String.Compare 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
比較兩個指定的 String 物件,並傳回整數,指出它們在排序順序中的相對位置。
多載
備註
Compare 方法的所有多載都會傳回 32 位帶正負號的整數,指出兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 | 第一個子字串在排序順序中的第二個子字串之前。 |
零 | 子字串會以排序順序中的相同位置發生,或 length 為零。 |
大於零 | 第一個子字串會遵循排序順序中的第二個子字串。 |
警告
盡可能呼叫包含 StringComparison 參數的 Compare 方法多載。 如需詳細資訊,請參閱 使用字串的最佳作法。
Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)
使用指定的比較選項和文化特性特定資訊來比較兩個指定 String 物件的子字串,並傳回整數,指出兩個子字串在排序順序中彼此的關聯性。
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);
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
要用於比較的第一個字串。
- indexA
- Int32
子字串在 strA
內的起始位置。
- strB
- String
要用於比較的第二個字串。
- indexB
- Int32
子字串在 strB
內的起始位置。
- length
- Int32
要比較之子字串中的字元數上限。
- culture
- CultureInfo
物件,提供特定文化特性的比較資訊。 如果 culture
是 null
,則會使用目前的文化特性。
- options
- CompareOptions
執行比較時要使用的選項(例如忽略大小寫或符號)。
傳回
整數,表示兩個子字串之間的語匯關聯性,如下表所示。
價值 | 條件 |
---|---|
小於零 |
strA 中的子字串在排序順序中 strB 中的子字串之前。
|
零 | 子字串會以排序順序中的相同位置發生,或 length 為零。
|
大於零 |
strA 中的子字串會遵循排序順序中 strB 中的子字串。
|
例外狀況
options
不是 CompareOptions 值。
indexA
大於 strA
.Length
。
-或-
indexB
大於 strB
.Length
。
-或-
indexA
、indexB
或 length
為負數。
-或-
strA
或 strB
為 null
,且 length
大於零。
範例
下列範例會使用 Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 方法來比較兩人的姓氏。 然後,它會依字母順序列出它們。
string name1 = "Jack Smith";
string name2 = "John Doe";
// Get position of character after the space character.
int index1 = name1.IndexOf(" ");
index1 = index1 < 0 ? 0 : ++index1;
int index2 = name2.IndexOf(" ");
index2 = index2 < 0 ? 0 : ++index2;
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
open System
open System.Globalization
let name1 = "Jack Smith"
let name2 = "John Doe"
// Get position of character after the space character.
let index1 =
let i = name1.IndexOf " "
if i < 0 then 0 else i + 1
let index2 =
let i = name2.IndexOf " "
if i < 0 then 0 else i + 1
let length = max name1.Length name2.Length
printfn "Sorted alphabetically by last name:"
if String.Compare(name1, index1, name2, index2, length, CultureInfo "en-US", CompareOptions.IgnoreCase) < 0 then
printfn $"{name1}\n{name2}"
else
printfn $"{name2}\n{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 strA
位置 indexA
和位置位置 strB
indexB
的子字串。 第一個子字串的長度是 strA
減 indexA
長度。 第二個子字串的長度是 strB
減 indexB
的長度。
要比較的字元數是兩個子字串長度的較小,且 length
。
indexA
、indexB
和 length
參數必須是非負值。
比較會使用 culture
參數來取得特定文化特性的資訊,例如大小寫規則和個別字元的字母順序。 例如,特定文化特性可以指定將特定字元組合視為單一字元、以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟著字元的字元。
謹慎
Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 方法的設計主要是用於排序或字母順序作業。 當方法呼叫的主要目的是判斷兩個子字串是否相等時,就不應該使用它(也就是說,當方法呼叫的目的是測試傳回值為零時)。 若要判斷兩個字串是否相等,請呼叫 Equals 方法。
strA
與 strB
的一或兩者都可以 null
。 根據定義,任何字串,包括 String.Empty,會比較大於 null 參考,而兩個 null 參考會彼此比較相等。
比較可由 options
參數進一步指定,該參數是由 System.Globalization.CompareOptions 列舉的一或多個成員所組成。 不過,由於此方法的目的是進行區分文化特性的字串比較,因此 CompareOptions.Ordinal 和 CompareOptions.OrdinalIgnoreCase 值沒有任何作用。
當發現不等比較或兩個子字串都已比較時,比較就會終止。 不過,如果兩個字串比較等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
給呼叫者的注意事項
字元集包含可忽略的字元。
Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 方法在執行語言或區分文化特性的比較時,不會考慮這些字元。 若要辨識比較中可忽略的字元,請為 options
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
比較兩個指定 String 物件的子字串、忽略或接受其大小寫,以及使用特定文化特性資訊來影響比較,並傳回整數,指出其在排序順序中的相對位置。
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);
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
