Tuple<T1,T2,T3>.IStructuralComparable.CompareTo 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
透過指定的比較器將當前 Tuple<T1,T2,T3> 物件與指定物件比較,並回傳一個整數,表示目前物件在排序順序中是位於指定物件之前、之後或相同位置。
virtual int System.Collections.IStructuralComparable.CompareTo(System::Object ^ other, System::Collections::IComparer ^ comparer) = System::Collections::IStructuralComparable::CompareTo;
int IStructuralComparable.CompareTo(object other, System.Collections.IComparer comparer);
abstract member System.Collections.IStructuralComparable.CompareTo : obj * System.Collections.IComparer -> int
override this.System.Collections.IStructuralComparable.CompareTo : obj * System.Collections.IComparer -> int
Function CompareTo (other As Object, comparer As IComparer) As Integer Implements IStructuralComparable.CompareTo
參數
- other
- Object
一個可以與當前實例比較的物件。
- comparer
- IComparer
一個提供自訂比較規則的物件。
傳回
一個帶符號整數,表示此實例的相對位置及其 other 排序順序,如下表所示。
| 價值 | 描述 |
|---|---|
| 一個負整數 | 此實例發生 other於 之前。
|
| 零 | 這個實例和 other 在排序順序中的位置相同。
|
| 一個正整數 | 此實例可得 other。
|
實作
例外狀況
other 不是 Tuple<T1,T2,T3> 物件。
範例
以下範例建立一個由學生姓名、平均測驗分數及測驗數量組成的物件陣列 Tuple<T1,T2,T3> 。 它會以未排序順序顯示陣列中每個元組的組件,然後對陣列進行排序,然後呼叫 ToString 以排序順序顯示每個元組的值。 為了排序陣列,範例定義了一個通用 ScoreComparer 類別,該類別實 IComparer 作介面,並依 Tuple<T1,T2,T3> 物件的第二個組件值而非第一個組件的值,依序排序。 請注意,範例中並未直接呼叫該 Tuple<T1,T2,T3>.IStructuralComparable.CompareTo 方法。 此方法由 方法 Array.Sort(Array, IComparer) 隱含呼叫,針對陣列中的每個元素。
using System;
using System.Collections;
using System.Collections.Generic;
public class ScoreComparer<T1, T2, T3> : IComparer
{
public int Compare(object x, object y)
{
Tuple<T1, T2, T3> tX = x as Tuple<T1,T2, T3>;
if (tX == null)
{
return 0;
}
else
{
Tuple<T1, T2, T3> tY = y as Tuple<T1, T2, T3>;
return Comparer<T2>.Default.Compare(tX.Item2, tY.Item2);
}
}
}
public class Example
{
public static void Main()
{
Tuple<string, double, int>[] scores =
{ Tuple.Create("Jack", 78.8, 8),
Tuple.Create("Abbey", 92.1, 9),
Tuple.Create("Dave", 88.3, 9),
Tuple.Create("Sam", 91.7, 8),
Tuple.Create("Ed", 71.2, 5),
Tuple.Create("Penelope", 82.9, 8),
Tuple.Create("Linda", 99.0, 9),
Tuple.Create("Judith", 84.3, 9) };
Console.WriteLine("The values in unsorted order:");
foreach (var score in scores)
Console.WriteLine(score.ToString());
Console.WriteLine();
Array.Sort(scores, new ScoreComparer<string, double, int>());
Console.WriteLine("The values in sorted order:");
foreach (var score in scores)
Console.WriteLine(score.ToString());
}
}
// The example displays the following output;
// The values in unsorted order:
// (Jack, 78.8, 8)
// (Abbey, 92.1, 9)
// (Dave, 88.3, 9)
// (Sam, 91.7, 8)
// (Ed, 71.2, 5)
// (Penelope, 82.9, 8)
// (Linda, 99, 9)
// (Judith, 84.3, 9)
//
// The values in sorted order:
// (Ed, 71.2, 5)
// (Jack, 78.8, 8)
// (Penelope, 82.9, 8)
// (Judith, 84.3, 9)
// (Dave, 88.3, 9)
// (Sam, 91.7, 8)
// (Abbey, 92.1, 9)
// (Linda, 99, 9)
open System
open System.Collections
open System.Collections.Generic
type ScoreComparer<'T1, 'T2, 'T3>() =
interface IComparer with
