IndexOfKey Method (ReadOnlyKeyedObservableCollection<TItem,TKey>)

Returns the index of the item with the specified key or null if none exists.

Syntax

Visual Basic

'Declaration
 
Public Function IndexOfKey( _
   ByVal key As TKey _
) As Integer

C#

public int IndexOfKey( 
   TKey key
)

Parameters

key

The key to locate

Return Value

The index of the item with the key or -1 if no item with the specified key exists

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2