要用於比較的第一個字串。
- indexA
- Int32
子字串在 strA
中的位置。
- strB
- String
要用於比較的第二個字串。
- indexB
- Int32
子字串在 strB
中的位置。
- length
- Int32
要比較之子字串中的字元數上限。
- ignoreCase
- Boolean
true
比較期間忽略大小寫;否則,false
。
- culture
- CultureInfo
物件,提供特定文化特性的比較資訊。 如果 culture
是 null
,則會使用目前的文化特性。
傳回
整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 中的子字串在排序順序中 strB 中的子字串之前。
|
零 | 子字串會以排序順序中的相同位置發生,或 length 為零。
|
大於零 |
strA 中的子字串會遵循排序順序中 strB 中的子字串。
|
例外狀況
indexA
大於 strA
。Length。
-或-
indexB
大於 strB
。Length。
-或-
indexA
、indexB
或 length
為負數。
-或-
strA
或 strB
為 null
,且 length
大於零。
範例
下列範例會使用不同的文化特性比較兩個子字串,並忽略子字串的案例。 文化選擇會影響字母 「I」 的比較方式。
// 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 Sample5
{
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)
open System
open System.Globalization
// 0123456
let str1 = "MACHINE"
let str2 = "machine"
printfn $"\nstr1 = '{str1}', str2 = '{str2}'"
printfn "Ignore case, Turkish culture:"
let result = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo "tr-TR")
let str = if result < 0 then "less than" elif result > 0 then "greater than" else "equal to"
printf $"Substring '{str1.Substring(4, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(4, 2)}' in '{str2}'."
printfn "\nIgnore case, invariant culture:"
let result2 = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo.InvariantCulture)
let str3 = if result < 0 then "less than" elif result > 0 then "greater than" else "equal to"
printf $"Substring '{str1.Substring(4, 2)}' in '{str1}' is "
printf $"{str3} "
printfn $"substring '{str2.Substring(4, 2)}' in '{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.Globalization
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
End Class
'
'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 strA
indexA
的子字串,以及 strB
indexB
。
indexA
和 indexB
都是以零起始的;也就是說,strA
和 strB
中的第一個字元位於位置零,而不是第一個位置。 第一個子字串的長度等於 strA
減 indexA
加一。 第二個子字串的長度等於 strB
減 indexB
加一。
要比較的字元數是兩個子字串長度的較小,且 length
。
indexA
、indexB
和 length
參數必須是非負值。
比較會使用 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。 例如,文化特性可以指定將字元的特定組合視為單一字元,或以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟隨字元的字元。
比較是使用文字排序規則來執行。 如需文字、字串和序數排序的詳細資訊,請參閱 System.Globalization.CompareOptions。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當發現不等比較或兩個子字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。
Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) 方法在執行語言或區分文化特性的比較時,不會考慮這些字元。 若要辨識比較中可忽略的字元,請呼叫 Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 方法,併為 options
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, Int32, String, Int32, Int32, StringComparison)
使用指定的規則比較兩個指定 String 物件的子字串,並傳回整數,指出其在排序順序中的相對位置。
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);
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
要用於比較的第一個字串。
- indexA
- Int32
子字串在 strA
中的位置。
- strB
- String
要用於比較的第二個字串。
- indexB
- Int32
子字串在 strB
中的位置。
- length
- Int32
要比較之子字串中的字元數上限。
- comparisonType
- StringComparison
其中一個列舉值,指定要用於比較的規則。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 中的子字串在排序順序中 strB 中的子字串之前。
|
零 | 子字串會以排序順序中的相同位置發生,或 length 參數為零。
|
大於零 |
strA 中的子字串會遵循排序順序中 strB 中的子字串。
|
例外狀況
indexA
大於 strA
。Length。
-或-
indexB
大於 strB
。Length。
-或-
indexA
、indexB
或 length
為負數。
-或-
indexA
或 indexB
為 null
,且 length
大於零。
comparisonType
不是 StringComparison 值。
範例
下列範例會比較兩個子字串。
// 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'.
