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String.Compare 메서드 (String, Int32, String, Int32, Int32, Boolean)

 

대/소문자를 구분하거나 구분하지 않고 지정된 두 String 개체의 부분 문자열을 비교하여 정렬 순서에서 두 개체의 상대 위치를 나타내는 정수를 반환합니다.

네임스페이스:   System
어셈블리:  mscorlib(mscorlib.dll에 있음)

public static int Compare(
	string strA,
	int indexA,
	string strB,
	int indexB,
	int length,
	bool ignoreCase
)

매개 변수

strA
Type: System.String

비교에 사용할 첫 번째 문자열입니다.

indexA
Type: System.Int32

strA에 있는 부분 문자열의 위치입니다.

strB
Type: System.String

비교에 사용할 두 번째 문자열입니다.

indexB
Type: System.Int32

strB에 있는 부분 문자열의 위치입니다.

length
Type: System.Int32

비교할 부분 문자열의 최대 문자 수입니다.

ignoreCase
Type: System.Boolean

비교 시 대/소문자를 무시하려면 true이고, 그러지 않으면 false입니다.

반환 값

Type: System.Int32

두 비교 대상 간의 어휘 관계를 나타내는 32비트 부호 있는 정수입니다.

조건

0보다 작음

strA의 부분 문자열이 정렬 순서에서 strB의 부분 문자열 앞에 오는 경우

0

부분 문자열이 정렬 순서에서 같은 위치에 나오거나 length가 0인 경우

0보다 큼

strA의 부분 문자열이 정렬 순서에서 strB의 부분 문자열 다음에 오는 경우

Exception Condition
ArgumentOutOfRangeException

indexAstrA.Length보다 큽니다.

또는

indexBstrB.Length보다 큽니다.

또는

indexA, indexB 또는 length가 음수입니다.

또는

indexA 또는 indexBnull이고 length가 0보다 큽니다.

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. 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 current culture 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 T:System.Globalization.CompareOptions.

System_CAPS_warning경고

When comparing strings, you should call the M:System.String.Compare(System.String,System.Int32,System.String,System.Int32,System.Int32,System.StringComparison) method, which requires that you explicitly specify the type of string comparison that the method uses. For more information, see Best Practices for Using Strings in the .NET Framework.

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);
}

The path name needs to be compared in an invariant manner. 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);
}

호출자 참고 사항:

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

The following example performs two comparisons of two substrings that only differ in case. The first comparison ignores case and the second comparison considers case.

// Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean)
using System;

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

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

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

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

Honor case:
Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
*/

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