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ArrayList.Capacity Property

Gets or sets the number of elements that the ArrayList can contain.

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

abstract Capacity : int with get, set 
override Capacity : int with get, set

Property Value

Type: System.Int32
The number of elements that the ArrayList can contain.

ExceptionCondition
ArgumentOutOfRangeException

Capacity is set to a value that is less than Count.

OutOfMemoryException

There is not enough memory available on the system.

Capacity is the number of elements that the ArrayList can store. Count is the number of elements that are actually in the ArrayList.

Capacity is always greater than or equal to Count. If Count exceeds Capacity while adding elements, the capacity is automatically increased by reallocating the internal array before copying the old elements and adding the new elements.

The capacity can be decreased by calling TrimToSize or by setting the Capacity property explicitly. When the value of Capacity is set explicitly, the internal array is also reallocated to accommodate the specified capacity.

Retrieving the value of this property is an O(1) operation; setting the property is an O(n) operation, where n is the new capacity.

.NET Framework

Supported in: 4.5.2, 4.5.1, 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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