JSTL의 비교연산, ep, ne, empty
[의미]
1. eq = equal (==)
2. ne = not equal (!=)
3. empty = list,map등의 객체가 값이 있다,없다를 구분(ex)empty, !empty)
[사용예시]
[eq]
null | <c:if test="${ null eq columnName }"> |
숫자 | <c:if test="${ 0 eq columnName }"> |
문자 | <c:if test="${ '0' eq columnName }"> |
[ne (!=)]
null | <c:if test="${ null ne columnName }"> |
숫자 | <c:if test="${ 0 ne columnName }"> |
문자 | <c:if test="${ '0' ne columnName }"> |
[empty]
객체의 값이 비어있다. | <c:if test="${ empty columnMap}"> |
객체의 값이 있다. | <c:if test="${ !empty columnMap}"> |
[실제 적용 소스]
[출처] eq, ne, empty 사용|작성자 맛동산
[출처] eq, ne, empty 사용|작성자 맛동산
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String.Equals 메서드
- 참조
정의
이 문서의 내용
오버로드
Equals(String, StringComparison)
이 문자열과 지정한 String 개체의 값이 같은지를 확인합니다. 매개 변수는 비교에 사용되는 문화권, 대/소문자 및 정렬 규칙을 지정합니다.
public: bool Equals(System::String ^ value, StringComparison comparisonType);public bool Equals (string value, StringComparison comparisonType);public bool Equals (string? value, StringComparison comparisonType);override this.Equals : string * StringComparison -> boolPublic Function Equals (value As String, comparisonType As StringComparison) As Boolean매개 변수
value String
이 인스턴스와 비교할 문자열입니다.
반환
Booleantrue 매개 변수와 이 문자열의 값이 같으면 value이고, 그러지 않으면 false입니다.
예외
예제
다음 예제에서는 대문자 "I", 소문자 "i" 및 점 없는 "ı"로 구성 된 문자열 배열을 만듭니다. 그런 다음 메서드를 호출 Equals(String, StringComparison) 하 여 가능한 각 열거형 값을 사용 하 여 비교 StringComparison 합니다.
using System; class Sample { public static void Main() { // Define a string array with the following three "I" characters: // U+0069, U+0131, and U+0049. string[] threeIs = { "i", "ı", "I" }; // Define Type object representing StringComparison type. Type scType = typeof(StringComparison); // Show the current culture (for culture-sensitive string comparisons). Console.WriteLine("The current culture is {0}.\n", System.Globalization.CultureInfo.CurrentCulture.Name); // Perform comparisons using each StringComparison member. foreach (string scName in Enum.GetNames(scType)) { StringComparison sc = (StringComparison) Enum.Parse(scType, scName); Console.WriteLine("Comparisons using {0}:", sc); // Compare each character in character array. for (int ctr = 0; ctr <= 1; ctr++) { string instanceChar = threeIs[ctr]; for (int innerCtr = ctr + 1; innerCtr <= threeIs.GetUpperBound(0); innerCtr++) { string otherChar = threeIs[innerCtr]; Console.WriteLine("{0} (U+{1}) = {2} (U+{3}): {4}", instanceChar, Convert.ToInt16(Char.Parse(instanceChar)).ToString("X4"), otherChar, Convert.ToInt16(Char.Parse(otherChar)).ToString("X4"), instanceChar.Equals(otherChar, sc)); } Console.WriteLine(); } } } } // The example displays the following output: // The current culture is en-US. // // Comparisons using CurrentCulture: // i (U+0069) = i (U+0131): False // i (U+0069) = I (U+0049): False // // i (U+0131) = I (U+0049): False // // Comparisons using CurrentCultureIgnoreCase: // i (U+0069) = i (U+0131): False // i (U+0069) = I (U+0049): True // // i (U+0131) = I (U+0049): False // // Comparisons using InvariantCulture: // i (U+0069) = i (U+0131): False // i (U+0069) = I (U+0049): False // // i (U+0131) = I (U+0049): False // // Comparisons using InvariantCultureIgnoreCase: // i (U+0069) = i (U+0131): False // i (U+0069) = I (U+0049): True // // i (U+0131) = I (U+0049): False // // Comparisons using Ordinal: // i (U+0069) = i (U+0131): False // i (U+0069) = I (U+0049): False // // i (U+0131) = I (U+0049): False // // Comparisons using OrdinalIgnoreCase: // i (U+0069) = i (U+0131): False // i (U+0069) = I (U+0049): True // // i (U+0131) = I (U+0049): False Class Sample Public Shared Sub Main() ' Define a string array with the following three "I" characters: ' U+0069, U+0131, and U+0049. Dim threeIs() As String = { "i", "ı", "I" } ' Define Type object representing StringComparison type. Dim scType As Type = GetType(StringComparison) ' Show the current culture (for culture-sensitive string comparisons). Console.WriteLine("The current culture is {0}." & vbCrLf, _ System.Globalization.CultureInfo.CurrentCulture.Name) ' Perform comparisons using each StringComparison member. For Each scName As String In [Enum].GetNames(scType) Dim sc As StringComparison = [Enum].Parse(scType, scName) Console.WriteLine("Comparisons using {0}:", sc) ' Compare each character