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

定義

比較兩個指定的 String 物件,並傳回一個整數,指出它們在排序順序中的相對位置。Compares two specified String objects and returns an integer that indicates their relative position in the sort order.

多載

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)

比較兩個指定之 String 物件的子字串,忽略或區分兩者的大小寫,並傳回一個整數,表示兩者在排序順序中的相對位置。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)

比較兩個指定之 String 物件的子字串,忽略或區分兩者的大小寫,並使用文化特性資訊來影響比較,然後傳回一個整數,表示兩者在排序順序中的相對位置。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)

使用指定的規則比較兩個指定之 String 物件的子字串,並傳回一個整數,表示兩者在排序順序中的相對位置。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)

比較兩個指定的 String 物件子字串,並傳回一個整數,指出它們在排序順序中的相對位置。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)

比較兩個指定的 String 物件的子字串,使用指定的比較選項及特定文化特性資訊影響比較,然後傳回整數,這個整數表示這兩個子字串在排序次序中彼此的關聯性。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)

比較兩個指定的 String 物件,忽略或區分兩者的大小寫,並使用特定文化特性資訊來影響比較,然後傳回一個整數,表示兩者在排序順序中的相對位置。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)

使用指定的規則比較兩個指定的 String 物件,並傳回一個整數,表示兩者在排序順序中的相對位置。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)

比較兩個指定的 String 物件,忽略或區分兩者的大小寫,並傳回一個整數,表示兩者在排序順序中的相對位置。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)

比較兩個指定的 String 物件,並傳回一個整數,指出它們在排序順序中的相對位置。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)

比較兩個指定的 String 物件,使用指定的比較選項及特定文化特性資訊影響比較,然後傳回整數,這個整數表示這兩個字串在排序次序中彼此的關聯性。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.

備註

Compare 方法的所有多載會傳回 32 位元帶正負號整數,指出兩個比較元之間的語彙關係。All overloads of the Compare method return a 32-bit signed integer indicating the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero 第一個子字串在排序次序中之前的第二個的子字串。The first substring precedes the second substring in the sort order.
Zero 子字串出現在排序次序中的相同位置,或 length 為零。The substrings occur in the same position in the sort order, or length is zero.
大於零Greater than zero 第一個子字串會遵循第二個的子字串在排序次序。The first substring follows the second substring in the sort order.

警告

可能的話,您應該呼叫的多載Compare方法,其中包含StringComparison參數。Whenever possible, you should call an overload of the Compare method that includes a StringComparison parameter. 如需詳細資訊,請參閱使用字串的最佳做法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)

比較兩個指定之 String 物件的子字串,忽略或區分兩者的大小寫,並傳回一個整數,表示兩者在排序順序中的相對位置。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

參數

strA
String String String String

要用於比較中的第一個字串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

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

strB
String String String String

要用於比較的第二個字串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

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

length
Int32 Int32 Int32 Int32

要比較之子字串的字元數上限。The maximum number of characters in the substrings to compare.

ignoreCase
Boolean Boolean Boolean Boolean

true 表示在比較時忽略大小寫,否則為 falsetrue to ignore case during the comparison; otherwise, false.

傳回

32 位元帶正負號的整數,表示兩個比較元之間的語彙關係。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero strA 中的子字串的排序次序在 strB 中的子字串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字串出現在排序次序中的相同位置,或 length 為零。The substrings occur in the same position in the sort order, or length is zero.
大於零Greater than zero strA 中的子字串的排序次序在 strB 中的子字串之後。The substring in strA follows the substring in strB in the sort order.

例外狀況

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

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

-或--or- indexAindexBlength 是負數。indexA, indexB, or length is negative.

-或--or- indexAindexBnull,且 length 大於零。Either indexA or indexB is null, and length is greater than zero.

