String.Equals Método

Referencia

Definición

Espacio de nombres:: System

Ensamblado:: System.Runtime.dll

Ensamblado:: netstandard.dll

Ensamblado:: mscorlib.dll

Importante

Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.

Determina si dos objetos String tienen el mismo valor.

Sobrecargas

Equals(String, StringComparison)	Determina si esta cadena y un objeto String especificado tienen el mismo valor. Un parámetro especifica la referencia cultural, el uso de mayúsculas y minúsculas, así como las reglas de ordenación usadas en la comparación.
Equals(String, String)	Determina si dos objetos String especificados tienen el mismo valor.
Equals(String, String, StringComparison)	Determina si dos objetos String especificados tienen el mismo valor. Un parámetro especifica la referencia cultural, el uso de mayúsculas y minúsculas, así como las reglas de ordenación usadas en la comparación.
Equals(Object)	Determina si esta instancia y un objeto especificado, que también debe ser un objeto String, tienen el mismo valor.
Equals(String)	Determina si esta instancia y otro objeto String especificado tienen el mismo valor.

Equals(String, StringComparison)

Determina si esta cadena y un objeto String especificado tienen el mismo valor. Un parámetro especifica la referencia cultural, el uso de mayúsculas y minúsculas, así como las reglas de ordenación usadas en la comparación.

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 -> bool

Public Function Equals (value As String, comparisonType As StringComparison) As Boolean

Parámetros

value: String

Cadena que se va a comparar con esta instancia.

comparisonType: StringComparison

Uno de los valores de enumeración que especifica cómo se compararán las cadenas.

Devoluciones

Boolean

Es true si el valor del parámetro value es el mismo que el de esta cadena; en caso contrario, es false.

Excepciones

ArgumentException

comparisonType no es un valor StringComparison.

Ejemplos

En el ejemplo siguiente se crea una matriz de cadenas que consta de una "I" mayúscula, una "i" minúscula y una "ntes" sin puntos. A continuación, llama Equals(String, StringComparison) al método para compararlos mediante cada valor de StringComparison enumeración posible.

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): False

En el ejemplo siguiente se comparan cuatro conjuntos de palabras mediante cada miembro de la StringComparison enumeración . Las comparaciones usan las convenciones de las culturas inglés (Estados Unidos) y Sami (Alta Noruega). Tenga en cuenta que las cadenas "encycteria" y "encyclopaedia" se consideran equivalentes en la referencia cultural en-US, pero no en la referencia cultural Sami (Irlanda del Norte).

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): True

Comentarios

El parámetro indica si la comparación debe usar la referencia cultural actual o invariable, respetar u omitir el caso de las dos cadenas que se comparan, o usar reglas de ordenación de palabras o comparisonType ordinales.

Consulte también

CompareOrdinal(String, String)

Se aplica a

Equals(String, String)

Determina si dos objetos String especificados tienen el mismo valor.

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 -> bool

Public Shared Function Equals (a As String, b As String) As Boolean

Parámetros

a: String

Primera cadena que se va a comparar, o null.

b: String

Segunda cadena que se va a comparar, o null.

Devoluciones

Boolean

true si el valor de a es el mismo que el valor de b; en caso contrario, false. Si tanto a como b son null, el método devuelve true.

Ejemplos

En el siguiente ejemplo se muestra el Equals método.

// 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
'

Comentarios

Este método realiza una comparación ordinal (que distingue mayúsculas de minúsculas y no distingue la referencia cultural).

Consulte también

CompareOrdinal(String, String)

Se aplica a

Equals(String, String, StringComparison)

Determina si dos objetos String especificados tienen el mismo valor. Un parámetro especifica la referencia cultural, el uso de mayúsculas y minúsculas, así como las reglas de ordenación usadas en la comparación.

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 -> bool

Public Shared Function Equals (a As String, b As String, comparisonType As StringComparison) As Boolean

Parámetros

a: String

Primera cadena que se va a comparar, o null.

b: String

Segunda cadena que se va a comparar, o null.

comparisonType: StringComparison

Uno de los valores de enumeración que especifica las reglas de la comparación.

Devoluciones

Boolean

Es true si el valor del parámetro a es igual que el valor del parámetro b; en caso contrario, es false.

Excepciones

ArgumentException

comparisonType no es un valor StringComparison.

Ejemplos

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): True

Comentarios

Consulte también

CompareOrdinal(String, String)

Se aplica a

Equals(Object)

Determina si esta instancia y un objeto especificado, que también debe ser un objeto String, tienen el mismo valor.

public:
 override bool Equals(System::Object ^ obj);

public override bool Equals (object obj);

public override bool Equals (object? obj);

override this.Equals : obj -> bool

Public Overrides Function Equals (obj As Object) As Boolean

Parámetros

obj: Object

Cadena que se va a comparar con esta instancia.

Devoluciones

Boolean

Es true si obj es un objeto String y tiene el mismo valor que esta instancia; en caso contrario, es false. Si el valor de obj es null, el método devuelve false.

Ejemplos

En el siguiente ejemplo se muestra el Equals método.

// 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
'

Comentarios

Este método realiza una comparación ordinal (que distingue mayúsculas de minúsculas y no distingue la referencia cultural).

Consulte también

Se aplica a

Equals(String)

Determina si esta instancia y otro objeto String especificado tienen el mismo valor.

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 -> bool

Public Function Equals (value As String) As Boolean

Parámetros

value: String

Cadena que se va a comparar con esta instancia.

Devoluciones

Boolean

Es true si el valor del parámetro value es el mismo que el de esta instancia; en caso contrario, es false. Si el valor de value es null, el método devuelve false.

Implementaciones

Equals(T)

Ejemplos

En el siguiente ejemplo se muestra el Equals método. Compara la palabra con mayúsculas y minúsculas "File" con una palabra equivalente, su equivalente en minúsculas, su equivalente en mayúsculas y una palabra que contiene LATIN SMALL LETTER DOTLESS I (U+0131) en lugar de LATIN SMALL LETTER I (U+0069). Dado que Equals(String) el método realiza una comparación ordinal, solo la comparación con una palabra idéntica devuelve true .

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 ≠ Fıle

Comentarios

Este método realiza una comparación ordinal (que distingue mayúsculas de minúsculas y no distingue la referencia cultural).

Consulte también

CompareOrdinal(String, String)

Se aplica a