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CollectionBase.IList.Contains Method

Determines whether the CollectionBase contains a specific element.

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

private abstract Contains : 
        value:Object -> bool  
private override Contains : 
        value:Object -> bool

Parameters

value
Type: System.Object

The Object to locate in the CollectionBase.

Return Value

Type: System.Boolean
true if the CollectionBase contains the specified value; otherwise, false.

Implements

IList.Contains(Object)

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

This method determines equality by calling Object.Equals.

Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.

The following code example implements the CollectionBase class and uses that implementation to create a collection of Int16 objects.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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