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[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
Determines whether an element is in the ArrayList.
Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
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
public function Contains(
item : Object
) : boolean
Parameters
- item
Type: System. . :: . .Object
The Object to locate in the ArrayList. The value can be nullNothingnullptrunita null reference (Nothing in Visual Basic).
Return Value
Type: System. . :: . .Boolean
true if item is found in the ArrayList; otherwise, false.
Implements
IList. . :: . .Contains(Object)
Remarks
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.
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see dd66cd4c-b087-415f-9c3e-94e3a1835f74.