ArrayList.Contains Method (System.Collections)

Public Overridable Function Contains ( _
	item As Object _
) As Boolean

public virtual bool Contains(
	Object item
)

public:
virtual bool Contains(
	Object^ item
)

abstract Contains : 
        item:Object -> bool 
override Contains : 
        item:Object -> bool 

Implements

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.

.NET Framework

.NET Framework Client Profile

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

Other Resources