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

Definição

Retorna um valor que indica se o objeto Tuple<T1,T2,T3,T4,T5> atual é igual ao objeto especificado com base em um determinado método de comparação.Returns a value that indicates whether the current Tuple<T1,T2,T3,T4,T5> 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

Parâmetros

other
Object

O objeto a ser comparado com essa instância.The object to compare with this instance.

comparer
IEqualityComparer

Um objeto que define o método a ser usado para avaliar se dois objetos são iguais.An object that defines the method to use to evaluate whether the two objects are equal.

Retornos

Boolean

true caso a instância atual seja igual ao objeto especificado; do contrário, false.true if the current instance is equal to the specified object; otherwise, false.

Implementações

Exemplos

O exemplo a seguir define uma classe DoubleComparer que implementa a interface IEqualityComparer.The following example defines a DoubleComparer class that implements the IEqualityComparer interface. O exemplo instancia dois Tuple<T1,T2,T3,T4,T5> objetos usando um gerador de números aleatórios para popular o segundo por meio de cinco componentes, converte a primeira instância em uma IStructuralEquatable interface e, em seguida, usa um DoubleComparer objeto para testar os dois Tuple<T1,T2,T3,T4,T5> objetos para uma igualdade aproximada.The example instantiates two Tuple<T1,T2,T3,T4,T5> objects by using a random number generator to populate their second through fifth components, casts the first instance to an IStructuralEquatable interface, and then uses a DoubleComparer object to test the two Tuple<T1,T2,T3,T4,T5> objects for approximate equality.

using System;
using System.Collections;

public class DoubleComparer<T1, T2, T3, T4, T5> : IEqualityComparer
{
   private double difference;
   private int argument = 0;
   
   public DoubleComparer(double difference)
   {
      this.difference = difference;
   }
   
   new public bool Equals(object x, object y)
   { 
      argument += 1;
      
      // Return true for Item1.
      if (argument == 1) return true;

      double d1 = (double) x;
      double d2 = (double) y;

      if (d1 - d2 < d1 * difference)
         return true;
      else            
         return false;
   }
   
   public int GetHashCode(object obj)
   {
      if (obj is T1)
         return ((T1) obj).GetHashCode();
      else if (obj is T2)
         return ((T2) obj).GetHashCode();
      else if (obj is T3)
         return ((T3) obj).GetHashCode();
      else if (obj is T4)
         return ((T4) obj).GetHashCode();
      else
         return ((T5) obj).GetHashCode();   
   }
}

public class Example
{
   public static void Main()
   {
      var value1 = GetValues(1);
      var value2 = GetValues(2);
      IStructuralEquatable iValue1 = value1;
      Console.WriteLine("{0} =\n{1} :\n{2}", value1, value2, 
                        iValue1.Equals(value2, 
                        new DoubleComparer<int, double, double, double, double>(.01)));
   }

   private static Tuple<int, double, double, double, double> GetValues(int ctr)
   {
      // Generate four random numbers between 0 and 1
      Random rnd = new Random((int)DateTime.Now.Ticks >> 32 >> ctr);
      return Tuple.Create(ctr, rnd.NextDouble(), rnd.NextDouble(), 
                          rnd.NextDouble(), rnd.NextDouble());
   }                                   
}
Imports System.Collections

Public Class DoubleComparer(Of T1, T2, T3, T4, T5) : Implements IEqualityComparer
   Private difference As Double
   Private argument As Integer = 0
   
   Public Sub New(difference As Double)
      Me.difference = difference
   End Sub
   
   Public Overloads Function Equals(x As Object, y As Object) As Boolean _
                   Implements IEqualityComparer.Equals
      argument += 1
      
      ' Return true for Item1.
      If argument = 1 Then
         Return True
      Else
         Dim d1 As Double = CDbl(x)
         Dim d2 As Double = CDbl(y)
         If d1 - d2 < d1 * difference Then
            Return True
         Else            
            Return False
         End If
      End If
   End Function
   
   Public Overloads Function GetHashCode(obj As Object) As Integer _
                    Implements IEqualityComparer.GetHashCode
      If TypeOf obj Is T1 Then
         Return CType(obj, T1).GetHashCode()
      ElseIf TypeOf obj Is T2 Then
         Return CType(obj, T2).GetHashCode()
      ElseIf TypeOf obj Is T3 Then
         Return CType(Obj, T3).GetHashCode()
      ElseIf TypeOf obj Is T4 Then
         Return CType(Obj, T4).GetHashCode()
      Else	
         Return CType(obj, T5).GetHashCode()
      End If
   End Function                
End Class

Module Example
   Public Sub Main()
      Dim value1 = GetValues(1)
      Dim value2 = GetValues(2)
      Dim iValue1 As IStructuralEquatable = value1
      Console.WriteLine("{0} ={3}{1} :{3}{2}", value1, value2, _
                        iValue1.Equals(value2, _
                        New DoubleComparer(Of Integer, Double, Double, Double, Double)(.01)), _
                        vbCrLf)
   End Sub
   
   Private Function GetValues(ctr As Integer) As Tuple(Of Integer, Double, Double, Double, Double)
      ' Generate four random numbers between 0 and 1
      Dim rnd As New Random(CInt((DateTime.Now.Ticks >> 32) >> ctr))
      Return Tuple.Create(ctr, rnd.NextDouble(), rnd.NextDouble(), 
                          rnd.NextDouble(), rnd.NextDouble)
   End Function                                   
End Module
' The example displays output like the following:
'    (1, 0.910850029862882, 0.894596965934428, 0.319678635019659, 0.801647342649124) =
'    (2, 0.818546649915421, 0.355961162762698, 0.0438506622071614, 0.679904267042831) :
'    False

Comentários

Este membro é uma implementação do membro de interface explícita.This member is an explicit interface member implementation. Ele só pode ser usado quando a instância de Tuple<T1,T2,T3,T4,T5> é convertida em uma interface de IStructuralEquatable.It can be used only when the Tuple<T1,T2,T3,T4,T5> instance is cast to an IStructuralEquatable interface.

A IEqualityComparer.Equals implementação é chamada somente se other não for null , e se ela puder ser convertida com êxito (em C#) ou convertido (em Visual Basic) em um Tuple<T1,T2,T3,T4,T5> objeto cujos componentes são dos mesmos tipos que a instância atual.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> object whose components are of the same types as the current instance. O IStructuralEquatable.Equals(Object, IEqualityComparer) método primeiro passa os Item1 valores dos Tuple<T1,T2,T3,T4,T5> objetos para serem comparados com a IEqualityComparer.Equals implementação.The IStructuralEquatable.Equals(Object, IEqualityComparer) method first passes the Item1 values of the Tuple<T1,T2,T3,T4,T5> objects to be compared to the IEqualityComparer.Equals implementation. Se essa chamada de método retornar true , o método será chamado novamente e passará os Item2 valores dos dois Tuple<T1,T2,T3,T4,T5> 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> objects. Isso continuará até que a chamada de método seja retornada false ao comparar um par de Item valores específico ou que os dois Item5 valores sejam passados para o método.This continues until the method call returns false when it compares a specific pair of Item values, or the two Item5 values are passed to the method.

Aplica-se a