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[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
Adds an object to the end of the ArrayList.
Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Overridable Function Add ( _
value As Object _
) As Integer
public virtual int Add(
Object value
)
public:
virtual int Add(
Object^ value
)
abstract Add :
value:Object -> int
override Add :
value:Object -> int
public function Add(
value : Object
) : int
Parameters
- value
Type: System. . :: . .Object
The Object to be added to the end of the ArrayList. The value can be nullNothingnullptrunita null reference (Nothing in Visual Basic).
Return Value
Type: System. . :: . .Int32
The ArrayList index at which the value has been added.
Implements
Remarks
ArrayList accepts null Nothing nullptr unit a null reference (Nothing in Visual Basic) as a valid value and allows duplicate elements.
If Count already equals Capacity, the capacity of the ArrayList is increased by automatically reallocating the internal array, and the existing elements are copied to the new array before the new element is added.
If Count is less than Capacity, this method is an O(1) operation. If the capacity needs to be increased to accommodate the new element, this method becomes an O(n) operation, where n is Count.
.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.