in character array. For ctr As Integer = 0 To 1 Dim instanceChar As String = threeIs(ctr) For innerCtr As Integer = ctr + 1 To threeIs.GetUpperBound(0) Dim otherChar As STring = threeIs(innerCtr) Console.WriteLine("{0} (U+{1}) = {2} (U+{3}): {4}", _ instanceChar, Convert.ToInt16(Char.Parse(instanceChar)).ToString("X4"), _ otherChar, Convert.ToInt16(Char.Parse(otherChar)).ToString("X4"), _ instanceChar.Equals(otherChar, sc)) Next Console.WriteLine() Next Next End Sub End Class ' The example displays the following output: ' The current culture is en-US. ' ' Comparisons using CurrentCulture: ' i (U+0069) = i (U+0131): False ' i (U+0069) = I (U+0049): False ' ' i (U+0131) = I (U+0049): False ' ' Comparisons using CurrentCultureIgnoreCase: ' i (U+0069) = i (U+0131): False ' i (U+0069) = I (U+0049): True ' ' i (U+0131) = I (U+0049): False ' ' Comparisons using InvariantCulture: ' i (U+0069) = i (U+0131): False ' i (U+0069) = I (U+0049): False ' ' i (U+0131) = I (U+0049): False ' ' Comparisons using InvariantCultureIgnoreCase: ' i (U+0069) = i (U+0131): False ' i (U+0069) = I (U+0049): True ' ' i (U+0131) = I (U+0049): False ' ' Comparisons using Ordinal: ' i (U+0069) = i (U+0131): False ' i (U+0069) = I (U+0049): False ' ' i (U+0131) = I (U+0049): False ' ' Comparisons using OrdinalIgnoreCase: ' i (U+0069) = i (U+0131): False ' i (U+0069) = I (U+0049): True ' ' i (U+0131) = I (U+0049): False다음 예제에서는 열거형의 각 멤버를 사용 하 여 4 개의 단어 집합을 비교 합니다 StringComparison . 비교에서는 영어 (미국) 및 라프어 (Upper 스웨덴) 문화권의 규칙을 사용 합니다. 문자열 "encyclopædia" 및 "encyclopaedia"는 en-us 문화권에서 동일 하 게 간주 되지만 Sami (북부 스웨덴) 문화권이 아닌 것으로 간주 됩니다.
using System; using System.Globalization; using System.Threading; public class Example { public static void Main() { String[] cultureNames = { "en-US", "se-SE" }; String[] strings1 = { "case", "encyclopædia", "encyclopædia", "Archæology" }; String[] strings2 = { "Case", "encyclopaedia", "encyclopedia" , "ARCHÆOLOGY" }; StringComparison[] comparisons = (StringComparison[]) Enum.GetValues(typeof(StringComparison)); foreach (var cultureName in cultureNames) { Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureName); Console.WriteLine("Current Culture: {0}", CultureInfo.CurrentCulture.Name); for (int ctr = 0; ctr <= strings1.GetUpperBound(0); ctr++) { foreach (var comparison in comparisons) Console.WriteLine(" {0} = {1} ({2}): {3}", strings1[ctr], strings2[ctr], comparison, strings1[ctr].Equals(strings2[ctr], comparison)); Console.WriteLine(); } Console.WriteLine(); } } } // The example displays the following output: // Current Culture: en-US // case = Case (CurrentCulture): False // case = Case (CurrentCultureIgnoreCase): True // case = Case (InvariantCulture): False // case = Case (InvariantCultureIgnoreCase): True // case = Case (Ordinal): False // case = Case (OrdinalIgnoreCase): True // // encyclopædia = encyclopaedia (CurrentCulture): True // encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): True // encyclopædia = encyclopaedia (InvariantCulture): True // encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True // encyclopædia = encyclopaedia (Ordinal): False // encyclopædia = encyclopaedia (OrdinalIgnoreCase): False // // encyclopædia = encyclopedia (CurrentCulture): False // encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False // encyclopædia = encyclopedia (InvariantCulture): False // encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False // encyclopædia = encyclopedia (Ordinal): False // encyclopædia = encyclopedia (OrdinalIgnoreCase): False // // Archæology = ARCHÆOLOGY (CurrentCulture): False // Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (InvariantCulture): False // Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (Ordinal): False // Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True // // // Current Culture: se-SE // case = Case (CurrentCulture): False // case = Case (CurrentCultureIgnoreCase): True // case = Case (InvariantCulture): False // case = Case (InvariantCultureIgnoreCase): True // case = Case (Ordinal): False // case = Case (OrdinalIgnoreCase): True // // encyclopædia = encyclopaedia (CurrentCulture): False // encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): False // encyclopædia = encyclopaedia (InvariantCulture): True // encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True // encyclopædia = encyclopaedia (Ordinal): False // encyclopædia = encyclopaedia (OrdinalIgnoreCase): False // // encyclopædia = encyclopedia (CurrentCulture): False // encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False // encyclopædia = encyclopedia (InvariantCulture): False // encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False // encyclopædia = encyclopedia (Ordinal): False // encyclopædia = encyclopedia (OrdinalIgnoreCase): False // // Archæology = ARCHÆOLOGY (CurrentCulture): False // Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (InvariantCulture): False // Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (Ordinal): False // Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True Imports System.Globalization Imports System.Threading Module Example Public Sub Main() Dim cultureNames() As String = { "en-US", "se-SE" } Dim strings1() As String = { "case", "encyclopædia", "encyclopædia", "Archæology" } Dim strings2() As String = { "Case", "encyclopaedia", "encyclopedia" , "ARCHÆOLOGY" } Dim comparisons() As StringComparison = CType([Enum].GetValues(GetType(StringComparison)), StringComparison()) For Each cultureName In cultureNames Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureName) Console.WriteLine("Current Culture: {0}", CultureInfo.CurrentCulture.Name) For ctr As Integer = 0 To strings1.GetUpperBound(0) For Each comparison In comparisons Console.WriteLine(" {0} = {1} ({2}): {3}", strings1(ctr), strings2(ctr), comparison, strings1(ctr).Equals(strings2(ctr), comparison)) Next Console.WriteLine() Next Console.WriteLine() Next End Sub End Module ' The example displays the following output: ' Current Culture: en-US ' case = Case (CurrentCulture): False ' case = Case (CurrentCultureIgnoreCase): True ' case = Case (InvariantCulture): False ' case = Case (InvariantCultureIgnoreCase): True ' case = Case (Ordinal): False ' case = Case (OrdinalIgnoreCase): True ' ' encyclopædia = encyclopaedia (CurrentCulture): True ' encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): True ' encyclopædia = encyclopaedia (InvariantCulture): True ' encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True ' encyclopædia = encyclopaedia (Ordinal): False ' encyclopædia = encyclopaedia (OrdinalIgnoreCase): False ' ' encyclopædia = encyclopedia (CurrentCulture): False ' encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False ' encyclopædia = encyclopedia (InvariantCulture): False ' encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False ' encyclopædia = encyclopedia (Ordinal): False ' encyclopædia = encyclopedia (OrdinalIgnoreCase): False ' ' Archæology = ARCHÆOLOGY (CurrentCulture): False ' Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (InvariantCulture): False ' Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (Ordinal): False ' Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True ' ' ' Current Culture: se-SE ' case = Case (CurrentCulture): False ' case = Case (CurrentCultureIgnoreCase): True ' case = Case (InvariantCulture): False ' case = Case (InvariantCultureIgnoreCase): True ' case = Case (Ordinal): False ' case = Case (OrdinalIgnoreCase): True ' ' encyclopædia = encyclopaedia (CurrentCulture): False ' encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): False ' encyclopædia = encyclopaedia (InvariantCulture): True ' encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True ' encyclopædia = encyclopaedia (Ordinal): False ' encyclopædia = encyclopaedia (OrdinalIgnoreCase): False ' ' encyclopædia = encyclopedia (CurrentCulture): False ' encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False ' encyclopædia = encyclopedia (InvariantCulture): False ' encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False ' encyclopædia = encyclopedia (Ordinal): False ' encyclopædia = encyclopedia (OrdinalIgnoreCase): False ' ' Archæology = ARCHÆOLOGY (CurrentCulture): False ' Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (InvariantCulture): False ' Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (Ordinal): False ' Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True설명
comparisonType매개 변수는 비교 시 현재 또는 고정 문화권을 사용 해야 하는지 여부를 지정 하 고 비교 하는 두 문자열의 대/소문자를 그대로 사용 하거나 무시 하거나 단어 또는 서 수 정렬 규칙을 사용 합니다.