範例

下列範例會在案例中的兩個比較的兩個只有不同的子字串。The following example performs two comparisons of two substrings that only differ in case. 第一個比較會忽略大小寫,第二個比較會考慮大小寫。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'.
'

備註

要比較之子字串開始strA位於indexA,然後在strBindexBThe substrings to compare start in strA at indexA, and in strB at indexB. 兩者indexAindexB之以零起始的是,也就是中的第一個字元strAstrB位在位置零。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero. 第一個子字串的長度等於長度strAindexA再加 1。The length of the first substring is equal to the length of strA minus indexA plus one. 第二個的子字串長度會等於長度strBindexB再加 1。The length of the second substring is equal to the length of strB minus indexB plus one.

要比較的字元數是較小的兩個子字串,長度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length參數不可為負值。The indexA, indexB, and length parameters must be nonnegative.

比較會使用目前文化特性,若要取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字元的組合視為單一字元,或以特定的方式,比較大寫和小寫字元,可以指定文化特性或字元的排序順序取決於前面的字元,或跟隨它。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.

使用字組排序規則來進行比較。The comparison is performed using word sort rules. 如需有關字、 字串和序數排序的詳細資訊,請參閱System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

當比較字串,您應該呼叫Compare(String, Int32, String, Int32, Int32, StringComparison)方法,它會要求您明確指定此方法會使用的字串比較的型別。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. 如需詳細資訊,請參閱使用字串的最佳做法For more information, see Best Practices for Using Strings.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或兩個子字串都比較之後,將會結束比較。The comparison terminates when an inequality is discovered or both substrings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,然後其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

路徑名稱必須以不變的方式進行比較。The path name needs to be compared in an invariant manner. 若要這樣做正確的程式碼如下所示。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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, Boolean)方法執行語言或文化特性的比較時不會考慮這些字元。The Compare(String, Int32, String, Int32, Int32, Boolean) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要識別可忽略的字元在比較中,呼叫Compare(String, Int32, String, Int32, Int32, StringComparison)方法,並提供的值OrdinalOrdinalIgnoreCasecomparisonType參數。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.

另請參閱

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)

比較兩個指定之 String 物件的子字串,忽略或區分兩者的大小寫,並使用文化特性資訊來影響比較,然後傳回一個整數,表示兩者在排序順序中的相對位置。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

參數

strA
String String String String

要用於比較中的第一個字串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

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

strB
String String String String

要用於比較的第二個字串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

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

length
Int32 Int32 Int32 Int32

要比較之子字串的字元數上限。The maximum number of characters in the substrings to compare.

ignoreCase
Boolean Boolean Boolean Boolean

true 表示在比較時忽略大小寫,否則為 falsetrue to ignore case during the comparison; otherwise, false.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

物件,提供文化特性相關的比較資訊。An object that supplies culture-specific comparison information.

傳回

整數,表示兩個比較元 (Comparand) 之間的語彙關係。An integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero strA 中的子字串的排序次序在 strB 中的子字串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字串出現在排序次序中的相同位置,或 length 為零。The substrings occur in the same position in the sort order, or length is zero.
大於零Greater than zero strA 中的子字串的排序次序在 strB 中的子字串之後。The substring in strA follows the substring in strB in the sort order.

例外狀況

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

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

-或--or- indexAindexBlength 是負數。indexA, indexB, or length is negative.

-或--or- strAstrBnull,且 length 大於零。Either strA or strB is null, and length is greater than zero.

範例

下列範例會比較這兩個子字串使用不同的文化特性並忽略大小寫的子字串。The following example compares two substrings using different cultures and ignoring the case of the substrings. 文化特性的選擇會影響如何字母"I"是比較。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'.
'

備註

要比較之子字串開始strA位於indexA,然後在strBindexBThe substrings to compare start in strA at indexA, and in strB at indexB. 兩者indexAindexB是以零為起始,也就是中的第一個字元strAstrB是在位置零、 放在其中一個。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero, not position one. 第一個子字串的長度等於長度strAindexA再加 1。The length of the first substring is equal to the length of strA minus indexA plus one. 第二個的子字串長度會等於長度strBindexB再加 1。The length of the second substring is equal to the length of strB minus indexB plus one.

