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IndexOf Method
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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: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
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