Tuple<T1,T2,T3>.IStructuralEquatable.Equals Metode
Definisi
Penting
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Mengembalikan nilai yang menunjukkan apakah objek saat ini Tuple<T1,T2,T3> sama dengan objek tertentu berdasarkan metode perbandingan yang ditentukan.
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 -> boolFunction Equals (other As Object, comparer As IEqualityComparer) As Boolean Implements IStructuralEquatable.EqualsParameter
- other
- Object
Objek untuk dibandingkan dengan instans ini.
- comparer
- IEqualityComparer
Objek yang menentukan metode yang akan digunakan untuk mengevaluasi apakah kedua objek sama.
Mengembalikan
true jika instans saat ini sama dengan objek yang ditentukan; jika tidak, false.
Penerapan
Contoh
Contoh berikut mendefinisikan Item2Comparer kelas yang mengimplementasikan IEqualityComparer antarmuka dan mengubah cara Tuple<T1,T2,T3> objek dievaluasi untuk kesetaraan. Metode selalu mengembalikan true ketika diteruskan nilai Item1 properti dari dua Tuple<T1,T2,T3> objek, dan memanggil Tuple<T1,T2,T3>.IStructuralEquatable.Equals metode untuk mengevaluasi nilai propertinya Item2 . Jika panggilan metode ini mengembalikan true, nilai propertinya Item3 diteruskan ke metode , yang selalu mengembalikan true. Akibatnya, metode menguji kesetaraan hanya berdasarkan nilai Item2 properti. Output mengilustrasikan hasil untuk kumpulan Tuple<T1,T2,T3> data objek yang merekam nama, skor pengujian rata-rata, dan jumlah pengujian siswa di kelas.
using System;
using System.Collections;
public class Item2Comparer<T1, T2, T3> : IEqualityComparer
{
new public bool Equals(object x, object y)
{
// Return true for all values of Item1.
if (x is T1)
return true;
else if (x is T2)
return x.Equals(y);
else
return true;
}
public int GetHashCode(object obj)
{
if (obj is T1)
return ((T1) obj).GetHashCode();
else if (obj is T2)
return ((T2) obj).GetHashCode();
else
return ((T3) obj).GetHashCode();
}
}
public class Example
{
public static void Main()
{
Tuple<string, double, int>[] scores =
{ Tuple.Create("Ed", 78.8, 8),
Tuple.Create("Abbey", 92.1, 9),
Tuple.Create("Jim", 71.2, 9),
Tuple.Create("Sam", 91.7, 8),
Tuple.Create("Sandy", 71.2, 5),
Tuple.Create("Penelope", 82.9, 8),
Tuple.Create("Serena", 71.2, 9),
Tuple.Create("Judith", 84.3, 9) };
for (int ctr = 0; ctr < scores.Length; ctr++)
{
IStructuralEquatable score = scores[ctr];
for (int ctr2 = ctr + 1; ctr2 < scores.Length; ctr2++)
{
Console.WriteLine("{0} = {1}: {2}", score,
scores[ctr2],
score.Equals(scores[ctr2],
new Item2Comparer<string, double, int>()));
}
Console.WriteLine();
}
}
}
// The example displays the following output:
// (Ed, 78.8, 8) = (Abbey, 92.1, 9): False
// (Ed, 78.8, 8) = (Jim, 71.2, 9): False
// (Ed, 78.8, 8) = (Sam, 91.7, 8): False
// (Ed, 78.8, 8) = (Sandy, 71.2, 5): False
// (Ed, 78.8, 8) = (Penelope, 82.9, 8): False
// (Ed, 78.8, 8) = (Serena, 71.2, 9): False
// (Ed, 78.8, 8) = (Judith, 84.3, 9): False
//
// (Abbey, 92.1, 9) = (Jim, 71.2, 9): False
// (Abbey, 92.1, 9) = (Sam, 91.7, 8): False
// (Abbey, 92.1, 9) = (Sandy, 71.2, 5): False
// (Abbey, 92.1, 9) = (Penelope, 82.9, 8): False
// (Abbey, 92.1, 9) = (Serena, 71.2, 9): False
// (Abbey, 92.1, 9) = (Judith, 84.3, 9): False
//
// (Jim, 71.2, 9) = (Sam, 91.7, 8): False
// (Jim, 71.2, 9) = (Sandy, 71.2, 5): True
// (Jim, 71.2, 9) = (Penelope, 82.9, 8): False
// (Jim, 71.2, 9) = (Serena, 71.2, 9): True
// (Jim, 71.2, 9) = (Judith, 84.3, 9): False
//
// (Sam, 91.7, 8) = (Sandy, 71.2, 5): False
// (Sam, 91.7, 8) = (Penelope, 82.9, 8): False
// (Sam, 91.7, 8) = (Serena, 71.2, 9): False
// (Sam, 91.7, 8) = (Judith, 84.3, 9): False
//
// (Sandy, 71.2, 5) = (Penelope, 82.9, 8): False
// (Sandy, 71.2, 5) = (Serena, 71.2, 9): True
// (Sandy, 71.2, 5) = (Judith, 84.3, 9): False
//
// (Penelope, 82.9, 8) = (Serena, 71.2, 9): False
// (Penelope, 82.9, 8) = (Judith, 84.3, 9): False
//
// (Serena, 71.2, 9) = (Judith, 84.3, 9): False
open System
open System.Collections
type Item2Comparer<'T1, 'T2, 'T3 when 'T1: equality and 'T2: equality and 'T3: equality>() =
interface IEqualityComparer with
member _.Equals(x: obj, y: obj) =
// Return true for all values of Item1.