要比較的字元數是較小的兩個子字串,長度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length參數不可為負值。The indexA, indexB, and length parameters must be nonnegative.

比較使用culture參數來取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the culture parameter to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字元的組合視為單一字元,或以特定的方式,比較大寫和小寫字元,可以指定文化特性或字元的排序順序取決於前面的字元,或跟隨它。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.

使用字組排序規則來進行比較。The comparison is performed using word sort rules. 如需有關字、 字串和序數排序的詳細資訊,請參閱System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或兩個子字串都比較之後,將會結束比較。The comparison terminates when an inequality is discovered or both substrings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,然後其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)方法執行語言或文化特性的比較時不會考慮這些字元。The Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要識別可忽略的字元在比較中,呼叫Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法,並提供的值OrdinalOrdinalIgnoreCaseoptions參數。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.

另請參閱

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)

使用指定的規則比較兩個指定之 String 物件的子字串,並傳回一個整數,表示兩者在排序順序中的相對位置。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

參數

strA
String String String String

要用於比較中的第一個字串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

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

strB
String String String String

要用於比較的第二個字串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

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

length
Int32 Int32 Int32 Int32

要比較之子字串的字元數上限。The maximum number of characters in the substrings to compare.

comparisonType
StringComparison StringComparison StringComparison StringComparison

其中一個列舉值,指定要用於比較的規則。One of the enumeration values that specifies the rules to use in the comparison.

傳回

32 位元帶正負號的整數,表示兩個比較元之間的語彙關係。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero strA 中的子字串的排序次序在 strB 中的子字串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 相同排序次序中相同位置出現的子字串,或 length 參數為零。The substrings occur in the same position in the sort order, or the length parameter is zero.
大於零Greater than zero strA 中的子字串的排序次序在 strB 中的子字串之後。The substring in strA follows the substring in strB in the sort order.

例外狀況

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

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

-或--or- indexAindexBlength 是負數。indexA, indexB, or length is negative.

-或--or- indexAindexBnull,且 length 大於零。Either indexA or indexB is null, and length is greater than zero.

範例

下列範例會比較這兩個子字串。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'.
'

備註

要比較之子字串開始strA位於indexA然後在strBindexBThe substrings to compare start in strA at indexA and in strB at indexB. 兩者indexAindexB是以零為起始,也就是中的第一個字元strAstrB是在位置零、 放在其中一個。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero, not position one. 第一個子字串的長度等於長度strAindexA再加 1。The length of the first substring is equal to the length of strA minus indexA plus one. 第二個的子字串長度會等於長度strBindexB再加 1。The length of the second substring is equal to the length of strB minus indexB plus one.

要比較的字元數是較小的兩個子字串,長度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length參數不可為負值。The indexA, indexB, and length parameters must be nonnegative.

comparisonType參數會指出是否比較應該使用目前或而異的文化特性,接受或忽略大小寫的比較元,或使用 word (區分文化特性) 或序數 (不區分文化特性) 的排序規則。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.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或兩個子字串都比較之後,將會結束比較。The comparison terminates when an inequality is discovered or both substrings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, StringComparison)方法執行語言或文化特性的比較時不會考慮這些字元。The Compare(String, Int32, String, Int32, Int32, StringComparison) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要識別可忽略的字元在比較中,提供的值Ordinal或是OrdinalIgnoreCasecomparisonType參數。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另請參閱

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

比較兩個指定的 String 物件子字串,並傳回一個整數,指出它們在排序順序中的相對位置。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

參數

strA
String String String String

要用於比較中的第一個字串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

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

strB
String String String String

要用於比較的第二個字串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

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

length
Int32 Int32 Int32 Int32

要比較之子字串的字元數上限。The maximum number of characters in the substrings to compare.

傳回

32 位元帶正負號整數,指出兩比較元的語彙關係。A 32-bit signed integer indicating the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero strA 中的子字串的排序次序在 strB 中的子字串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字串出現在排序次序中的相同位置,或 length 為零。The substrings occur in the same position in the sort order, or length is zero.
大於零Greater than zero strA 中的子字串的排序次序在 strB 中的子字串之後。The substring in strA follows the substring in strB in the sort order.