추가 정보
- CompareOrdinal(String, String)
적용 대상
Equals(String, String)
지정된 두 String 개체의 값이 같은지를 확인합니다.
public: static bool Equals(System::String ^ a, System::String ^ b);public static bool Equals (string a, string b);public static bool Equals (string? a, string? b);static member Equals : string * string -> boolPublic Shared Function Equals (a As String, b As String) As Boolean매개 변수
a String
비교할 첫 번째 문자열 또는 null입니다.
b String
비교할 두 번째 문자열 또는 null입니다.
반환
Booleantrue의 값이 a의 값과 같으면 b이고, 그렇지 않으면 false입니다. a 및 b가 null인 경우 이 메서드는 true를 반환합니다.
예제
다음 예제는 Equals 메서드.
// Sample for String::Equals(Object) // String::Equals(String) // String::Equals(String, String) using namespace System; using namespace System::Text; int main() { StringBuilder^ sb = gcnew StringBuilder( "abcd" ); String^ str1 = "abcd"; String^ str2 = nullptr; Object^ o2 = nullptr; Console::WriteLine(); Console::WriteLine( " * The value of String str1 is '{0}'.", str1 ); Console::WriteLine( " * The value of StringBuilder sb is '{0}'.", sb ); Console::WriteLine(); Console::WriteLine( "1a) String::Equals(Object). Object is a StringBuilder, not a String." ); Console::WriteLine( " Is str1 equal to sb?: {0}", str1->Equals( sb ) ); Console::WriteLine(); Console::WriteLine( "1b) String::Equals(Object). Object is a String." ); str2 = sb->ToString(); o2 = str2; Console::WriteLine( " * The value of Object o2 is '{0}'.", o2 ); Console::WriteLine( " Is str1 equal to o2?: {0}", str1->Equals( o2 ) ); Console::WriteLine(); Console::WriteLine( " 2) String::Equals(String)" ); Console::WriteLine( " * The value of String str2 is '{0}'.", str2 ); Console::WriteLine( " Is str1 equal to str2?: {0}", str1->Equals( str2 ) ); Console::WriteLine(); Console::WriteLine( " 3) String::Equals(String, String)" ); Console::WriteLine( " Is str1 equal to str2?: {0}", String::Equals( str1, str2 ) ); } /* This example produces the following results: * The value of String str1 is 'abcd'. * The value of StringBuilder sb is 'abcd'. 1a) String::Equals(Object). Object is a StringBuilder, not a String. Is str1 equal to sb?: False 1b) String::Equals(Object). Object is a String. * The value of Object o2 is 'abcd'. Is str1 equal to o2?: True 2) String::Equals(String) * The value of String str2 is 'abcd'. Is str1 equal to str2?: True 3) String::Equals(String, String) Is str1 equal to str2?: True */ // Sample for String.Equals(Object) // String.Equals(String) // String.Equals(String, String) using System; using System.Text; class Sample { public static void Main() { StringBuilder sb = new StringBuilder("abcd"); String str1 = "abcd"; String str2 = null; Object o2 = null; Console.WriteLine(); Console.WriteLine(" * The value of String str1 is '{0}'.", str1); Console.WriteLine(" * The value of StringBuilder sb is '{0}'.", sb.ToString()); Console.WriteLine(); Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String."); Console.WriteLine(" Is str1 equal to sb?: {0}", str1.Equals(sb)); Console.WriteLine(); Console.WriteLine("1b) String.Equals(Object). Object is a String."); str2 = sb.ToString(); o2 = str2; Console.WriteLine(" * The value of Object o2 is '{0}'.", o2); Console.WriteLine(" Is str1 equal to o2?: {0}", str1.Equals(o2)); Console.WriteLine(); Console.WriteLine(" 2) String.Equals(String)"); Console.WriteLine(" * The value of String str2 is '{0}'.", str2); Console.WriteLine(" Is str1 equal to str2?: {0}", str1.Equals(str2)); Console.WriteLine(); Console.WriteLine(" 3) String.Equals(String, String)"); Console.WriteLine(" Is str1 equal to str2?: {0}", String.Equals(str1, str2)); } } /* This example produces the following results: * The value of String str1 is 'abcd'. * The value of StringBuilder sb is 'abcd'. 1a) String.Equals(Object). Object is a StringBuilder, not a String. Is str1 equal to sb?: False 1b) String.Equals(Object). Object is a String. * The value of Object o2 is 'abcd'. Is str1 equal to o2?: True 2) String.Equals(String) * The value of String str2 is 'abcd'. Is str1 equal to str2?: True 3) String.Equals(String, String) Is str1 equal to str2?: True */ ' Sample for String.Equals(Object) ' String.Equals(String) ' String.Equals(String, String) Imports System.Text Class Sample Public Shared Sub Main() Dim sb As New StringBuilder("abcd") Dim str1 As [String] = "abcd" Dim str2 As [String] = Nothing Dim o2 As [Object] = Nothing Console.WriteLine() Console.WriteLine(" * The value of String str1 is '{0}'.", str1) Console.WriteLine(" * The value of StringBuilder sb is '{0}'.", sb.ToString()) Console.WriteLine() Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String.") Console.WriteLine(" Is str1 equal