Tuple<T1,T2,T3,T4,T5,T6>.IStructuralEquatable.Equals(Object, IEqualityComparer) Método

Definición

Devuelve un valor que indica si el objeto Tuple<T1,T2,T3,T4,T5,T6> actual es igual que el objeto especificado según el método de comparación especificado.Returns a value that indicates whether the current Tuple<T1,T2,T3,T4,T5,T6> object is equal to a specified object based on a specified comparison method.

 virtual bool System.Collections.IStructuralEquatable.Equals(System::Object ^ other, System::Collections::IEqualityComparer ^ comparer) = System::Collections::IStructuralEquatable::Equals;
bool IStructuralEquatable.Equals (object other, System.Collections.IEqualityComparer comparer);
abstract member System.Collections.IStructuralEquatable.Equals : obj * System.Collections.IEqualityComparer -> bool
override this.System.Collections.IStructuralEquatable.Equals : obj * System.Collections.IEqualityComparer -> bool
Function Equals (other As Object, comparer As IEqualityComparer) As Boolean Implements IStructuralEquatable.Equals

Parámetros

other
Object

Objeto que se va a comparar con esta instancia.The object to compare with this instance.

comparer
IEqualityComparer

Un objeto que define el método que se usará para evaluar si los dos objetos son iguales.An object that defines the method to use to evaluate whether the two objects are equal.

Devoluciones

Boolean

true si la instancia actual es igual que el objeto especificado; en caso contrario, false.true if the current instance is equal to the specified object; otherwise, false.

Implementaciones

Ejemplos

En el ejemplo siguiente se define una RateComparer clase que realiza una prueba personalizada para determinar si son iguales.The following example defines a RateComparer class that performs a custom test for equality. Si los valores que se pasan a su IStructuralEquatable.Equals método son del tipo Single o Double , el método comprueba la igualdad usando solo hasta tres dígitos fraccionarios.If the values that are passed to its IStructuralEquatable.Equals method are of type Single or Double, the method tests for equality by using only up to three fractional digits. De lo contrario, simplemente llama al x método del parámetro Equals .Otherwise, it simply calls the x parameter's Equals method. En el ejemplo se utiliza esta IEqualityComparer implementación para determinar si cuatro Tuple<T1,T2,T3,T4,T5,T6> objetos que contienen datos sobre la velocidad de cambio de población entre 1960 y 2000 son iguales.The example uses this IEqualityComparer implementation to determine whether four Tuple<T1,T2,T3,T4,T5,T6> objects that contain data on the rate of population change between 1960 and 2000 are equal.

using System;
using System.Collections;

public class RateComparer<T1, T2, T3, T4, T5, T6> : IEqualityComparer
{
   private int argument = 0;

   public new bool Equals(object x, object y) 
   {
      argument++;
      if (argument == 1) return true;

      double fx, fy; 
      if (x is Double || x is Single)
      {
            fx = (double) x;
            fy = (double) y;
            return Math.Round(fx * 1000).Equals(Math.Round(fy * 1000));
      }
      else
      {
         return x.Equals(y);
      }
   }
   
   public int GetHashCode(object obj)
   {
      if (obj is Single || obj is Double)
         return Math.Round(((double) obj) * 1000).GetHashCode();
      else
         return obj.GetHashCode();
   }                
}

public class Example
{
   public static void Main()
   {
      var rate1 = Tuple.Create("New York", .014505, -.1042733, 
                               .0354833, .093644, .0290792);
      var rate2 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .0290792);
      var rate3 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .029079);
      var rate4 = Tuple.Create("San Francisco", -.0332858, -.0512803, 
                               .0662544, .0728964, .0491912);
      IStructuralEquatable eq = rate1;
      // Compare first tuple with remaining two tuples.
      Console.WriteLine("{0} = ", rate1.ToString());
      Console.WriteLine("   {0} : {1}", rate2, 
                        eq.Equals(rate2, new RateComparer<string, double, double, double, double, double>()));
      Console.WriteLine("   {0} : {1}", rate3, 
                        eq.Equals(rate3, new RateComparer<string, double, double, double, double, double>()));
      Console.WriteLine("   {0} : {1}", rate4, 
                        eq.Equals(rate4, new RateComparer<string, double, double, double, double, double>()));
   }
}
// The example displays the following output:
//    (New York, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) =
//       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) : True
//       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.029079) : True
//       (San Francisco, -0.0332858, -0.0512803, 0.0662544, 0.0728964, 0.0491912) : False
Imports System.Collections