*/
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'.
*/
open System
let str1 = "machine"
let str2 = "device"
printfn "\nstr1 = '{str1}', str2 = '{str2}'"
let result = String.Compare(str1, 2, str2, 0, 2)
let str =
if result < 0 then "less than"
elif result > 0 then "greater than"
else "equal to"
printf $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(0, 2)}' in '{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)
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
End Class
'
'This example produces the following results:
'
'str1 = 'machine', str2 = 'device'
'Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
'
備註
要比較在 indexA
strA
和 strB
indexB
中開始比較的子字串。
indexA
和 indexB
都是以零起始的;也就是說,strA
和 strB
中的第一個字元位於位置零,而不是第一個位置。 第一個子字串的長度等於 strA
減 indexA
加一。 第二個子字串的長度等於 strB
減 indexB
加一。
要比較的字元數是兩個子字串長度的較小,且 length
。
indexA
、indexB
和 length
參數必須是非負值。
comparisonType
參數會指出比較是否應該使用目前或不因文化特性而異的文化特性、接受或忽略比較子的案例,或使用文字(區分文化特性)或序數(不區分文化特性)排序規則。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當發現不等比較或兩個子字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。
Compare(String, Int32, String, Int32, Int32, StringComparison) 方法在執行語言或區分文化特性的比較時,不會考慮這些字元。 若要辨識比較中可忽略的字元,請為 comparisonType
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, Int32, String, Int32, Int32, Boolean)
比較兩個指定之 String 物件的子字串、忽略或接受其大小寫,並傳回整數,指出其在排序順序中的相對位置。
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);
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
要用於比較的第一個字串。
- indexA
- Int32
子字串在 strA
中的位置。
- strB
- String
要用於比較的第二個字串。
- indexB
- Int32
子字串在 strB
中的位置。
- length
- Int32
要比較之子字串中的字元數上限。
- ignoreCase
- Boolean
true
比較期間忽略大小寫;否則,false
。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 中的子字串在排序順序中 strB 中的子字串之前。
|
零 | 子字串會以排序順序中的相同位置發生,或 length 為零。
|
大於零 |
strA 中的子字串會遵循排序順序中 strB 中的子字串。
|
例外狀況
indexA
大於 strA
。Length。
-或-
indexB
大於 strB
。Length。
-或-
indexA
、indexB
或 length
為負數。
-或-
indexA
或 indexB
為 null
,且 length
大於零。
範例
下列範例會執行兩個只區分大小寫的兩個子字串比較。 第一個比較會忽略大小寫,而第二個比較會考慮大小寫。
// 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'.
*/
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'.
*/
open System
let str1 = "MACHINE"
let str2 = "machine"
printfn $"\nstr1 = '{str1}', str2 = '{str2}'"
printfn "Ignore case:"
let result = String.Compare(str1, 2, str2, 2, 2, true)
let str =
if result < 0 then "less than"
elif result > 0 then "greater than"
else "equal to"
printf $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(2, 2)}' in '{str2}'.\n"
printfn "Honor case:"
let result2 = String.Compare(str1, 2, str2, 2, 2, false)
let str3 =
if result < 0 then "less than"
elif result > 0 then "greater than"
else "equal to"
printfn $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str3} "
printfn $"substring '{str2.Substring(2, 2)}' in '{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)
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
End Class
'
'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 strA
indexA
的子字串,以及 strB
indexB
。
indexA
和 indexB
都是以零起始的;也就是說,strA
中的第一個字元,而 strB
位在零。 第一個子字串的長度等於 strA
減 indexA
加一。 第二個子字串的長度等於 strB
減 indexB
加一。
要比較的字元數是兩個子字串長度的較小,且 length
。
indexA
、indexB
和 length
參數必須是非負值。
比較會使用目前的文化特性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。 例如,文化特性可以指定將字元的特定組合視為單一字元,或以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟隨字元的字元。
比較是使用文字排序規則來執行。 如需文字、字串和序數排序的詳細資訊,請參閱 System.Globalization.CompareOptions。
警告
比較字串時,您應該呼叫 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法,這需要您明確指定方法所使用的字串比較類型。 如需詳細資訊,請參閱 使用字串的最佳作法。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當發現不等比較或兩個子字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
