IList.Contains Method

Collection<T>.IList.Contains Method

Determines whether the IList contains a specific value.

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

bool IList.Contains(
	Object value


Type: System.Object

The Object to locate in the IList.

Return Value

Type: System.Boolean
true if the Object is found in the IList; otherwise, false.




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

This method determines equality by first determining whether value is of type T (or null) and then calling Contains.

This method is an O(n) operation, where n is Count.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Community Additions

© 2015 Microsoft