Given a string S and two integers L and R print the characters in the range L to R of the string

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 Int32

An integer that indicates the lexical relationship between the two comparands.

Inhaltsverzeichnis Show

Notes to Callers

Value	Condition
Less than zero	The substring in strA precedes the substring in strB in the sort order.
Zero	The substrings occur in the same position in the sort order, or length is zero.
Greater than zero	The substring in strA follows the substring in strB in the sort order.

Examples

The following example compares two substrings using different cultures and ignoring the case of the substrings. The choice of culture affects how the letter "I" is compared.

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

Remarks

The substrings to compare start in strA at indexA, and in strB at indexB. Both indexA and indexB are zero-based; that is, the first character in strA and strB is at position zero, not position one. The length of the first substring is equal to the length of strA minus indexA plus one. The length of the second substring is equal to the length of strB minus indexB plus one.

The number of characters to compare is the lesser of the lengths of the two substrings, and length. The indexA, indexB, and length parameters must be nonnegative.

The comparison uses the culture parameter to obtain culture-specific information such as casing rules and the alphabetic order of individual characters. For example, a culture could specify that certain combinations of characters be treated as a single character, or uppercase and lowercase characters be compared in a particular way, or that the sorting order of a character depends on the characters that precede or follow it.

The comparison is performed using word sort rules. For more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

One or both comparands can be null. By definition, any string, including the empty string (""), compares greater than a null reference; and two null references compare equal to each other.

The comparison terminates when an inequality is discovered or both substrings have been compared. However, if the two strings compare equal to the end of one string, and the other string has characters remaining, then the string with remaining characters is considered greater. The return value is the result of the last comparison performed.

Unexpected results can occur when comparisons are affected by culture-specific casing rules. For example, in Turkish, the following example yields the wrong results because the file system in Turkish does not use linguistic casing rules for the letter "i" in "file".

static bool IsFileURI(String^ path) { return (String::Compare(path, 0, "file:", 0, 5, true) == 0); } static bool IsFileURI(String path) { return (String.Compare(path, 0, "file:", 0, 5, true) == 0); } 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

Compare the path name to "file" using an ordinal comparison. The correct code to do this is as follows:

static bool IsFileURI(String^ path) { return (String::Compare(path, 0, "file:", 0, 5, StringComparison::OrdinalIgnoreCase) == 0); } static bool IsFileURI(String path) { return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0); } 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

Notes to Callers

Character sets include ignorable characters. The Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo) method does not consider these characters when it performs a linguistic or culture-sensitive comparison. To recognize ignorable characters in your comparison, call the Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) method and supply a value of Ordinal or OrdinalIgnoreCase for the options parameter.