例外狀況

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

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

-或--or- indexAindexBlength 是負數。indexA, indexB, or length is negative.

-或--or- indexAindexBnull,且 length 大於零。Either indexA or indexB is null, and length is greater than zero.

範例

下列範例會比較這兩個子字串。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'.
'

備註

要比較之子字串開始strA位於indexA然後在strBindexBThe substrings to compare start in strA at indexA and in strB at indexB. 兩者indexAindexB之以零起始的是,也就是中的第一個字元strAstrB位在位置零。Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero. 第一個子字串的長度等於長度strAindexA再加 1。The length of the first substring is equal to the length of strA minus indexA plus one. 第二個的子字串長度會等於長度strBindexB再加 1。The length of the second substring is equal to the length of strB minus indexB plus one.

要比較的字元數是較小的兩個子字串,長度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length參數不可為負值。The indexA, indexB, and length parameters must be nonnegative.

比較會使用目前文化特性,若要取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字元的組合視為單一字元,或以特定的方式,比較大寫和小寫字元,可以指定文化特性或字元的排序順序取決於前面的字元,或跟隨它。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.

使用字組排序規則來進行比較。The comparison is performed using word sort rules. 如需有關字、 字串和序數排序的詳細資訊,請參閱System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

當比較字串,您應該呼叫Compare(String, Int32, String, Int32, Int32, StringComparison)方法,它會要求您明確指定此方法會使用的字串比較的型別。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. 如需詳細資訊,請參閱使用字串的最佳做法For more information, see Best Practices for Using Strings.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或兩個子字串都比較之後,將會結束比較。The comparison terminates when an inequality is discovered or both substrings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,然後其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32)方法執行語言或文化特性的比較時不會考慮這些字元。The Compare(String, Int32, String, Int32, Int32) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要識別可忽略的字元在比較中,呼叫Compare(String, Int32, String, Int32, Int32, StringComparison)方法,並提供的值OrdinalOrdinalIgnoreCasecomparisonType參數。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.

另請參閱

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)

比較兩個指定的 String 物件的子字串,使用指定的比較選項及特定文化特性資訊影響比較,然後傳回整數,這個整數表示這兩個子字串在排序次序中彼此的關聯性。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

參數

strA
String String String String

要用於比較中的第一個字串。The first string to use in the comparison.

indexA
Int32 Int32 Int32 Int32

strA 中子字串的開始位置。The starting position of the substring within strA.

strB
String String String String

要用於比較的第二個字串。The second string to use in the comparison.

indexB
Int32 Int32 Int32 Int32

strB 中子字串的開始位置。The starting position of the substring within strB.

length
Int32 Int32 Int32 Int32

要比較之子字串的字元數上限。The maximum number of characters in the substrings to compare.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

物件,提供文化特性相關的比較資訊。An object that supplies culture-specific comparison information.

options
CompareOptions CompareOptions CompareOptions CompareOptions

執行比較時要使用的選項 (例如忽略大小寫或符號)。Options to use when performing the comparison (such as ignoring case or symbols).

傳回

整數,這個整數表示兩個子字串之間的語彙關係,如下表所示。An integer that indicates the lexical relationship between the two substrings, as shown in the following table.

Value 條件Condition
小於零Less than zero strA 中的子字串的排序次序在 strB 中的子字串之前。The substring in strA precedes the substring in strB in the sort order.
Zero 子字串出現在排序次序中的相同位置,或 length 為零。The substrings occur in the same position in the sort order, or length is zero.
大於零Greater than zero strA 中的子字串的排序次序在 strB 中的子字串之後。The substring in strA follows the substring in strB in the sort order.

例外狀況

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

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

-或--or- indexAindexBlength 是負數。indexA, indexB, or length is negative.

-或--or- strAstrBnull,且 length 大於零。Either strA or strB is null, and length is greater than zero.