to sb?: {0}", str1.Equals(sb)) Console.WriteLine() Console.WriteLine("1b) String.Equals(Object). Object is a String.") str2 = sb.ToString() o2 = str2 Console.WriteLine(" * The value of Object o2 is '{0}'.", o2) Console.WriteLine(" Is str1 equal to o2?: {0}", str1.Equals(o2)) Console.WriteLine() Console.WriteLine(" 2) String.Equals(String)") Console.WriteLine(" * The value of String str2 is '{0}'.", str2) Console.WriteLine(" Is str1 equal to str2?: {0}", str1.Equals(str2)) Console.WriteLine() Console.WriteLine(" 3) String.Equals(String, String)") Console.WriteLine(" Is str1 equal to str2?: {0}", [String].Equals(str1, str2)) End Sub End Class ' 'This example produces the following results: ' ' * The value of String str1 is 'abcd'. ' * The value of StringBuilder sb is 'abcd'. ' '1a) String.Equals(Object). Object is a StringBuilder, not a String. ' Is str1 equal to sb?: False ' '1b) String.Equals(Object). Object is a String. ' * The value of Object o2 is 'abcd'. ' Is str1 equal to o2?: True ' ' 2) String.Equals(String) ' * The value of String str2 is 'abcd'. ' Is str1 equal to str2?: True ' ' 3) String.Equals(String, String) ' Is str1 equal to str2?: True '설명
이 메서드는 서 수 (대/소문자 구분 및 문화권을 구분 하지 않는) 비교를 수행 합니다.
추가 정보
- CompareOrdinal(String, String)
적용 대상
Equals(String, String, StringComparison)
지정된 두 String 개체의 값이 같은지를 확인합니다. 매개 변수는 비교에 사용되는 문화권, 대/소문자 및 정렬 규칙을 지정합니다.
public: static bool Equals(System::String ^ a, System::String ^ b, StringComparison comparisonType);public static bool Equals (string a, string b, StringComparison comparisonType);public static bool Equals (string? a, string? b, StringComparison comparisonType);static member Equals : string * string * StringComparison -> boolPublic Shared Function Equals (a As String, b As String, comparisonType As StringComparison) As Boolean매개 변수
a String
비교할 첫 번째 문자열 또는 null입니다.
b String
비교할 두 번째 문자열 또는 null입니다.
반환
Booleantrue 매개 변수와 a 매개 변수의 값이 같으면 b이고, 그러지 않으면 false입니다.
예외
예제
다음 예제에서는 열거형의 각 멤버를 사용 하 여 4 개의 단어 집합을 비교 합니다 StringComparison . 비교에서는 영어 (미국) 및 라프어 (Upper 스웨덴) 문화권의 규칙을 사용 합니다. 문자열 "encyclopædia" 및 "encyclopaedia"는 en-us 문화권에서 동일 하 게 간주 되지만 Sami (북부 스웨덴) 문화권이 아닌 것으로 간주 됩니다.
using System; using System.Globalization; using System.Threading; public class Example { public static void Main() { String[] cultureNames = { "en-US", "se-SE" }; String[] strings1 = { "case", "encyclopædia", "encyclopædia", "Archæology" }; String[] strings2 = { "Case", "encyclopaedia", "encyclopedia" , "ARCHÆOLOGY" }; StringComparison[] comparisons = (StringComparison[]) Enum.GetValues(typeof(StringComparison)); foreach (var cultureName in cultureNames) { Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureName); Console.WriteLine("Current Culture: {0}", CultureInfo.CurrentCulture.Name); for (int ctr = 0; ctr <= strings1.GetUpperBound(0); ctr++) { foreach (var comparison in comparisons) Console.WriteLine(" {0} = {1} ({2}): {3}", strings1[ctr], strings2[ctr], comparison, String.Equals(strings1[ctr], strings2[ctr], comparison)); Console.WriteLine(); } Console.WriteLine(); } } } // The example displays the following output: // Current Culture: en-US // case = Case (CurrentCulture): False // case = Case (CurrentCultureIgnoreCase): True // case = Case (InvariantCulture): False // case = Case (InvariantCultureIgnoreCase): True // case = Case (Ordinal): False // case = Case (OrdinalIgnoreCase): True // // encyclopædia = encyclopaedia (CurrentCulture): True // encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): True // encyclopædia = encyclopaedia (InvariantCulture): True // encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True // encyclopædia = encyclopaedia (Ordinal): False // encyclopædia = encyclopaedia (OrdinalIgnoreCase): False // // encyclopædia = encyclopedia (CurrentCulture): False // encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False // encyclopædia = encyclopedia (InvariantCulture): False // encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False // encyclopædia = encyclopedia (Ordinal): False // encyclopædia = encyclopedia (OrdinalIgnoreCase): False // // Archæology = ARCHÆOLOGY (CurrentCulture): False // Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (InvariantCulture): False // Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (Ordinal): False // Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True // // // Current Culture: se-SE // case = Case (CurrentCulture): False // case = Case (CurrentCultureIgnoreCase): True // case = Case (InvariantCulture): False // case = Case (InvariantCultureIgnoreCase): True // case = Case (Ordinal): False // case = Case (OrdinalIgnoreCase): True // // encyclopædia = encyclopaedia (CurrentCulture): False // encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): False // encyclopædia = encyclopaedia (InvariantCulture): True // encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True // encyclopædia = encyclopaedia (Ordinal): False // encyclopædia = encyclopaedia (OrdinalIgnoreCase): False // // encyclopædia = encyclopedia (CurrentCulture): False // encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False // encyclopædia = encyclopedia (InvariantCulture): False // encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False // encyclopædia = encyclopedia (Ordinal): False // encyclopædia = encyclopedia (OrdinalIgnoreCase): False // // Archæology = ARCHÆOLOGY (CurrentCulture): False // Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (InvariantCulture): False // Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True // Archæology = ARCHÆOLOGY (Ordinal): False // Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True Imports System.Globalization Imports System.Threading Module Example Public Sub Main() Dim cultureNames() As String = { "en-US", "se-SE" } Dim strings1() As String = { "case", "encyclopædia", "encyclopædia", "Archæology" } Dim strings2() As String = { "Case", "encyclopaedia", "encyclopedia" , "ARCHÆOLOGY" } Dim comparisons() As StringComparison = CType([Enum].GetValues(GetType(StringComparison)), StringComparison()) For Each cultureName In cultureNames Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureName) Console.WriteLine("Current Culture: {0}", CultureInfo.CurrentCulture.Name) For ctr As Integer = 0 To strings1.GetUpperBound(0) For Each comparison In comparisons Console.WriteLine(" {0} = {1} ({2}): {3}", strings1(ctr), strings2(ctr), comparison, String.Equals(strings1(ctr), strings2(ctr), comparison)) Next Console.WriteLine() Next Console.WriteLine() Next End Sub End Module ' The example displays the following output: ' Current Culture: en-US ' case = Case (CurrentCulture): False ' case = Case (CurrentCultureIgnoreCase): True ' case = Case (InvariantCulture): False ' case = Case (InvariantCultureIgnoreCase): True ' case = Case (Ordinal): False ' case = Case (OrdinalIgnoreCase): True ' ' encyclopædia = encyclopaedia (CurrentCulture): True ' encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): True ' encyclopædia = encyclopaedia (InvariantCulture): True ' encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True ' encyclopædia = encyclopaedia (Ordinal): False ' encyclopædia = encyclopaedia (OrdinalIgnoreCase): False ' ' encyclopædia = encyclopedia (CurrentCulture): False ' encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False ' encyclopædia = encyclopedia (InvariantCulture): False ' encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False ' encyclopædia = encyclopedia (Ordinal): False ' encyclopædia = encyclopedia (OrdinalIgnoreCase): False ' ' Archæology = ARCHÆOLOGY (CurrentCulture): False ' Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (InvariantCulture): False ' Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (Ordinal): False ' Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True ' ' ' Current Culture: se-SE ' case = Case (CurrentCulture): False ' case = Case (CurrentCultureIgnoreCase): True ' case = Case (InvariantCulture): False ' case = Case (InvariantCultureIgnoreCase): True ' case = Case (Ordinal): False ' case = Case (OrdinalIgnoreCase): True ' ' encyclopædia = encyclopaedia (CurrentCulture): False ' encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): False ' encyclopædia = encyclopaedia (InvariantCulture): True ' encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True ' encyclopædia = encyclopaedia (Ordinal): False ' encyclopædia = encyclopaedia (OrdinalIgnoreCase): False ' ' encyclopædia = encyclopedia (CurrentCulture): False ' encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False ' encyclopædia = encyclopedia (InvariantCulture): False ' encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False ' encyclopædia = encyclopedia (Ordinal): False ' encyclopædia = encyclopedia (OrdinalIgnoreCase): False ' ' Archæology = ARCHÆOLOGY (CurrentCulture): False ' Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (InvariantCulture): False ' Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True ' Archæology = ARCHÆOLOGY (Ordinal): False ' Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True설명
comparisonType매개 변수는 비교 시 현재 또는 고정 문화권을 사용 해야 하는지 여부를 지정 하 고 비교 하는 두 문자열의 대/소문자를 그대로 사용 하거나 무시 하거나 단어 또는 서 수 정렬 규칙을 사용 합니다.