match x with
| :? 'T1 ->
true
| :? 'T2 ->
x.Equals y
| _ -> true
member _.GetHashCode(obj: obj) =
match obj with
| :? 'T1 as obj->
obj.GetHashCode()
| :? 'T2 as obj ->
obj.GetHashCode()
| _ ->
(obj :?> 'T3).GetHashCode()
let scores =
[| Tuple.Create("Ed", 78.8, 8)
Tuple.Create("Abbey", 92.1, 9)
Tuple.Create("Jim", 71.2, 9)
Tuple.Create("Sam", 91.7, 8)
Tuple.Create("Sandy", 71.2, 5)
Tuple.Create("Penelope", 82.9, 8)
Tuple.Create("Serena", 71.2, 9)
Tuple.Create("Judith", 84.3, 9) |]
for ctr = 0 to scores.Length - 1 do
let score : IStructuralEquatable = scores[ctr]
for ctr2 = ctr + 1 to scores.Length - 1 do
printfn $"{score} = {scores[ctr2]}: {score.Equals(scores[ctr2], Item2Comparer<string, double, int>())}"
printfn ""
// The example displays the following output:
// (Ed, 78.8, 8) = (Abbey, 92.1, 9): False
// (Ed, 78.8, 8) = (Jim, 71.2, 9): False
// (Ed, 78.8, 8) = (Sam, 91.7, 8): False
// (Ed, 78.8, 8) = (Sandy, 71.2, 5): False
// (Ed, 78.8, 8) = (Penelope, 82.9, 8): False
// (Ed, 78.8, 8) = (Serena, 71.2, 9): False
// (Ed, 78.8, 8) = (Judith, 84.3, 9): False
//
// (Abbey, 92.1, 9) = (Jim, 71.2, 9): False
// (Abbey, 92.1, 9) = (Sam, 91.7, 8): False
// (Abbey, 92.1, 9) = (Sandy, 71.2, 5): False
// (Abbey, 92.1, 9) = (Penelope, 82.9, 8): False
// (Abbey, 92.1, 9) = (Serena, 71.2, 9): False
// (Abbey, 92.1, 9) = (Judith, 84.3, 9): False
//
// (Jim, 71.2, 9) = (Sam, 91.7, 8): False
// (Jim, 71.2, 9) = (Sandy, 71.2, 5): True
// (Jim, 71.2, 9) = (Penelope, 82.9, 8): False
// (Jim, 71.2, 9) = (Serena, 71.2, 9): True
// (Jim, 71.2, 9) = (Judith, 84.3, 9): False
//
// (Sam, 91.7, 8) = (Sandy, 71.2, 5): False
// (Sam, 91.7, 8) = (Penelope, 82.9, 8): False
// (Sam, 91.7, 8) = (Serena, 71.2, 9): False
// (Sam, 91.7, 8) = (Judith, 84.3, 9): False
//
// (Sandy, 71.2, 5) = (Penelope, 82.9, 8): False
// (Sandy, 71.2, 5) = (Serena, 71.2, 9): True
// (Sandy, 71.2, 5) = (Judith, 84.3, 9): False
//
// (Penelope, 82.9, 8) = (Serena, 71.2, 9): False
// (Penelope, 82.9, 8) = (Judith, 84.3, 9): False
//
// (Serena, 71.2, 9) = (Judith, 84.3, 9): False
Imports System.Collections
Public Class Item2Comparer(Of T1, T2, T3) : 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
ElseIf TypeOf x Is T2 Then
Return x.Equals(y)
Else
Return True
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()
Else
Return CType(obj, T3).GetHashCode()
End If
End Function
End Class
Module Example
Public Sub Main()
Dim scores() =
{ Tuple.Create("Ed", 78.8, 8),
Tuple.Create("Abbey", 92.1, 9),
Tuple.Create("Jim", 71.2, 9),
Tuple.Create("Sam", 91.7, 8),
Tuple.Create("Sandy", 71.2, 5),
