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ArrayList.AddRange Method

Adds the elements of an ICollection to the end of the ArrayList.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)
abstract AddRange : 
        c:ICollection -> unit  
override AddRange : 
        c:ICollection -> unit


Type: System.Collections.ICollection

The ICollection whose elements should be added to the end of the ArrayList. The collection itself cannot be a null reference (Nothing in Visual Basic), but it can contain elements that are a null reference (Nothing in Visual Basic).


c is a null reference (Nothing in Visual Basic).


The ArrayList is read-only.


The ArrayList has a fixed size.

ArrayList accepts a null reference (Nothing in Visual Basic) as a valid value and allows duplicate elements.

The order of the elements in the ICollection is preserved in the ArrayList.

If the new Count (the current Count plus the size of the collection) will be greater than Capacity, the capacity of the ArrayList is increased by automatically reallocating the internal array to accommodate the new elements, and the existing elements are copied to the new array before the new elements are added.

If the ArrayList can accommodate the new elements without increasing the Capacity, this method is an O(n) operation, where n is the number of elements to be added. If the capacity needs to be increased to accommodate the new elements, this method becomes an O(n + m) operation, where n is the number of elements to be added and m 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: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, 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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