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ArrayList.Add Method

Adds an object to the end of the ArrayList.

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

abstract Add : 
        value:Object -> int  
override Add : 
        value:Object -> int

Parameters

value
Type: System.Object

The Object to be added to the end of the ArrayList. The value can be a null reference (Nothing in Visual Basic).

Return Value

Type: System.Int32
The ArrayList index at which the value has been added.

Implements

IList.Add(Object)

ExceptionCondition
NotSupportedException

The ArrayList is read-only.

-or-

The ArrayList has a fixed size.

ArrayList accepts 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.

The following code example shows how to add elements to the ArrayList.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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