Tuple<T1,T2>.IStructuralEquatable.Equals(Object, IEqualityComparer) 메서드

정의

지정된 비교 메서드를 기반으로 현재 Tuple<T1,T2> 개체가 지정된 개체와 같은지 여부를 나타내는 값을 반환합니다.Returns a value that indicates whether the current Tuple<T1,T2> 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

매개 변수

other
Object

이 인스턴스와 비교할 개체입니다.The object to compare with this instance.

comparer
IEqualityComparer

두 개체가 같은지 여부를 평가하는 데 사용할 방법을 정의하는 개체입니다.An object that defines the method to use to evaluate whether the two objects are equal.

반환

Boolean

현재 인스턴스가 지정된 개체와 같으면 true이고, 그렇지 않으면 false입니다.true if the current instance is equal to the specified object; otherwise, false.

구현

예제

다음 예제에서는 IEqualityComparer 인터페이스를 구현 하는 Item2Comparer 클래스를 정의 하 고 Tuple<T1,T2> 개체가 같은지 확인 하는 방식을 변경 합니다.The following example defines an Item2Comparer class that implements the IEqualityComparer interface and changes the way in which Tuple<T1,T2> objects are evaluated for equality. 메서드는 두 개의 Tuple<T1,T2> 개체의 Item1 속성 값이 전달 되 면 true를 항상 반환 하 고 IStructuralEquatable.Equals 메서드를 호출 하 여 Item2 속성 값을 평가 합니다.The method always returns true when it is passed the Item1 property values of two Tuple<T1,T2> objects, and it calls the IStructuralEquatable.Equals method to evaluate their Item2 property values. 결과적으로 메서드는 Item2 속성 값만 기반으로 같음을 테스트 합니다.As a result, the method tests for equality based only on the value of the Item2 property. 출력은 러너 이름 및 실행 한 거리를 기록 하는 Tuple<T1,T2> 개체의 데이터 집합에 대 한 결과를 보여 줍니다.The output illustrates the result for a data set of Tuple<T1,T2> objects that record the names of runners and the distances that they ran.

using System;
using System.Collections;

public class Item2Comparer<T1, T2> : IEqualityComparer
{
   new public bool Equals(object x, object y)
   {
      // Return true for all values of Item1.
      if (x is T1)
      //if (typeof(x) is string) 
         return true;
      else
         return x.Equals(y);
   }
   
   public int GetHashCode(object obj)
   {
      if (obj is T1)
         return ((T1) obj).GetHashCode();
      else
         return ((T2) obj).GetHashCode();
   }                
}

public class Example
{
   public static void Main()
   {
      Tuple<string, double>[] distancesWalked = {
                        Tuple.Create("Jan", Double.NaN), 
                        Tuple.Create("Joe", Double.NaN), 
                        Tuple.Create("Adam", 1.36), 
                        Tuple.Create("Selena", 2.01),
                        Tuple.Create("Jake", 1.36) };
      for (int ctr = 0; ctr < distancesWalked.Length; ctr++)
      {
         Tuple<string, double> distanceWalked = distancesWalked[ctr];
         for (int ctr2 = ctr + 1; ctr2 < distancesWalked.Length; ctr2++)
         {
            Console.WriteLine("{0} = {1}: {2}", distanceWalked, 
                              distancesWalked[ctr2], 
                              ((IStructuralEquatable)distanceWalked).Equals(distancesWalked[ctr2], 
                                                    new Item2Comparer<string, double>()));
         }
         Console.WriteLine();
      }   
   }
}
// The example displays the following output:
//       (Jan, NaN) = (Joe, NaN): True
//       (Jan, NaN) = (Adam, 1.36): False
//       (Jan, NaN) = (Selena, 2.01): False
//       (Jan, NaN) = (Jake, 1.36): False
//       
//       (Joe, NaN) = (Adam, 1.36): False
//       (Joe, NaN) = (Selena, 2.01): False
//       (Joe, NaN) = (Jake, 1.36): False
//       
//       (Adam, 1.36) = (Selena, 2.01): False
//       (Adam, 1.36) = (Jake, 1.36): True
//       
//       (Selena, 2.01) = (Jake, 1.36): False
Imports System.Collections

Public Class Item2Comparer(Of T1, T2) : Implements IEqualityComparer
   
   Public Overloads Function Equals(x As Object, y As Object) As Boolean _
                   Implements IEqualityComparer.Equals
      ' Return true for all values of Item1.
      If TypeOf x Is T1 Then
         Return True
      Else
         Return x.Equals(y)
      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()
      Else
         Return CType(obj, T2).GetHashCode()
      End If   
   End Function                
End Class

Module Example
   Public Sub Main()
      Dim distancesWalked() = {
                        Tuple.Create("Jan", Double.NaN), 
                        Tuple.Create("Joe", Double.NaN), 
                        Tuple.Create("Adam", 1.36), 
                        Tuple.Create("Selena", 2.01),
                        Tuple.Create("Jake", 1.36) }
      For ctr As Integer = 0 To distancesWalked.Length - 1
         Dim distanceWalked As Tuple(Of String, Double) = distancesWalked(ctr)
         For ctr2 As Integer = ctr + 1 To distancesWalked.Length - 1
            Console.WriteLine("{0} = {1}: {2}", distanceWalked, 
                              distancesWalked(ctr2), 
                              DirectCast(distanceWalked, IStructuralEquatable).Equals(distancesWalked(ctr2), 
                                                    new Item2Comparer(Of String, Double)))
         Next
         Console.WriteLine()
      Next                     
   End Sub
End Module
' The example displays the following output:
'       (Jan, NaN) = (Joe, NaN): True
'       (Jan, NaN) = (Adam, 1.36): False
'       (Jan, NaN) = (Selena, 2.01): False
'       (Jan, NaN) = (Jake, 1.36): False
'       
'       (Joe, NaN) = (Adam, 1.36): False
'       (Joe, NaN) = (Selena, 2.01): False
'       (Joe, NaN) = (Jake, 1.36): False
'       
'       (Adam, 1.36) = (Selena, 2.01): False
'       (Adam, 1.36) = (Jake, 1.36): True
'       
'       (Selena, 2.01) = (Jake, 1.36): False

설명

이 멤버는 명시적인 인터페이스 멤버 구현입니다.This member is an explicit interface member implementation. Tuple<T1,T2> 인스턴스가 IStructuralEquatable 인터페이스로 캐스팅된 경우에만 사용할 수 있습니다.It can be used only when the Tuple<T1,T2> instance is cast to an IStructuralEquatable interface.

IStructuralEquatable.Equals 구현은 othernull되지 않은 경우, 구성 요소가 현재 인스턴스와 동일한 유형인 Tuple<T1,T2> 개체로 성공적으로 캐스팅 ( C#또는 Visual Basic) 할 수 있는 경우에만 호출 됩니다.The IStructuralEquatable.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> object whose components are of the same types as the current instance. IStructuralEquatable.Equals 메서드는 먼저 IEqualityComparer.Equals 구현과 비교할 Tuple<T1,T2> 개체의 Item1 값을 전달 합니다.The IStructuralEquatable.Equals method first passes the Item1 values of the Tuple<T1,T2> objects to be compared to the IEqualityComparer.Equals implementation. 이 메서드 호출이 true반환 하는 경우 메서드가 다시 호출 되 고 두 Tuple<T1,T2> 개체의 Item2 값이 전달 됩니다.If this method call returns true, the method is called again and passed the Item2 values of the two Tuple<T1,T2> objects.

적용 대상

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