IList.IndexOf Method

List(Of T).IList.IndexOf Method

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

Determines the index of a specific item in the IList.

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

'Declaration
Private Function IndexOf ( _
	item As Object _
) As Integer Implements IList.IndexOf

Parameters

item
Type: System.Object
The object to locate in the IList.

Return Value

Type: System.Int32
The index of item if found in the list; otherwise, –1.

Implements

IList.IndexOf(Object)

ExceptionCondition
ArgumentException

item is of a type that is not assignable to the IList.

This method determines equality using the default equality comparer EqualityComparer(Of T).Default for T, the type of values in the list.

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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