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

Compares the current Tuple<T1, T2, T3, T4> object to a specified object by using a specified comparer and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

int IStructuralComparable.CompareTo(
	Object other,
	IComparer comparer
)

Parameters

other
Type: System.Object

An object to compare with the current instance.

comparer
Type: System.Collections.IComparer

An object that provides custom rules for comparison.

Return Value

Type: System.Int32
A signed integer that indicates the relative position of this instance and other in the sort order, as shown in the following table.

Value

Description

A negative integer

This instance precedes other.

Zero

This instance and other have the same position in the sort order.

A positive integer

This instance follows other.

Implements

IStructuralComparable.CompareTo(Object, IComparer)

ExceptionCondition
ArgumentException

other is not a Tuple<T1, T2, T3, T4> object.

This member is an explicit interface member implementation. It can be used only when the Tuple<T1, T2, T3, T4> instance is cast to an IStructuralComparable interface.

Although this method can be called directly, it is most commonly called by collection sorting methods that include IComparer parameters to order the members of a collection. For example, it is called by the Array.Sort(Array, IComparer) method and the Add method of a SortedList object that is instantiated by using the SortedList.SortedList(IComparer) constructor.

Caution noteCaution

The IStructuralComparable.CompareTo(Object, IComparer) method is intended for use in sorting operations. It should not be used when the primary purpose of a comparison is to determine whether two objects are equal. To determine whether two objects are equal, call the IStructuralEquatable.Equals(Object, IEqualityComparer) method.

The following example creates an array of Tuple<T1, T2, T3, T4> objects that contain statistical data about baseball pitchers. The data items include the name of the pitcher, the number of innings pitched, the pitcher's earned run average (the average number of runs a pitcher allows per game), and the number of hits the pitcher has given up. The example displays the component of each tuple in the array in unsorted order, sorts the array, and then calls ToString to display the value of each tuple in sorted order. To sort the array, the example defines a generic PitcherComparer class that implements the IComparer interface and sorts the Tuple<T1, T2, T3, T4> objects in ascending order by the value of their third component (the earned run average) rather than their first component. Note that the example does not directly call the IStructuralComparable.CompareTo(Object, IComparer) method. This method is called implicitly by the Array.Sort(Array, IComparer) method for each element in the array.

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)

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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