Export (0) Print
Expand All

ArrayList.Contains Method

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.

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
Show:
© 2015 Microsoft