)方法执行区分区域性的比较时不考虑此类字符。The Compare(String, String, CultureInfo, CompareOptions) method does not consider such characters when it performs a culture-sensitive comparison. 若要识别您的比较中的可忽略字符,提供的值OrdinalOrdinalIgnoreCaseoptions参数。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the options parameter.

另请参阅

适用于