Public Class RateComparer(Of T1, T2, T3, T4, T5, T6) : Implements IEqualityComparer
   Private argument As Integer = 0

   Public Overloads Function Equals(x As Object, y As Object) As Boolean _
                   Implements IEqualityComparer.Equals
      argument += 1
      If argument = 1 Then
         Return True
      Else
         Dim fx, fy As Double
         If typeof x Is Double Or typeof x Is Single Then
            fx = CDbl(x)
            fy = CDbl(y)
            Return Math.Round(fx * 1000).Equals(Math.Round(fy * 1000))
         Else
            Return x.Equals(y)
         End If
      End If   
   End Function
   
   Public Overloads Function GetHashCode(obj As Object) As Integer _
                    Implements IEqualityComparer.GetHashCode
      If TypeOf(obj) Is Single Or TypeOf(obj) Is Double Then
         Return Math.Round(CDbl(obj) * 1000).GetHashCode()
      Else
         Return obj.GetHashCode()
      End If
   End Function                
End Class

Module Example
   Public Sub Main()
      Dim rate1 = Tuple.Create("New York", .014505, -.1042733, 
                               .0354833, .093644, .0290792)
      Dim rate2 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .0290792)
      Dim rate3 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .029079)
      Dim rate4 = Tuple.Create("San Francisco", -.0332858, -.0512803, 
                               .0662544, .0728964, .0491912)
      Dim eq As IStructuralEquatable = rate1
      ' Compare first tuple with remaining two tuples.
      Console.WriteLine("{0} = ", rate1.ToString())
      Console.WriteLine("   {0} : {1}", rate2, 
                        eq.Equals(rate2, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
      Console.WriteLine("   {0} : {1}", rate3, 
                        eq.Equals(rate3, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
      Console.WriteLine("   {0} : {1}", rate4, 
                        eq.Equals(rate4, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
   End Sub
End Module
' The example displays the following output:
'    (New York, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) =
'       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) : True
'       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.029079) : True
'       (San Francisco, -0.0332858, -0.0512803, 0.0662544, 0.0728964, 0.0491912) : False

Comentarios

Este miembro es una implementación explícita de un miembro de interfaz.This member is an explicit interface member implementation. Solo se puede utilizar cuando la instancia de Tuple<T1,T2,T3,T4,T5,T6> se convierte en una interfaz IStructuralEquatable.It can be used only when the Tuple<T1,T2,T3,T4,T5,T6> instance is cast to an IStructuralEquatable interface.

IEqualityComparer.EqualsSolo se llama a la implementación si other no es null y si puede convertirse correctamente (en C#) o convertirse (en Visual Basic) en un Tuple<T1,T2,T3,T4,T5,T6> objeto cuyos componentes son de los mismos tipos que la instancia actual.The IEqualityComparer.Equals implementation is called only if other is not null, and if it can be successfully cast (in C#) or converted (in Visual Basic) to a Tuple<T1,T2,T3,T4,T5,T6> object whose components are of the same types as the current instance. El IStructuralEquatable.Equals(Object, IEqualityComparer) método pasa primero los Item1 valores de los Tuple<T1,T2,T3,T4,T5,T6> objetos que se van a comparar con la IEqualityComparer.Equals implementación.The IStructuralEquatable.Equals(Object, IEqualityComparer) method first passes the Item1 values of the Tuple<T1,T2,T3,T4,T5,T6> objects to be compared to the IEqualityComparer.Equals implementation. Si esta llamada al método devuelve true , se llama de nuevo al método y se pasan los Item2 valores de los dos Tuple<T1,T2,T3,T4,T5,T6> objetos.If this method call returns true, the method is called again and passed the Item2 values of the two Tuple<T1,T2,T3,T4,T5,T6> objects. Esto continúa hasta que se devuelve la llamada al método false cuando compara un par específico de Item valores, o los dos Item6 valores se pasan al método.This continues until the method call returns false when it compares a specific pair of Item values, or the two Item6 values are passed to the method.

Se aplica a