共用方式為


Tuple<T1,T2,T3,T4>.IStructuralComparable.CompareTo 方法

定義

使用指定的比較子將目前的 Tuple<T1,T2,T3,T4> 物件和指定的物件進行比較,並且傳回一個整數,表示目前的物件在排序順序中位於指定之物件的前面、後面還是相的位置。

 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

要與目前執行個體比較的物件。

comparer
IComparer

提供自訂規則進行比較的物件。

傳回

帶正負號的整數,可指出此執行個體以及排序次序中 other 的相對位置,如下表所示。

描述
負整數 這個執行個體位於 other 之前。
這個執行個體和 other 的排序位置相同。
正整數 這個執行個體位於 other 之後。

實作

例外狀況

other 不是 Tuple<T1,T2,T3,T4> 物件。

範例

下列範例會建立物件的陣列 Tuple<T1,T2,T3,T4> ,其中包含有關足球手的統計資料。 資料項目包括玩家名稱、推入的旅館數目、玩家所獲得的平均執行平均 (玩家允許每個遊戲的平均回合數) ,以及玩家已放棄的點擊次數。 此範例會以未排序的順序顯示陣列中每個 Tuple 的元件、排序陣列,然後呼叫 ToString 以依排序次序顯示每個 Tuple 的值。 為了排序陣列,此範例會定義泛型 PitcherComparer 類別,該類別會實 IComparer 作 介面,並以第三個元件的值遞增順序排序 Tuple<T1,T2,T3,T4> 物件, (所獲得的執行平均) 而不是第一個元件。 請注意,此範例不會直接呼叫 IStructuralComparable.CompareTo(Object, IComparer) 方法。 這個方法是由 Array.Sort(Array, IComparer) 陣列中每個元素的 方法隱含呼叫。

using System;
using System.Collections;
using System.Collections.Generic;

public class PitcherComparer<T1, T2, T3, T4> : IComparer
{
   public int Compare(object x, object y)
   {
      Tuple<T1, T2, T3, T4> tX = x as Tuple<T1, T2, T3, T4>;
      if (tX == null)
      { 
         return 0;
      }   
      else
      {
         Tuple<T1, T2, T3, T4> tY = y as Tuple<T1, T2, T3, T4>;
         return Comparer<T3>.Default.Compare(tX.Item3, tY.Item3);             
      }
   }
}

public class Example
{
   public static void Main()
   {
      Tuple<string, double, double, int>[] pitchers = 
                    { Tuple.Create("McHale, Joe", 240.1, 3.60, 221),
                      Tuple.Create("Paul, Dave", 233.1, 3.24, 231), 
                      Tuple.Create("Williams, Mike", 193.2, 4.00, 183),
                      Tuple.Create("Blair, Jack", 168.1, 3.48, 146), 
                      Tuple.Create("Henry, Walt", 140.1, 1.92, 96),
                      Tuple.Create("Lee, Adam", 137.2, 2.94, 109),
                      Tuple.Create("Rohr, Don", 101.0, 3.74, 110) };

      Console.WriteLine("The values in unsorted order:");
      foreach (var pitcher in pitchers)
         Console.WriteLine(pitcher.ToString());

      Console.WriteLine();

      Array.Sort(pitchers, new PitcherComparer<string, double, double, int>());

      Console.WriteLine("The values sorted by earned run average (component 3):");
      foreach (var pitcher in pitchers)
         Console.WriteLine(pitcher.ToString());
   }
}
// The example displays the following output;
//       The values in unsorted order:
//       (McHale, Joe, 240.1, 3.6, 221)
//       (Paul, Dave, 233.1, 3.24, 231)
//       (Williams, Mike, 193.2, 4, 183)
//       (Blair, Jack, 168.1, 3.48, 146)
//       (Henry, Walt, 140.1, 1.92, 96)
//       (Lee, Adam, 137.2, 2.94, 109)
//       (Rohr, Don, 101, 3.74, 110)
//       
//       The values sorted by earned run average (component 3):
//       (Henry, Walt, 140.1, 1.92, 96)
//       (Lee, Adam, 137.2, 2.94, 109)
//       (Rohr, Don, 101, 3.74, 110)
//       (Blair, Jack, 168.1, 3.48, 146)
//       (McHale, Joe, 240.1, 3.6, 221)
//       (Paul, Dave, 233.1, 3.24, 231)
//       (Williams, Mike, 193.2, 4, 183)
open System
open System.Collections
open System.Collections.Generic

type PitcherComparer<'T1, 'T2, 'T3, 'T4>() =
    interface IComparer with
        member _.Compare(x: obj, y: obj) =
            match x with
            | :? Tuple<'T1, 'T2, 'T3, 'T4> as tX ->
                let tY = y :?> Tuple<'T1, 'T2, 'T3, 'T4>
                Comparer<'T3>.Default.Compare(tX.Item3, tY.Item3)             
            | _ -> 0

let pitchers = 
    [| Tuple.Create("McHale, Joe", 240.1, 3.60, 221)
       Tuple.Create("Paul, Dave", 233.1, 3.24, 231)
       Tuple.Create("Williams, Mike", 193.2, 4.00, 183)
       Tuple.Create("Blair, Jack", 168.1, 3.48, 146)
       Tuple.Create("Henry, Walt", 140.1, 1.92, 96)
       Tuple.Create("Lee, Adam", 137.2, 2.94, 109)
       Tuple.Create("Rohr, Don", 101.0, 3.74, 110) |]

printfn "The values in unsorted order:"
for pitcher in pitchers do
    printfn $"{pitcher}"

printfn ""