路徑名稱必須以不因應的方式進行比較。 執行此動作的正確程序代碼如下所示。
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);
}
let isFileURI path =
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。
Compare(String, Int32, String, Int32, Int32, Boolean) 方法在執行語言或區分文化特性的比較時,不會考慮這些字元。 若要辨識比較中可忽略的字元,請呼叫 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法,併為 comparisonType
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, Int32, String, Int32, Int32)
比較兩個指定之 String 物件的子字串,並傳回整數,指出其在排序順序中的相對位置。
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);
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
要用於比較的第一個字串。
- indexA
- Int32
子字串在 strA
中的位置。
- strB
- String
要用於比較的第二個字串。
- indexB
- Int32
子字串在 strB
中的位置。
- length
- Int32
要比較之子字串中的字元數上限。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 中的子字串在排序順序中 strB 中的子字串之前。
|
零 | 子字串會以排序順序中的相同位置發生,或 length 為零。
|
大於零 |
strA 中的子字串會遵循排序順序中 strB 中的子字串。
|
例外狀況
indexA
大於 strA
。Length。
-或-
indexB
大於 strB
。Length。
-或-
indexA
、indexB
或 length
為負數。
-或-
indexA
或 indexB
為 null
,且 length
大於零。
範例
下列範例會比較兩個子字串。
// 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'.
*/
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'.
*/
open System
let str1 = "machine"
let str2 = "device"
printfn "\nstr1 = '{str1}', str2 = '{str2}'"
let result = String.Compare(str1, 2, str2, 0, 2)
let str =
if result < 0 then "less than"
elif result > 0 then "greater than"
else "equal to"
printf $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(0, 2)}' in '{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)
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
End Class
'
'This example produces the following results:
'
'str1 = 'machine', str2 = 'device'
'Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
'
備註
要比較在 indexA
strA
和 strB
indexB
中開始比較的子字串。
indexA
和 indexB
都是以零起始的;也就是說,strA
中的第一個字元,而 strB
位在零。 第一個子字串的長度等於 strA
減 indexA
加一。 第二個子字串的長度等於 strB
減 indexB
加一。
要比較的字元數是兩個子字串長度的較小,且 length
。
indexA
、indexB
和 length
參數必須是非負值。
比較會使用目前的文化特性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。 例如,文化特性可以指定將字元的特定組合視為單一字元,或以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟隨字元的字元。
比較是使用文字排序規則來執行。 如需文字、字串和序數排序的詳細資訊,請參閱 System.Globalization.CompareOptions。
警告
比較字串時,您應該呼叫 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法,這需要您明確指定方法所使用的字串比較類型。 如需詳細資訊,請參閱 使用字串的最佳作法。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當發現不等比較或兩個子字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。
Compare(String, Int32, String, Int32, Int32) 方法在執行語言或區分文化特性的比較時,不會考慮這些字元。 若要辨識比較中可忽略的字元,請呼叫 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法,併為 comparisonType
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, String, CultureInfo, CompareOptions)
使用指定的比較選項和文化特性特定資訊來比較兩個指定的 String 物件,以影響比較,並傳回整數,指出兩個字元串在排序順序中彼此的關聯性。
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);
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
要比較的第一個字串。
- strB
- String
要比較的第二個字串。
- culture
- CultureInfo
提供特定文化特性比較資訊的文化特性。 如果 culture
是 null
,則會使用目前的文化特性。
- options
- CompareOptions
執行比較時要使用的選項(例如忽略大小寫或符號)。
傳回
32 位帶正負號的整數,表示 strA
與 strB
之間的語彙關聯性,如下表所示
價值 | 條件 |
---|---|
小於零 |
strA 在排序順序中 strB 之前。
|
零 |
strA 的發生位置與排序順序中的 strB 相同。
|
大於零 |
strA 依排序順序遵循 strB 。
|
例外狀況
options
不是 CompareOptions 值。
範例
下列範例會以三種不同的方式比較兩個字元串:針對 en-US 文化特性使用語言比較;使用 en-US 文化特性的語言區分大小寫比較;並使用序數比較。 它說明三種比較方法如何產生三個不同的結果。
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 Example0
{
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'.
