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Tuple<T1>.IComparable.CompareTo Method

Compares the current Tuple<T1> object to a specified object, 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 IComparable.CompareTo(
	Object obj


Type: System.Object

An object to compare with the current instance.

Return Value

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



A negative integer

This instance precedes obj.


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

A positive integer

This instance follows obj.




obj is not a Tuple<T1> object.

This member is an explicit interface member implementation. It can be used only when the Tuple<T1> instance is cast to an IComparable interface.

This method provides the IComparable.CompareTo implementation for the Tuple<T1> class. Although the method can be called directly, it is most commonly called by the default overloads of collection sorting methods, such as Array.Sort(Array) and SortedList.Add, to order the members of a collection.

Caution noteCaution

The Tuple<T1>.IComparable.CompareTo 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 Equals method.

The Tuple<T1>.IComparable.CompareTo method uses the default object comparer.

The following example creates an array of singletons whose component is a Double value. It displays the value of each tuple component in unsorted order, sorts the array, and then displays the values in sorted order. Note that the example does not directly call the Tuple<T1>.IComparable.CompareTo method. This method is called implicitly by the Sort(Array) method for each element in the array.

using System;

class Example
   static void Main()
      Tuple<Double>[] values = { Tuple.Create(13.54),
                                 null };
      Console.WriteLine("The values in unsorted order:");
      foreach (var value in values)
         if (value != null)
            Console.WriteLine("   {0}", value.Item1);
            Console.WriteLine("   <null>");


      Console.WriteLine("The values in sorted order:");
      foreach (var value in values)
         if (value != null)
            Console.WriteLine("   {0}", value.Item1);
            Console.WriteLine("   <null>");
// The example displays the following output: 
//      The values in unsorted order: 
//         13.54 
//         NaN 
//         -189.42993 
//         Infinity 
//         4.94065645841247E-324 
//         1.934E-17 
//         -Infinity 
//         -3.588E-12 
//      The values in sorted order: 
//         NaN 
//         -Infinity 
//         -189.42993 
//         -3.588E-12 
//         4.94065645841247E-324 
//         1.934E-17 
//         13.54 
//         Infinity

.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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