範例

下列範例會使用Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法來比較兩個人員的姓氏。The following example uses the Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method to compare the last names of two people. 然後它會列出它們依字母順序。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

備註

要比較之子字串開始strA位置處indexA然後在strB位置indexBThe substrings to compare start in strA at position indexA and in strB at position indexB. 第一個子字串的長度是長度strAindexAThe length of the first substring is the length of strA minus indexA. 第二個的子字串的長度是長度strBindexBThe length of the second substring is the length of strB minus indexB.

要比較的字元數是較小的兩個子字串,長度和lengthThe number of characters to compare is the lesser of the lengths of the two substrings, and length. indexAindexB,和length參數不可為負值。The indexA, indexB, and length parameters must be nonnegative.

比較使用culture參數來取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the culture parameter to obtain culture-specific information, such as casing rules and the alphabetical order of individual characters. 例如,某些字元的組合,視為單一字元、 大寫和小寫字元要比較以特定的方式,可以指定特定文化特性或字元的排序次序取決於字元,與其前面或後面。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.

警告

Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法主要針對用於排序或依字母順序排列的作業。The Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method is designed primarily for use in sorting or alphabetizing operations. 此外,它不應該使用時呼叫方法的主要目的是要判斷這兩個子字串是否相等 (也就是當方法呼叫的目的是要測試傳回的值為零)。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). 若要判斷兩個字串是否相等,請呼叫Equals方法。To determine whether two strings are equivalent, call the Equals method.

其中一個或多個strAstrB可以是nullOne or both of strA and strB can be null. 根據定義,任何字串,其中包括String.Empty,彼此相等比較大於 null 參考,且兩個 null 參考。By definition, any string, including String.Empty, compares greater than a null reference, and two null references compare equal to each other.

比較可以進一步指定options參數,其中包含一個或多個成員System.Globalization.CompareOptions列舉型別。The comparison can be further specified by the options parameter, which consists of one or more members of the System.Globalization.CompareOptions enumeration. 不過,這個方法的目的是要進行區分文化特性字串比較,因為CompareOptions.OrdinalCompareOptions.OrdinalIgnoreCase值沒有任何作用。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.

當探索到的不等比較,或兩個子字串都比較之後,將會結束比較。The comparison terminates when an inequality is discovered or both substrings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法執行語言或文化特性的比較時不會考慮這些字元。The Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. 若要識別可忽略的字元在比較中,提供的值Ordinal或是OrdinalIgnoreCaseoptions參數。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the options parameter.

另請參閱

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

比較兩個指定的 String 物件,忽略或區分兩者的大小寫,並使用特定文化特性資訊來影響比較,然後傳回一個整數,表示兩者在排序順序中的相對位置。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

參數

strA
String String String String

要比較的第一個字串。The first string to compare.

strB
String String String String

要比較的第二個字串。The second string to compare.

ignoreCase
Boolean Boolean Boolean Boolean

true 表示在比較時忽略大小寫,否則為 falsetrue to ignore case during the comparison; otherwise, false.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

物件,提供文化特性相關的比較資訊。An object that supplies culture-specific comparison information.

傳回

32 位元帶正負號的整數,表示兩個比較元之間的語彙關係。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero 在排序次序中,strA 會排在 strB 之前。strA precedes strB in the sort order.
Zero strA 出現在排序次序中的位置和 strB 相同。strA occurs in the same position as strB in the sort order.
大於零Greater than zero 在排序次序中,strA 會排在 strB 之後。strA follows strB in the sort order.

例外狀況

範例

下列範例示範文化特性如何影響比較。The following example demonstrates how culture can affect a comparison. 捷克文-捷克共和國文化特性,在 「 ch"會是單一字元,超過"d"。In Czech - Czech Republic culture, "ch" is a single character that is greater than "d". 不過,在英文-美國文化特性,"ch"所組成兩個字元,而且"c"小於"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
'

備註

比較使用culture參數來取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the culture parameter to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字元的組合視為單一字元,或以特定的方式,比較大寫和小寫字元,可以指定文化特性或字元的排序順序取決於前面的字元,或跟隨它。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.