}
}
open System
open System.Globalization
let string1 = "brother"
let string2 = "Brother"
// Cultural (linguistic) comparison.
let result = String.Compare(string1, string2, CultureInfo "en-US", CompareOptions.None)
let relation =
if result > 0 then "comes after"
elif result = 0 then "is the same as"
else "comes before"
printfn $"'{string1}' {relation} '{string2}'."
// Cultural (linguistic) case-insensitive comparison.
let result2 = String.Compare(string1, string2, CultureInfo "en-US", CompareOptions.IgnoreCase)
let relation2 =
if result2 > 0 then "comes after"
elif result2 = 0 then "is the same as"
else "comes before"
printfn $"'{string1}' {relation2} '{string2}'."
// Culture-insensitive ordinal comparison.
let result3 = String.CompareOrdinal(string1, string2)
let relation3 =
if result2 > 0 then "comes after"
elif result2 = 0 then "is the same as"
else "comes before"
printfn $"'{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
比較會使用 culture
參數來取得特定文化特性的資訊,例如大小寫規則和個別字元的字母順序。 例如,特定文化特性可以指定將特定字元組合視為單一字元、以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟著字元的字元。
謹慎
Compare(String, String, CultureInfo, CompareOptions) 方法的設計主要是用於排序或字母順序作業。 當方法呼叫的主要目的是判斷兩個字串是否相等時,就不應該使用它(也就是說,當方法呼叫的目的是測試傳回值為零時)。 若要判斷兩個字串是否相等,請呼叫 Equals 方法。
比較可由 options
參數進一步指定,該參數是由 CompareOptions 列舉的一或多個成員所組成。 不過,由於此方法的目的是進行區分文化特性的字串比較,因此 CompareOptions.Ordinal 和 CompareOptions.OrdinalIgnoreCase 值沒有任何作用。
或兩個比較子都可以 null
。 根據定義,任何字串,包括 String.Empty,會比較大於 null 參考,而兩個 null 參考會彼此比較相等。
當探索到不等比較或兩個字串都已比較時,比較就會終止。 不過,如果兩個字串比較等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。
給呼叫者的注意事項
字元集包含可忽略的字元,這些字元是執行語言或區分文化特性的比較時不會考慮的字元。
Compare(String, String, CultureInfo, CompareOptions) 方法在執行區分文化特性的比較時,不會考慮這類字元。 若要辨識比較中可忽略的字元,請為 options
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, String, Boolean, CultureInfo)
比較兩個指定的 String 物件、忽略或接受其大小寫,以及使用特定文化特性資訊來影響比較,並傳回整數,指出其在排序順序中的相對位置。
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);
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
要比較的第一個字串。
- strB
- String
要比較的第二個字串。
- ignoreCase
- Boolean
true
比較期間忽略大小寫;否則,false
。
- culture
- CultureInfo
物件,提供特定文化特性的比較資訊。 如果 culture
是 null
,則會使用目前的文化特性。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 在排序順序中 strB 之前。
|
零 |
strA 的發生位置與排序順序中的 strB 相同。
|
大於零 |
strA 依排序順序遵循 strB 。
|
範例
下列範例示範文化特性如何影響比較。 在捷克文化中,“ch” 是大於 “d” 的單一字元。 不過,在英文 - 美國文化中,“ch” 由兩個字元組成,而 “c” 小於 “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
*/
public static void Main()
{
String str1 = "change";
String str2 = "dollar";
String relation;
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
*/
let symbol r =
if r < 0 then "<"
elif r > 0 then ">"
else "="
let str1 = "change"
let str2 = "dollar"
let relation1 =
String.Compare(str1, str2, false, CultureInfo "en-US")
|> symbol
printfn $"For en-US: {str1} {relation1} {str2}"
let relation2 =
String.Compare(str1, str2, false, CultureInfo "cs-CZ")
|> symbol
printfn $"For cs-CZ: {str1} {relation2} {str2}"
(*
This example produces the following results.
For en-US: change < dollar
For cs-CZ: change > dollar
*)
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
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
'
'This example produces the following results.
