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CollectionView.IndexOf Method

Returns the index at which the specified item is located.

Namespace:  System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)
abstract IndexOf : 
        item:Object -> int  
override IndexOf : 
        item:Object -> int

Parameters

item
Type: System.Object

The item to locate.

Return Value

Type: System.Int32
The index at which the specified item is located, or –1 if the item is unknown.

If this method returns an index other than -1, it must always be true that view[index-1] < item <= view[index], where the comparisons are done using the IComparer.Compare method of the view, if one exists.

This particular behavior of the method is used by some CollectionChanged event handlers to speed up reaction to insertion and deletion. If the derived class does not override this method, a listener does a binary search using the IComparer.Compare method.

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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