使用字組排序規則來進行比較。The comparison is performed using word sort rules. 如需有關字、 字串和序數排序的詳細資訊,請參閱System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或這兩個字串都比較之後,就會結束比較。The comparison terminates when an inequality is discovered or both strings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,然後其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, String, Boolean, CultureInfo)方法執行區分文化特性比較時不會考慮這類字元。The Compare(String, String, Boolean, CultureInfo) method does not consider such characters when it performs a culture-sensitive comparison. 例如,如果執行下列程式碼.NET Framework 4.NET Framework 4或更新版本中,"animal"與"Ani-惡意程式 」 (使用選擇性連字號或 U + 00AD) 的不區分大小寫比較使用不區分文化特性會指出兩個字串相等。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] 若要識別可忽略的字元字串比較中,呼叫Compare(String, String, CultureInfo, CompareOptions)方法,並提供的值Ordinal或是OrdinalIgnoreCaseoptions參數。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.

另請參閱

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

使用指定的規則比較兩個指定的 String 物件,並傳回一個整數,表示兩者在排序順序中的相對位置。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

參數

strA
String String String String

要比較的第一個字串。The first string to compare.

strB
String String String String

要比較的第二個字串。The second string to compare.

comparisonType
StringComparison StringComparison StringComparison StringComparison

其中一個列舉值,指定要用於比較的規則。One of the enumeration values that specifies the rules to use in the comparison.

傳回

32 位元帶正負號的整數,表示兩個比較元之間的語彙關係。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero 在排序次序中,strA 會排在 strB 之前。strA precedes strB in the sort order.
Zero strA 在排序次序中的位置和 strB 相同。strA is in the same position as strB in the sort order.
大於零Greater than zero 在排序次序中,strA 會排在 strB 之後。strA follows strB in the sort order.

例外狀況

範例

下列範例會比較三個版本的字母"I"。The following example compares three versions of the letter "I". 文化特性、 是否忽略大小寫,以及是否執行序數比較的選擇會影響結果。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)
'

備註

comparisonType參數會指出是否比較應該使用目前或而異的文化特性,接受或忽略大小寫的比較元,或使用 word (區分文化特性) 或序數 (不區分文化特性) 的排序規則。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.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或這兩個字串都比較之後,就會結束比較。The comparison terminates when an inequality is discovered or both strings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, String, StringComparison)方法執行區分文化特性比較時不會考慮這類字元。The Compare(String, String, StringComparison) method does not consider such characters when it performs a culture-sensitive comparison. 若要識別可忽略的字元在比較中,提供的值Ordinal或是OrdinalIgnoreCasecomparisonType參數。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the comparisonType parameter.

另請參閱

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

比較兩個指定的 String 物件,忽略或區分兩者的大小寫,並傳回一個整數,表示兩者在排序順序中的相對位置。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

參數

strA
String String String String

要比較的第一個字串。The first string to compare.

strB
String String String String

要比較的第二個字串。The second string to compare.

ignoreCase
Boolean Boolean Boolean Boolean

true 表示在比較時忽略大小寫,否則為 falsetrue to ignore case during the comparison; otherwise, false.

傳回

32 位元帶正負號的整數,表示兩個比較元之間的語彙關係。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero 在排序次序中,strA 會排在 strB 之前。strA precedes strB in the sort order.
Zero strA 出現在排序次序中的位置和 strB 相同。strA occurs in the same position as strB in the sort order.
大於零Greater than zero 在排序次序中,strA 會排在 strB 之後。strA follows strB in the sort order.

範例

下列範例示範Compare(String, String, Boolean)方法就相當於使用ToUpperToLower比較字串時。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

備註

比較會使用目前文化特性,若要取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字元的組合視為單一字元,或以特定的方式,比較大寫和小寫字元,可以指定文化特性或字元的排序順序取決於前面的字元,或跟隨它。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.