'For en-US: change < dollar
'For cs-CZ: change > dollar
'
備註
比較會使用 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。 例如,文化特性可以指定將字元的特定組合視為單一字元,或以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟隨字元的字元。
比較是使用文字排序規則來執行。 如需文字、字串和序數排序的詳細資訊,請參閱 System.Globalization.CompareOptions。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當探索到不等比較或兩個字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。 Compare(String, String, Boolean, CultureInfo) 方法在執行區分文化特性的比較時,不會考慮這類字元。 例如,如果下列程式代碼是在 .NET Framework 4 或更新版本上執行,則使用不變異文化特性的 “animal” 與 “Ani-mal” (使用軟連字元或 U+00AD) 的不區分大小寫比較表示這兩個字符串相等。
string s1 = "Ani\u00ADmal";
string s2 = "animal";
Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
s1, s2, String.Compare(s1, s2, true,
CultureInfo.InvariantCulture));
// The example displays the following output:
// Comparison of 'Ani-mal' and 'animal': 0
open System
open System.Globalization
let s1 = "Ani\u00ADmal"
let s2 = "animal"
printfn $"Comparison of '{s1}' and '{s2}': {String.Compare(s1, s2, true, CultureInfo.InvariantCulture)}"
// The example displays the following output:
// Comparison of 'Ani-mal' and 'animal': 0
Imports System.Globalization
Module Example
Public Sub Main()
Dim s1 As String = "Ani" + ChrW(&h00AD) + "mal"
Dim s2 As String = "animal"
Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
s1, s2, String.Compare(s1, s2, True,
CultureInfo.InvariantCulture))
End Sub
End Module
' The example displays the following output:
' Comparison of 'ani-mal' and 'animal': 0
若要辨識字串比較中可忽略的字元,請呼叫 Compare(String, String, CultureInfo, CompareOptions) 方法,並提供 options
參數的 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
- Int32
- CompareOrdinal(String, String)
- CompareTo(Object)
- IsPrefix(String, String, CompareOptions)
- Boolean
適用於
Compare(String, String, StringComparison)
使用指定的規則比較兩個指定的 String 物件,並傳回整數,指出其排序順序中的相對位置。
public:
static int Compare(System::String ^ strA, System::String ^ strB, StringComparison comparisonType);
public static int Compare (string strA, 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
要比較的第一個字串。
- strB
- String
要比較的第二個字串。
- comparisonType
- StringComparison
其中一個列舉值,指定要用於比較的規則。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 在排序順序中 strB 之前。
|
零 |
strA 與排序順序中的 strB 位置相同。
|
大於零 |
strA 依排序順序遵循 strB 。
|
例外狀況
comparisonType
不是 StringComparison 值。
範例
下列範例會比較字母 「I」 的三個版本。 結果會受到文化特性選擇的影響、是否忽略大小寫,以及是否執行序數比較。
// 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.
open System
open System.Threading
let test x y (comparison: StringComparison) (testI: string[]) (testNames: string[]) =
let cmpValue = String.Compare(testI[x], testI[y], comparison)
let result =
if cmpValue < 0 then
"less than"
elif cmpValue > 0 then
"greater than"
else
"equal to"
printfn $"{testNames[x]} is {result} {testNames[y]}"
let 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.)
let threeIs =
[|// LATIN SMALL LETTER I (U+0069)
"\u0069"
// LATIN SMALL LETTER DOTLESS I (U+0131)
"\u0131"
// LATIN CAPITAL LETTER I (U+0049)
"\u0049" |]
let unicodeNames =
[| "LATIN SMALL LETTER I (U+0069)"
"LATIN SMALL LETTER DOTLESS I (U+0131)"
"LATIN CAPITAL LETTER I (U+0049)" |]
let scValues =
[| StringComparison.CurrentCulture
StringComparison.CurrentCultureIgnoreCase
StringComparison.InvariantCulture
StringComparison.InvariantCultureIgnoreCase
StringComparison.Ordinal
StringComparison.OrdinalIgnoreCase |]
Console.Clear()
printfn $"{intro}"
// Display the current culture because the culture-specific comparisons
// can produce different results with different cultures.
printfn $"The current culture is {Thread.CurrentThread.CurrentCulture.Name}.\n"
// Determine the relative sort order of three versions of the letter I.
