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

Tanım

Geçerli Tuple<T1,T2,T3,T4,T5,T6> nesnenin belirtilen bir karşılaştırma yöntemine göre belirtilen bir nesneye eşit olup olmadığını gösteren bir değer döndürür.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

Parametreler

other
Object

Örnekle karşılaştırılacak nesne.The object to compare with this instance.

comparer
IEqualityComparer

İki nesnenin eşit olup olmadığını değerlendirmek için kullanılacak yöntemi tanımlayan nesne.An object that defines the method to use to evaluate whether the two objects are equal.

Döndürülenler

Boolean

true geçerli örnek belirtilen nesneye eşitse; Aksi takdirde, false .true if the current instance is equal to the specified object; otherwise, false.

Uygulamalar

Örnekler

Aşağıdaki örnek, RateComparer eşitlik için özel bir test gerçekleştiren bir sınıfı tanımlar.The following example defines a RateComparer class that performs a custom test for equality. Yöntemine geçirilen değerler IStructuralEquatable.Equals veya türünde ise Single Double , yöntemi yalnızca en fazla üç kesirli basamak kullanarak eşitlik için test eder.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. Aksi takdirde, yalnızca x parametrenin Equals yöntemini çağırır.Otherwise, it simply calls the x parameter's Equals method. Örnek, IEqualityComparer Tuple<T1,T2,T3,T4,T5,T6> 1960 ve 2000 arasındaki popülasyon değişikliği oranı üzerinde veri içeren dört nesnenin eşit olup olmadığını anlamak için bu uygulamayı kullanır.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

Açıklamalar

Bu üye, açık bir arabirim üyesi uygulamasıdır.This member is an explicit interface member implementation. Bu, yalnızca Tuple<T1,T2,T3,T4,T5,T6> örnek bir arabirime yayınlandığınızda kullanılabilir IStructuralEquatable .It can be used only when the Tuple<T1,T2,T3,T4,T5,T6> instance is cast to an IStructuralEquatable interface.

IEqualityComparer.EqualsUygulama yalnızca other , yoksa null ve başarıyla Dönüştürülebileceğinden (C# ' ta) veya (Visual Basic), Tuple<T1,T2,T3,T4,T5,T6> bileşenleri geçerli örnekle aynı türden olan bir nesneye dönüştürülürse çağrılır.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. IStructuralEquatable.Equals(Object, IEqualityComparer)Yöntemi öncelikle Item1 Tuple<T1,T2,T3,T4,T5,T6> uygulamayla Karşılaştırılacak nesne değerlerini geçirir IEqualityComparer.Equals .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. Bu yöntem çağrısı döndürürse true , yöntemi yeniden çağrılır ve Item2 iki nesnenin değerlerini geçti Tuple<T1,T2,T3,T4,T5,T6> .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. Bu, yöntem çağrısı false belirli bir değer çiftiyle karşılaştırılana kadar devam eder Item veya iki Item6 değer yöntemine geçirilir.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.

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