使用字組排序規則來進行比較。The comparison is performed using word sort rules. 如需有關字、 字串和序數排序的詳細資訊,請參閱System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

當比較字串,您應該呼叫Compare(String, String, StringComparison)方法,它會要求您明確指定此方法會使用的字串比較的型別。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. 如需詳細資訊,請參閱使用字串的最佳做法For more information, see Best Practices for Using Strings.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或這兩個字串都比較之後,就會結束比較。The comparison terminates when an inequality is discovered or both strings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,然後其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, String, Boolean)方法執行區分文化特性比較時不會考慮這類字元。The Compare(String, String, Boolean) method does not consider such characters when it performs a culture-sensitive comparison. 例如,如果執行下列程式碼.NET Framework 4.NET Framework 4或更新版本中,區分文化特性、 不區分大小寫的比較"animal"與"Ani-惡意程式 」 (使用選擇性連字號或 U + 00AD) 表示兩個字串相等。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] 若要識別可忽略的字元字串比較中,呼叫Compare(String, String, StringComparison)方法,並提供的值Ordinal或是OrdinalIgnoreCasecomparisonType參數。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.

另請參閱

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

比較兩個指定的 String 物件,並傳回一個整數,指出它們在排序順序中的相對位置。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

參數

strA
String String String String

要比較的第一個字串。The first string to compare.

strB
String String String String

要比較的第二個字串。The second string to compare.

傳回

32 位元帶正負號的整數,表示兩個比較元之間的語彙關係。A 32-bit signed integer that indicates the lexical relationship between the two comparands.

Value 條件Condition
小於零Less than zero 在排序次序中,strA 會排在 strB 之前。strA precedes strB in the sort order.
Zero strA 出現在排序次序中的位置和 strB 相同。strA occurs in the same position as strB in the sort order.
大於零Greater than zero 在排序次序中,strA 會排在 strB 之後。strA follows strB in the sort order.

範例

下列範例會呼叫Compare(String, String)方法來比較三個集合的字串。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

在下列範例中,ReverseStringComparer類別會示範如何評估兩個字串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

備註

比較會使用目前文化特性,若要取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the current culture to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. 例如,某些字元的組合視為單一字元,或以特定的方式,比較大寫和小寫字元,可以指定文化特性或字元的排序順序取決於前面的字元,或跟隨它。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.

使用字組排序規則來進行比較。The comparison is performed using word sort rules. 如需有關字、 字串和序數排序的詳細資訊,請參閱System.Globalization.CompareOptionsFor more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

警告

當比較字串,您應該呼叫Compare(String, String, StringComparison)方法,它會要求您明確指定此方法會使用的字串比較的型別。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. 如需詳細資訊,請參閱使用字串的最佳做法For more information, see Best Practices for Using Strings.

一或兩個比較元可以是nullOne or both comparands can be null. 根據定義,任何字串,包括空字串 (""),為 null 的參考; 大於的比較並比較彼此相等的兩個 null 參考。By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

當探索到的不等比較,或這兩個字串都比較之後,就會結束比較。The comparison terminates when an inequality is discovered or both strings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,然後其餘字元的字串被視為較大。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. 傳回的值是執行的最後一個比對的結果。The return value is the result of the last comparison performed.

比較會受到特定文化特性的大小寫規則,就會發生非預期的結果。Unexpected results can occur when comparisons are affected by culture-specific casing rules. 例如,在土耳其文,下列範例會產生錯誤的結果因為土耳其文中的檔案系統不會使用語言大小寫規則,以找到字母"i"中 「 檔案 」。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

比較路徑名稱為"file"使用序數比較。Compare the path name to "file" using an ordinal comparison. 若要這樣做正確的程式碼如下所示: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

給呼叫者的注意事項

字元集包含可忽略的字元。Character sets include ignorable characters. Compare(String, String)方法執行區分文化特性比較時不會考慮這類字元。The Compare(String, String) method does not consider such characters when it performs a culture-sensitive comparison. 例如,如果執行下列程式碼.NET Framework 4.NET Framework 4或更新版本中,區分文化特性的比較"animal"與"ani-惡意程式 」 (使用選擇性連字號或 U + 00AD) 表示兩個字串相等。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] 若要識別可忽略的字元字串比較中,呼叫Compare(String, String, StringComparison)方法,並提供的值Ordinal或是OrdinalIgnoreCasecomparisonType參數。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.

