IndexOf Method

ReadOnlyCollection(Of T).IndexOf Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Searches for the specified object and returns the zero-based index of the first occurrence within the entire ReadOnlyCollection(Of T).

Namespace:  System.Collections.ObjectModel
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Function IndexOf ( _
	value As T _
) As Integer

Parameters

value
Type: T
The object to locate in the List(Of T). The value can be Nothing for reference types.

Return Value

Type: System.Int32
The zero-based index of the first occurrence of item within the entire ReadOnlyCollection(Of T), if found; otherwise, -1.

Implements

IList(Of T).IndexOf(T)

The ReadOnlyCollection(Of T) is searched forward starting at the first element and ending at the last element.

This method determines equality using the default comparer EqualityComparer(Of T).Default.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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