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Tuple(T1, T2, T3, T4, T5, T6, T7).IComparable.CompareTo Method

Compares the current Tuple(T1, T2, T3, T4, T5, T6, T7) 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)

private abstract CompareTo : 
        obj:Object -> int  
private override CompareTo : 
        obj:Object -> int


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.



This member is an explicit interface member implementation. It can be used only when the Tuple(T1, T2, T3, T4, T5, T6, T7) instance is cast to an IComparable interface.

This method provides the IComparable.CompareTo implementation for the Tuple(T1, T2, T3, T4, T5, T6, T7) 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 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 Tuple(T1, T2, T3, T4, T5, T6, T7).Equals(Object) method.

This method uses the default object comparer to compare each component.

The following example creates an array of Tuple(T1, T2, T3, T4, T5, T6, T7) objects that contain population data for three cities in the United States from 1950 to 2000. The seven components consist of the city name followed by the city's population at 10-year intervals from 1950 to 2000. The example displays the components of each tuple in the array in unsorted order, sorts the array, and then calls the ToString method to display each tuple in sorted order. The output shows that the array has been sorted by name, which is the first component. Note that the example does not directly call the IComparable.CompareTo(Object) method. This method is called implicitly by the Sort(Array) method for each element in the array.

No code example is currently available or this language may not be supported.

.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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