member _.Compare(x: obj, y: obj) =
match x with
| :? Tuple<'T1, 'T2, 'T3> as tX ->
let tY = y :?> Tuple<'T1, 'T2, 'T3>
Comparer<'T2>.Default.Compare(tX.Item2, tY.Item2)
| _ -> 0
let scores =
[| Tuple.Create("Jack", 78.8, 8)
Tuple.Create("Abbey", 92.1, 9)
Tuple.Create("Dave", 88.3, 9)
Tuple.Create("Sam", 91.7, 8)
Tuple.Create("Ed", 71.2, 5)
Tuple.Create("Penelope", 82.9, 8)
Tuple.Create("Linda", 99.0, 9)
Tuple.Create("Judith", 84.3, 9) |]
printfn "The values in unsorted order:"
for score in scores do
printfn $"{score}"
printfn ""
Array.Sort(scores, ScoreComparer<string, double, int>())
printfn "The values in sorted order:"
for score in scores do
printfn $"{score}"
// The example displays the following output
// The values in unsorted order:
// (Jack, 78.8, 8)
// (Abbey, 92.1, 9)
// (Dave, 88.3, 9)
// (Sam, 91.7, 8)
// (Ed, 71.2, 5)
// (Penelope, 82.9, 8)
// (Linda, 99, 9)
// (Judith, 84.3, 9)
//
// The values in sorted order:
// (Ed, 71.2, 5)
// (Jack, 78.8, 8)
// (Penelope, 82.9, 8)
// (Judith, 84.3, 9)
// (Dave, 88.3, 9)
// (Sam, 91.7, 8)
// (Abbey, 92.1, 9)
// (Linda, 99, 9)
Imports System.Collections
Imports System.Collections.Generic
Public Class ScoreComparer(Of T1, T2, T3) : Implements IComparer
Public Function Compare(x As Object, y As Object) As Integer _
Implements IComparer.Compare
Dim tX As Tuple(Of T1, T2, T3) = TryCast(x, Tuple(Of T1, T2, T3))
If tX Is Nothing Then
Return 0
Else
Dim tY As Tuple(Of T1, T2, T3) = DirectCast(y, Tuple(Of T1, T2, T3))
Return Comparer(Of T2).Default.Compare(tx.Item2, tY.Item2)
End If
End Function
End Class
Module Example
Public Sub Main()
Dim scores() =
{ Tuple.Create("Jack", 78.8, 8),
Tuple.Create("Abbey", 92.1, 9),
Tuple.Create("Dave", 88.3, 9),
Tuple.Create("Sam", 91.7, 8),
Tuple.Create("Ed", 71.2, 5),
Tuple.Create("Penelope", 82.9, 8),
Tuple.Create("Linda", 99.0, 9),
Tuple.Create("Judith", 84.3, 9) }
Console.WriteLine("The values in unsorted order:")
For Each score In scores
Console.WriteLine(score.ToString())
Next
Console.WriteLine()
Array.Sort(scores, New ScoreComparer(Of String, Double, Integer)())
Console.WriteLine("The values in sorted order:")
For Each score In scores
Console.WriteLine(score.ToString())
Next
End Sub
End Module
' The example displays the following output;
' The values in unsorted order:
' (Jack, 78.8, 8)
' (Abbey, 92.1, 9)
' (Dave, 88.3, 9)
' (Sam, 91.7, 8)
' (Ed, 71.2, 5)
' (Penelope, 82.9, 8)
' (Linda, 99, 9)
' (Judith, 84.3, 9)
'
' The values in sorted order:
' (Ed, 71.2, 5)
' (Jack, 78.8, 8)
' (Penelope, 82.9, 8)
' (Judith, 84.3, 9)
' (Dave, 88.3, 9)
' (Sam, 91.7, 8)
' (Abbey, 92.1, 9)
' (Linda, 99, 9)
備註
此成員為明確介面成員實作。 它只能在實 Tuple<T1,T2,T3> 例投射到 IStructuralComparable 介面時使用。
雖然此方法可直接呼叫,但最常見的是集合排序方法,包含 IComparer 參數來排序集合成員。 例如,它由Array.Sort(Array, IComparer)使用Add建構子實例化的物件的方法和SortedList方法SortedList.SortedList(IComparer)所呼叫。
注意事項
此 Tuple<T1,T2,T3>.IStructuralComparable.CompareTo 方法主要用於排序操作。 當比較的主要目的是判斷兩個物體是否相等時,不應使用此方法。 要判斷兩個物體是否相等,請呼叫該 Tuple<T1,T2,T3>.IStructuralEquatable.Equals 方法。