for sc in scValues do
printfn $"StringComparison.{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
printfn ""
(*
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.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
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
End Class
'
'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
參數會指出比較是否應該使用目前或不因文化特性而異的文化特性、接受或忽略比較子的案例,或使用文字(區分文化特性)或序數(不區分文化特性)排序規則。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當探索到不等比較或兩個字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。
Compare(String, String, StringComparison) 方法在執行區分文化特性的比較時,不會考慮這類字元。 若要辨識比較中可忽略的字元,請為 comparisonType
參數提供 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, String, Boolean)
比較兩個指定的 String 物件,忽略或接受其大小寫,並傳回整數,指出其在排序順序中的相對位置。
public:
static int Compare(System::String ^ strA, System::String ^ strB, bool ignoreCase);
public static int Compare (string strA, 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
要比較的第一個字串。
- strB
- String
要比較的第二個字串。
- ignoreCase
- Boolean
true
比較期間忽略大小寫;否則,false
。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 在排序順序中 strB 之前。
|
零 |
strA 的發生位置與排序順序中的 strB 相同。
|
大於零 |
strA 依排序順序遵循 strB 。
|
範例
下列範例示範在比較字串時,Compare(String, String, Boolean) 方法相當於使用 ToUpper 或 ToLower。
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
// 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
open System
// Create upper-case characters from their Unicode code units.
let stringUpper = "\x0041\x0042\x0043"
// Create lower-case characters from their Unicode code units.
let stringLower = "\x0061\x0062\x0063"
// Display the strings.
printfn $"Comparing '{stringUpper}' and '{stringLower}':"
// Compare the uppercased strings the result is true.
printfn $"The Strings are equal when capitalized? %b{String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0}"
// The previous method call is equivalent to this Compare method, which ignores case.
printfn $"The Strings are equal when case is ignored? %b{String.Compare(stringUpper, stringLower, true) = 0}"
// 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
比較會使用目前的文化特性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。 例如,文化特性可以指定將字元的特定組合視為單一字元,或以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟隨字元的字元。
比較是使用文字排序規則來執行。 如需文字、字串和序數排序的詳細資訊,請參閱 System.Globalization.CompareOptions。
警告
比較字串時,您應該呼叫 Compare(String, String, StringComparison) 方法,這需要您明確指定方法所使用的字串比較類型。 如需詳細資訊,請參閱 使用字串的最佳作法。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當探索到不等比較或兩個字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。 Compare(String, String, Boolean) 方法在執行區分文化特性的比較時,不會考慮這類字元。 例如,區分文化特性且不區分大小寫的“animal” 與 “Ani-mal” 比較 (使用軟連字元或 U+00AD) 表示這兩個字符串相等。
string s1 = "Ani\u00ADmal";
string s2 = "animal";
Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
s1, s2, String.Compare(s1, s2, true));
// The example displays the following output:
// Comparison of 'Ani-mal' and 'animal': 0
open System
let s1 = "Ani\u00ADmal"
let s2 = "animal"
printfn $"Comparison of '{s1}' and '{s2}': {String.Compare(s1, s2, true)}"
// The example displays the following output:
// Comparison of 'Ani-mal' and 'animal': 0
Module Example
Public Sub Main()
Dim s1 As String = "Ani" + ChrW(&h00AD) + "mal"
Dim s2 As String = "animal"
Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
s1, s2, String.Compare(s1, s2, True))
End Sub
End Module
' The example displays the following output:
' Comparison of 'ani-mal' and 'animal': 0
若要辨識字串比較中可忽略的字元,請呼叫 Compare(String, String, StringComparison) 方法,並提供 comparisonType
參數的 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
Compare(String, String)
比較兩個指定的 String 物件,並傳回整數,指出它們在排序順序中的相對位置。
public:
static int Compare(System::String ^ strA, System::String ^ strB);
public static int Compare (string strA, 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
要比較的第一個字串。
- strB
- String
要比較的第二個字串。
傳回
32 位帶正負號的整數,表示兩個比較子之間的語匯關聯性。
價值 | 條件 |
---|---|
小於零 |
strA 在排序順序中 strB 之前。
|
零 |
strA 的發生位置與排序順序中的 strB 相同。
|
大於零 |
strA 依排序順序遵循 strB 。
|
範例
下列範例會呼叫 Compare(String, String) 方法來比較三組字串。
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
// 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
open System
// Create upper-case characters from their Unicode code units.
let stringUpper = "\x0041\x0042\x0043"
// Create lower-case characters from their Unicode code units.
