# String.CompareString.CompareString.CompareString.Compare Method

## 多載

 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, 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, 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, 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, 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. 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, 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, 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, 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, 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.

## 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

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.

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

``````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

strB
String String String String

#### 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

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.

### 範例

``````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
``````
``````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
``````

``````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;

// 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();

// 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.

' 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

``````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
``````

``````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

[!code-csharpSystem.String.Compare#21] [!code-vbSystem.String.Compare#21][!code-csharpSystem.String.Compare#21] [!code-vbSystem.String.Compare#21] 若要在字串比較中辨識可忽略的字元Compare(String, String, StringComparison) , 請呼叫方法, 並為Ordinal `comparisonType`參數OrdinalIgnoreCase提供或的值。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.

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

``````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

strB
String String String String

ignoreCase
Boolean Boolean Boolean Boolean

`true` 表示在比較時忽略大小寫，否則為 `false``true` 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

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.

### 範例

``````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
``````
``````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

``````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
``````

``````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

[!code-csharpSystem.String.Compare#22] [!code-vbSystem.String.Compare#22][!code-csharpSystem.String.Compare#22] [!code-vbSystem.String.Compare#22] 若要在字串比較中辨識可忽略的字元Compare(String, String, StringComparison) , 請呼叫方法, 並為Ordinal `comparisonType`參數OrdinalIgnoreCase提供或的值。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.

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

``````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

strB
String String String String

comparisonType
StringComparison StringComparison StringComparison StringComparison

#### 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

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.

#### 例外狀況

`comparisonType` 不是 StringComparison 值。`comparisonType` is not a StringComparison value.

### 範例

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

using namespace System;

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}",

// 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;

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(

// 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

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, _

' 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`參數指出比較是否應使用目前或不因文化特性而異、接受或忽略比較元組的大小寫, 或使用 word (區分文化特性) 或序數 (不區分文化特性) 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.

``````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
``````

``````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
``````

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

``````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

strB
String String String String

ignoreCase
Boolean Boolean Boolean Boolean

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

culture
CultureInfo CultureInfo CultureInfo CultureInfo

#### 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

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.

#### 例外狀況

`culture``null``culture` is `null`.

### 範例

``````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

``````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
``````

``````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

[!code-csharpSystem.String.Compare#23] [!code-vbSystem.String.Compare#23][!code-csharpSystem.String.Compare#23] [!code-vbSystem.String.Compare#23] 若要在字串比較中辨識可忽略的字元Compare(String, String, CultureInfo, CompareOptions) , 請呼叫方法, 並為Ordinal `options`參數OrdinalIgnoreCase提供或的值。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.

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

``````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

strB
String String String String

culture
CultureInfo CultureInfo CultureInfo CultureInfo

options
CompareOptions CompareOptions CompareOptions CompareOptions

#### 傳回

32 位元帶正負號的整數，這個整數表示 `strA``strB` 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

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.

#### 例外狀況

`options` 不是 CompareOptions 值。`options` is not a CompareOptions value.

`culture``null``culture` is `null`.

### 範例

``````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

Compare(String, String, CultureInfo, CompareOptions)方法主要是用來在排序或 Alphabetizing 作業中使用。The Compare(String, String, CultureInfo, CompareOptions) method is designed primarily for use in sorting or alphabetizing operations. 當方法呼叫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值是否為零) 時, 不應使用它。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Equals呼叫方法。To determine whether two strings are equivalent, call the Equals method.

`options`參數可以進一步指定比較, 這是由CompareOptions列舉的一或多個成員所組成。The comparison can be further specified by the `options` parameter, which consists of one or more members of the CompareOptions enumeration. 不過, 因為這個方法的目的是要進行區分文化特性的字串比較, CompareOptions.Ordinal所以和CompareOptions.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.

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

``````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

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

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

#### 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

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.

#### 例外狀況

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

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

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

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

### 範例

``````// 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'.
*/
``````
``````' 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

``````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
``````

``````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
``````

## 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)

``````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

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

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

ignoreCase
Boolean Boolean Boolean Boolean

`true` 表示在比較時忽略大小寫，否則為 `false``true` 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

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.

#### 例外狀況

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

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

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

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

### 範例

``````// 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()
{
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

``````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
``````

``````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
``````

## 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)

``````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

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

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

comparisonType
StringComparison StringComparison StringComparison StringComparison

#### 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

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.

#### 例外狀況

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

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

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

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

`comparisonType` 不是 StringComparison 值。`comparisonType` is not a StringComparison value.

### 範例

``````// 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'.
*/
``````
``````' 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

`comparisonType`參數指出比較是否應使用目前或不因文化特性而異、接受或忽略比較元組的大小寫, 或使用 word (區分文化特性) 或序數 (不區分文化特性) 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.

``````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
``````

``````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
``````

## 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)

``````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

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

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

ignoreCase
Boolean Boolean Boolean Boolean

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

culture
CultureInfo CultureInfo CultureInfo CultureInfo

#### 傳回

Value 條件Condition

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.

#### 例外狀況

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

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

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

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

`culture``null``culture` is `null`.

### 範例

``````// 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

``````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
``````

``````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
``````

## 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)

``````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

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

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

culture
CultureInfo CultureInfo CultureInfo CultureInfo

options
CompareOptions CompareOptions CompareOptions CompareOptions

#### 傳回

Value 條件Condition

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.

#### 例外狀況

`options` 不是 CompareOptions 值。`options` is not a CompareOptions value.

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

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

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

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

`culture``null``culture` is `null`.

### 範例

``````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

Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)方法主要是用來在排序或 Alphabetizing 作業中使用。The Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method is designed primarily for use in sorting or alphabetizing operations. 當方法呼叫的主要目的是要判斷兩個子字串是否相等時 (亦即, 當方法呼叫的目的是要測試傳回值是否為零) 時, 不應使用它。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Equals呼叫方法。To determine whether two strings are equivalent, call the Equals method.

`null``strA` 的其中一個或兩者`strB`都可以是。One or both of `strA` and `strB` can be `null`. 根據定義, 任何字串 (包括String.Empty) 都會比較大於 null 參考, 而且兩個 null 參考的比較是否相等。By definition, any string, including String.Empty, compares greater than a null reference, and two null references compare equal to each other.

`options`參數可以進一步指定比較, 這是由System.Globalization.CompareOptions列舉的一或多個成員所組成。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, 因為這個方法的目的是要進行區分文化特性的字串比較, CompareOptions.Ordinal所以和CompareOptions.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.