List.System.Collections.IList.IndexOf Method

Determines the index of a specific item in the IList.

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

int IList.IndexOf (
	Object item
)
Not applicable.

Parameters

item

The object to locate in the IList.

Return Value

The index of item if found in the list; otherwise, –1.

Exception typeCondition

ArgumentException

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

This method determines equality using the default equality comparer EqualityComparer.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 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

.NET Compact Framework

Supported in: 2.0

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