Contains Method

ArrayList.Contains Method (Object)

 

Determines whether an element is in the ArrayList.

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

public virtual bool Contains(
	object item
)

Parameters

item
Type: System.Object

The Object to locate in the ArrayList. The value can be null.

Return Value

Type: System.Boolean

true if item is found in the ArrayList; otherwise, false.

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.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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