另請參閱

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

比較兩個指定的 String 物件,使用指定的比較選項及特定文化特性資訊影響比較,然後傳回整數,這個整數表示這兩個字串在排序次序中彼此的關聯性。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

參數

strA
String String String String

要比較的第一個字串。The first string to compare.

strB
String String String String

要比較的第二個字串。The second string to compare.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

提供特定文化特性之比較資訊的文化特性。The culture that supplies culture-specific comparison information.

options
CompareOptions CompareOptions CompareOptions CompareOptions

執行比較時要使用的選項 (例如忽略大小寫或符號)。Options to use when performing the comparison (such as ignoring case or symbols).

傳回

32 位元帶正負號的整數,這個整數表示 strAstrB 之間的語彙關係,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 條件Condition
小於零Less than zero 在排序次序中,strA 會排在 strB 之前。strA precedes strB in the sort order.

Zero strA 出現在排序次序中的位置和 strB 相同。strA occurs in the same position as strB in the sort order.

大於零Greater than zero 在排序次序中,strA 會排在 strB 之後。strA follows strB in the sort order.

例外狀況

範例

下列範例會比較兩個字串中有三種: 使用 EN-US 文化特性; 的語言比較會使用 EN-US 文化特性; 語言區分大小寫的比較並使用序數比較。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. 它會說明如何比較的三種方法會產生三個不同的結果。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'.

備註

比較使用culture參數來取得特定文化特性資訊,例如大小寫規則和個別字元的字母順序。The comparison uses the culture parameter to obtain culture-specific information, such as casing rules and the alphabetical order of individual characters. 例如,某些字元的組合,視為單一字元、 大寫和小寫字元要比較以特定的方式,可以指定特定文化特性或字元的排序次序取決於字元,與其前面或後面。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.

警告

Compare(String, String, CultureInfo, CompareOptions)方法主要針對用於排序或依字母順序排列的作業。The Compare(String, String, CultureInfo, CompareOptions) method is designed primarily for use in sorting or alphabetizing operations. 此外,它不應該使用時呼叫方法的主要目的是要判斷兩個字串是否相等 (也就是當方法呼叫的目的是要測試傳回的值為零)。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). 若要判斷兩個字串是否相等,請呼叫Equals方法。To determine whether two strings are equivalent, call the Equals method.

比較可以進一步指定options參數,其中包含一個或多個成員CompareOptions列舉型別。The comparison can be further specified by the options parameter, which consists of one or more members of the CompareOptions enumeration. 不過,這個方法的目的是要進行區分文化特性字串比較,因為CompareOptions.OrdinalCompareOptions.OrdinalIgnoreCase值沒有任何作用。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.

可以是任一個或兩個比較元nullEither or both comparands can be null. 根據定義,任何字串,其中包括String.Empty,彼此相等比較大於 null 參考,且兩個 null 參考。By definition, any string, including String.Empty, compares greater than a null reference, and two null references compare equal to each other.

當探索到的不等比較,或這兩個字串都比較之後,就會結束比較。The comparison terminates when an inequality is discovered or both strings have been compared. 不過,如果兩個字串比較等於一個字串的結尾,而另一個字串有多餘的字元,其餘字元的字串被視為較大。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.

給呼叫者的注意事項

字元集包含可忽略的字元,這些字元在執行語言或區分文化特性的比較時不列入考慮。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)方法執行區分文化特性比較時不會考慮這類字元。The Compare(String, String, CultureInfo, CompareOptions) method does not consider such characters when it performs a culture-sensitive comparison. 若要識別可忽略的字元在比較中,提供的值Ordinal或是OrdinalIgnoreCaseoptions參數。To recognize ignorable characters in your comparison, supply a value of Ordinal or OrdinalIgnoreCase for the options parameter.

另請參閱

適用於