Array.Sort(pitchers, PitcherComparer<string, double, double, int>())

printfn "The values sorted by earned run average (component 3):"
for pitcher in pitchers do
    printfn $"{pitcher}"
// The example displays the following output
//       The values in unsorted order:
//       (McHale, Joe, 240.1, 3.6, 221)
//       (Paul, Dave, 233.1, 3.24, 231)
//       (Williams, Mike, 193.2, 4, 183)
//       (Blair, Jack, 168.1, 3.48, 146)
//       (Henry, Walt, 140.1, 1.92, 96)
//       (Lee, Adam, 137.2, 2.94, 109)
//       (Rohr, Don, 101, 3.74, 110)
//       
//       The values sorted by earned run average (component 3):
//       (Henry, Walt, 140.1, 1.92, 96)
//       (Lee, Adam, 137.2, 2.94, 109)
//       (Rohr, Don, 101, 3.74, 110)
//       (Blair, Jack, 168.1, 3.48, 146)
//       (McHale, Joe, 240.1, 3.6, 221)
//       (Paul, Dave, 233.1, 3.24, 231)
//       (Williams, Mike, 193.2, 4, 183)
Imports System.Collections
Imports System.Collections.Generic

Public Class PitcherComparer(Of T1, T2, T3, T4) : 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 T3).Default.Compare(tx.Item3, tY.Item3)             
      End If
   End Function
End Class

Module Example
   Public Sub Main()
      Dim pitchers() = 
                { Tuple.Create("McHale, Joe", 240.1, 3.60, 221),
                  Tuple.Create("Paul, Dave", 233.1, 3.24, 231), 
                  Tuple.Create("Williams, Mike", 193.2, 4.00, 183),
                  Tuple.Create("Blair, Jack", 168.1, 3.48, 146), 
                  Tuple.Create("Henry, Walt", 140.1, 1.92, 96),
                  Tuple.Create("Lee, Adam", 137.2, 2.94, 109),
                  Tuple.Create("Rohr, Don", 101.0, 3.74, 110) }

      Console.WriteLine("The values in unsorted order:")
      For Each pitcher In pitchers
         Console.WriteLine(pitcher.ToString())
      Next
      Console.WriteLine()

      Array.Sort(pitchers, New PitcherComparer(Of String, Double, Double, Integer)())

      Console.WriteLine("The values sorted by earned run average (component 3):")
      For Each pitcher In pitchers
         Console.WriteLine(pitcher.ToString())
      Next
   End Sub
End Module
' The example displays the following output;
'       The values in unsorted order:
'       (McHale, Joe, 240.1, 3.6, 221)
'       (Paul, Dave, 233.1, 3.24, 231)
'       (Williams, Mike, 193.2, 4, 183)
'       (Blair, Jack, 168.1, 3.48, 146)
'       (Henry, Walt, 140.1, 1.92, 96)
'       (Lee, Adam, 137.2, 2.94, 109)
'       (Rohr, Don, 101, 3.74, 110)
'       
'       The values sorted by earned run average (component 3):
'       (Henry, Walt, 140.1, 1.92, 96)
'       (Lee, Adam, 137.2, 2.94, 109)
'       (Rohr, Don, 101, 3.74, 110)
'       (Blair, Jack, 168.1, 3.48, 146)
'       (McHale, Joe, 240.1, 3.6, 221)
'       (Paul, Dave, 233.1, 3.24, 231)
'       (Williams, Mike, 193.2, 4, 183)

備註

這個成員是明確介面成員實作, 只有在 Tuple<T1,T2,T3,T4> 執行個體轉換成 IStructuralComparable 介面時,才能使用這個成員。

雖然可以直接呼叫這個方法,但最常由集合排序方法呼叫,其中包含 IComparer 排序集合成員的參數。 例如,它會由 Array.Sort(Array, IComparer) 方法呼叫,以及 Add 使用 SortedList.SortedList(IComparer) 建構函式具現化之 SortedList 物件的 方法。

警告

方法 IStructuralComparable.CompareTo(Object, IComparer) 適用于排序作業。 當比較的主要用途是判斷兩個物件是否相等時,不應該使用它。 若要判斷兩個物件是否相等,請呼叫 IStructuralEquatable.Equals(Object, IEqualityComparer) 方法。

適用於