let stringLower = "\x0061\x0062\x0063"
// Display the strings.
printfn $"Comparing '{stringUpper}' and '{stringLower}':"
// Compare the uppercased strings the result is true.
printfn $"The Strings are equal when capitalized? %b{String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0}"
// The previous method call is equivalent to this Compare method, which ignores case.
printfn $"The Strings are equal when case is ignored? %b{String.Compare(stringUpper, stringLower, true) = 0}"
// 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
類別示範如何使用 Compare 方法評估兩個字元串。
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);
}
}
open System
open System.Text
open System.Collections.Generic
type ReverseStringComparer() =
interface IComparer<string> with
member _.Compare(x, y) =
-String.Compare(x, y)
let printValues title (myList: #seq<string>) =
printf $"{title,10}: "
let sb = StringBuilder()
for s in myList do
sb.Append $"{s}, " |> ignore
sb.Remove(sb.Length - 2, 2) |> ignore
printfn $"{sb}"
// Creates and initializes a new ResizeArray.
let myAL = ResizeArray()
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.
printfn $"Count: {myAL.Count}"
printValues "Unsorted" myAL
myAL.Sort()
printValues "Sorted" myAL
myAL.Sort(ReverseStringComparer())
printValues "Reverse" myAL
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
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
End Class
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
備註
比較會使用目前的文化特性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。 例如,文化特性可以指定將字元的特定組合視為單一字元,或以特定方式比較大寫和小寫字元,或字元的排序順序取決於前面或跟隨字元的字元。
比較是使用文字排序規則來執行。 如需文字、字串和序數排序的詳細資訊,請參閱 System.Globalization.CompareOptions。
警告
比較字串時,您應該呼叫 Compare(String, String, StringComparison) 方法,這需要您明確指定方法所使用的字串比較類型。 如需詳細資訊,請參閱 使用字串的最佳作法。
一或兩個比較子都可以 null
。 根據定義,任何字串,包括空字串 (“”),會比較大於 Null 參考;和兩個 Null 參考彼此比較相等。
當探索到不等比較或兩個字串都已比較時,比較就會終止。 不過,如果兩個字串相等於一個字串的結尾,而另一個字元串有剩餘的字元,則會將剩餘字元的字串視為更大。 傳回值是上次執行的比較結果。
當比較受到特定文化特性大小寫規則的影響時,可能會發生非預期的結果。 例如,在土耳其文中,下列範例會產生錯誤的結果,因為土耳其文中的文件系統不會針對 「file」 中的字母 「i」 使用語言大小寫規則。
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);
}
let isFileURI path =
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
使用序數比較來比較路徑名稱與 「file」。 執行此動作的正確程式代碼如下所示:
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);
}
let isFileURI path =
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。 Compare(String, String) 方法在執行區分文化特性的比較時,不會考慮這類字元。 例如,如果下列程式代碼是在 .NET Framework 4 或更新版本上執行,則區分文化特性的 “animal” 與 “ani-mal” 比較 (使用軟連字元或 U+00AD) 表示這兩個字符串相等。
string s1 = "ani\u00ADmal";
string s2 = "animal";
Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
s1, s2, String.Compare(s1, s2));
// The example displays the following output:
// Comparison of 'ani-mal' and 'animal': 0
open System
let s1 = "ani\u00ADmal"
let s2 = "animal"
printfn $"Comparison of '{s1}' and '{s2}': {String.Compare(s1, s2)}"
// The example displays the following output:
// Comparison of 'ani-mal' and 'animal': 0
Module Example
Public Sub Main()
Dim s1 As String = "ani" + ChrW(&h00AD) + "mal"
Dim s2 As String = "animal"
Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
s1, s2, String.Compare(s1, s2))
End Sub
End Module
' The example displays the following output:
' Comparison of 'ani-mal' and 'animal': 0
若要辨識字串比較中可忽略的字元,請呼叫 Compare(String, String, StringComparison) 方法,並提供 comparisonType
參數的 Ordinal 或 OrdinalIgnoreCase 值。
另請參閱
適用於
意見反應
https://aka.ms/ContentUserFeedback。
即將登場:在 2024 年,我們將逐步淘汰 GitHub 問題作為內容的意見反應機制,並將它取代為新的意見反應系統。 如需詳細資訊,請參閱:提交並檢視相關的意見反應