ArrayList.Add Method (Object)

 

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 null.

Return Value

Type: System.Int32

The ArrayList index at which the value has been added.

Exception Condition
NotSupportedException

The ArrayList is read-only.

-or-

The ArrayList has a fixed size.

ArrayList accepts null 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.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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