추가 정보
- CompareOrdinal(String, String)
적용 대상
Equals(Object)
이 인스턴스와 지정한 개체의 값이 같은지를 확인합니다. 이 개체도 String 개체여야 합니다.
public: override bool Equals(System::Object ^ obj);public override bool Equals (object obj);public override bool Equals (object? obj);override this.Equals : obj -> boolPublic Overrides Function Equals (obj As Object) As Boolean매개 변수
obj Object
이 인스턴스와 비교할 문자열입니다.
반환
Booleantrue가 obj이고 이 인스턴스와 같은 값을 가지면 String이고, 그러지 않으면 false입니다. obj가 null이면 메서드에서 false을 반환합니다.
예제
다음 예제는 Equals 메서드.
// Sample for String::Equals(Object) // String::Equals(String) // String::Equals(String, String) using namespace System; using namespace System::Text; int main() { StringBuilder^ sb = gcnew StringBuilder( "abcd" ); String^ str1 = "abcd"; String^ str2 = nullptr; Object^ o2 = nullptr; Console::WriteLine(); Console::WriteLine( " * The value of String str1 is '{0}'.", str1 ); Console::WriteLine( " * The value of StringBuilder sb is '{0}'.", sb ); Console::WriteLine(); Console::WriteLine( "1a) String::Equals(Object). Object is a StringBuilder, not a String." ); Console::WriteLine( " Is str1 equal to sb?: {0}", str1->Equals( sb ) ); Console::WriteLine(); Console::WriteLine( "1b) String::Equals(Object). Object is a String." ); str2 = sb->ToString(); o2 = str2; Console::WriteLine( " * The value of Object o2 is '{0}'.", o2 ); Console::WriteLine( " Is str1 equal to o2?: {0}", str1->Equals( o2 ) ); Console::WriteLine(); Console::WriteLine( " 2) String::Equals(String)" ); Console::WriteLine( " * The value of String str2 is '{0}'.", str2 ); Console::WriteLine( " Is str1 equal to str2?: {0}", str1->Equals( str2 ) ); Console::WriteLine(); Console::WriteLine( " 3) String::Equals(String, String)" ); Console::WriteLine( " Is str1 equal to str2?: {0}", String::Equals( str1, str2 ) ); } /* This example produces the following results: * The value of String str1 is 'abcd'. * The value of StringBuilder sb is 'abcd'. 1a) String::Equals(Object). Object is a StringBuilder, not a String. Is str1 equal to sb?: False 1b) String::Equals(Object). Object is a String. * The value of Object o2 is 'abcd'. Is str1 equal to o2?: True 2) String::Equals(String) * The value of String str2 is 'abcd'. Is str1 equal to str2?: True 3) String::Equals(String, String) Is str1 equal to str2?: True */ // Sample for String.Equals(Object) // String.Equals(String) // String.Equals(String, String) using System; using System.Text; class Sample { public static void Main() { StringBuilder sb = new StringBuilder("abcd"); String str1 = "abcd"; String str2 = null; Object o2 = null; Console.WriteLine(); Console.WriteLine(" * The value of String str1 is '{0}'.", str1); Console.WriteLine(" * The value of StringBuilder sb is '{0}'.", sb.ToString()); Console.WriteLine(); Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String."); Console.WriteLine(" Is str1 equal to sb?: {0}", str1.Equals(sb)); Console.WriteLine(); Console.WriteLine("1b) String.Equals(Object). Object is a String."); str2 = sb.ToString(); o2 = str2; Console.WriteLine(" * The value of Object o2 is '{0}'.", o2); Console.WriteLine(" Is str1 equal to o2?: {0}", str1.Equals(o2)); Console.WriteLine(); Console.WriteLine(" 2) String.Equals(String)"); Console.WriteLine(" * The value of String str2 is '{0}'.", str2); Console.WriteLine(" Is str1 equal to str2?: {0}", str1.Equals(str2)); Console.WriteLine(); Console.WriteLine(" 3) String.Equals(String, String)"); Console.WriteLine(" Is str1 equal to str2?: {0}", String.Equals(str1, str2)); } } /* This example produces the following results: * The value of String str1 is 'abcd'. * The value of StringBuilder sb is 'abcd'. 