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IList<T>.IndexOf Method

Determines the index of a specific item in the IList<T>.

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

int IndexOf(
	T item
)

Parameters

item
Type: T

The object to locate in the IList<T>.

Return Value

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

If an object occurs multiple times in the list, the IndexOf method always returns the first instance found.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

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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