Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

CollectionView::IndexOf Method (Object^)

 

Returns the index at which the specified item is located.

Namespace:   System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)

public:
virtual int IndexOf(
	Object^ item
)

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
Available since 3.0
Return to top
Show:
© 2017 Microsoft