1a) String.Equals(Object). Object is a StringBuilder, not a String. Is str1 equal to sb?: False 1b) String.Equals(Object). Object is a String. * The value of Object o2 is 'abcd'. Is str1 equal to o2?: True 2) String.Equals(String) * The value of String str2 is 'abcd'. Is str1 equal to str2?: True 3) String.Equals(String, String) Is str1 equal to str2?: True */ ' Sample for String.Equals(Object) ' String.Equals(String) ' String.Equals(String, String) Imports System.Text Class Sample Public Shared Sub Main() Dim sb As New StringBuilder("abcd") Dim str1 As [String] = "abcd" Dim str2 As [String] = Nothing Dim o2 As [Object] = Nothing Console.WriteLine() Console.WriteLine(" * The value of String str1 is '{0}'.", str1) Console.WriteLine(" * The value of StringBuilder sb is '{0}'.", sb.ToString()) Console.WriteLine() Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String.") Console.WriteLine(" Is str1 equal to sb?: {0}", str1.Equals(sb)) Console.WriteLine() Console.WriteLine("1b) String.Equals(Object). Object is a String.") str2 = sb.ToString() o2 = str2 Console.WriteLine(" * The value of Object o2 is '{0}'.", o2) Console.WriteLine(" Is str1 equal to o2?: {0}", str1.Equals(o2)) Console.WriteLine() Console.WriteLine(" 2) String.Equals(String)") Console.WriteLine(" * The value of String str2 is '{0}'.", str2) Console.WriteLine(" Is str1 equal to str2?: {0}", str1.Equals(str2)) Console.WriteLine() Console.WriteLine(" 3) String.Equals(String, String)") Console.WriteLine(" Is str1 equal to str2?: {0}", [String].Equals(str1, str2)) End Sub End Class ' 'This example produces the following results: ' ' * The value of String str1 is 'abcd'. ' * The value of StringBuilder sb is 'abcd'. ' '1a) String.Equals(Object). Object is a StringBuilder, not a String. ' Is str1 equal to sb?: False ' '1b) String.Equals(Object). Object is a String. ' * The value of Object o2 is 'abcd'. ' Is str1 equal to o2?: True ' ' 2) String.Equals(String) ' * The value of String str2 is 'abcd'. ' Is str1 equal to str2?: True ' ' 3) String.Equals(String, String) ' Is str1 equal to str2?: True '설명
이 메서드는 서 수 (대/소문자 구분 및 문화권을 구분 하지 않는) 비교를 수행 합니다.
추가 정보
- Object
- CompareOrdinal(String, String)
적용 대상
Equals(String)
이 인스턴스와 지정한 다른 String 개체의 값이 같은지를 확인합니다.
public: virtual bool Equals(System::String ^ value);public: bool Equals(System::String ^ value);public bool Equals (string value);public bool Equals (string? value);override this.Equals : string -> boolPublic Function Equals (value As String) As Boolean매개 변수
value String
이 인스턴스와 비교할 문자열입니다.
반환
Booleantrue 매개 변수와 이 인스턴스의 값이 같으면 value이고, 그러지 않으면 false입니다. value가 null이면 메서드에서 false을 반환합니다.
구현
예제
다음 예제는 Equals 메서드. 이는 제목 대/소문자 단어 "File"과 해당 단어, 소문자, 대문자 및 라틴어 소문자 I (U + 0069) 대신 라틴어 소문자 점 (u + 0131)을 포함 하는 단어를 비교 합니다. Equals(String)이 메서드는 서 수 비교를 수행 하기 때문에 동일한 단어가 포함 된 비교만 반환 true 합니다.
using System; public class Example { public static void Main() { Console.OutputEncoding = System.Text.Encoding.UTF8; string word = "File"; string[] others = { word.ToLower(), word, word.ToUpper(), "Fıle" }; foreach (string other in others) { if (word.Equals(other)) Console.WriteLine("{0} = {1}", word, other); else Console.WriteLine("{0} {1} {2}", word, '\u2260', other); } } } // The example displays the following output: // File ≠ file // File = File // File ≠ FILE // File ≠ Fıle Module Example Public Sub Main() Console.OutputEncoding = System.Text.Encoding.UTF8 Dim word As String = "File" Dim others() As String = { word.ToLower(), word, word.ToUpper(), _ "Fıle" } For Each other As String In others If word.Equals(other) Then Console.WriteLine("{0} = {1}", word, other) Else Console.WriteLine("{0} {1} {2}", word, ChrW(&H2260), other) End If Next End Sub End Module ' The example displays the following output: ' File ≠ file ' File = File ' File ≠ FILE ' File ≠ Fıle설명
이 메서드는 서 수 (대/소문자 구분 및 문화권을 구분 하지 않는) 비교를 수행 합니다.
추가 정보
- CompareOrdinal(String, String)