Tuple.Create("Penelope", 82.9, 8),
Tuple.Create("Serena", 71.2, 9),
Tuple.Create("Judith", 84.3, 9) }
For ctr As Integer = 0 To scores.Length - 1
Dim score As IStructuralEquatable = scores(ctr)
For ctr2 As Integer = ctr + 1 To scores.Length - 1
Console.WriteLine("{0} = {1}: {2}", score,
scores(ctr2),
score.Equals(scores(ctr2),
new Item2Comparer(Of String, Double, Integer)))
Next
Console.WriteLine()
Next
End Sub
End Module
' The example displays the following output:
' (Ed, 78.8, 8) = (Abbey, 92.1, 9): False
' (Ed, 78.8, 8) = (Jim, 71.2, 9): False
' (Ed, 78.8, 8) = (Sam, 91.7, 8): False
' (Ed, 78.8, 8) = (Sandy, 71.2, 5): False
' (Ed, 78.8, 8) = (Penelope, 82.9, 8): False
' (Ed, 78.8, 8) = (Serena, 71.2, 9): False
' (Ed, 78.8, 8) = (Judith, 84.3, 9): False
'
' (Abbey, 92.1, 9) = (Jim, 71.2, 9): False
' (Abbey, 92.1, 9) = (Sam, 91.7, 8): False
' (Abbey, 92.1, 9) = (Sandy, 71.2, 5): False
' (Abbey, 92.1, 9) = (Penelope, 82.9, 8): False
' (Abbey, 92.1, 9) = (Serena, 71.2, 9): False
' (Abbey, 92.1, 9) = (Judith, 84.3, 9): False
'
' (Jim, 71.2, 9) = (Sam, 91.7, 8): False
' (Jim, 71.2, 9) = (Sandy, 71.2, 5): True
' (Jim, 71.2, 9) = (Penelope, 82.9, 8): False
' (Jim, 71.2, 9) = (Serena, 71.2, 9): True
' (Jim, 71.2, 9) = (Judith, 84.3, 9): False
'
' (Sam, 91.7, 8) = (Sandy, 71.2, 5): False
' (Sam, 91.7, 8) = (Penelope, 82.9, 8): False
' (Sam, 91.7, 8) = (Serena, 71.2, 9): False
' (Sam, 91.7, 8) = (Judith, 84.3, 9): False
'
' (Sandy, 71.2, 5) = (Penelope, 82.9, 8): False
' (Sandy, 71.2, 5) = (Serena, 71.2, 9): True
' (Sandy, 71.2, 5) = (Judith, 84.3, 9): False
'
' (Penelope, 82.9, 8) = (Serena, 71.2, 9): False
' (Penelope, 82.9, 8) = (Judith, 84.3, 9): False
'
' (Serena, 71.2, 9) = (Judith, 84.3, 9): False
Keterangan
Anggota ini adalah implementasi anggota antarmuka eksplisit. Ini hanya dapat digunakan ketika instans dilemparkan Tuple<T1,T2,T3> ke IStructuralEquatable antarmuka.
Implementasi IEqualityComparer.Equals dipanggil hanya jika other bukan null, dan jika dapat berhasil ditransmisikan (dalam C#) atau dikonversi (di Visual Basic) ke Tuple<T1,T2,T3> objek yang komponennya memiliki jenis yang sama dengan instans saat ini. Metode ini Tuple<T1,T2,T3>.IStructuralEquatable.Equals terlebih dahulu meneruskan Item1 nilai Tuple<T1,T2,T3> objek yang akan dibandingkan IEqualityComparer.Equals dengan implementasi. Jika panggilan metode ini mengembalikan true, metode dipanggil lagi dan melewati Item2 nilai dua Tuple<T1,T2,T3> objek. Jika panggilan metode ini kembali true , metode ini dipanggil untuk ketiga kalinya dan melewati Item3 nilai dua Tuple<T1,T2,T3> objek.
