Share via

Insert Method

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

Inserts an element into the ArrayList at the specified index.

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

Syntax

'Declaration
Public Overridable Sub Insert ( _
    index As Integer, _
    value As Object _
)

public virtual void Insert(
    int index,
    Object value
)

public:
virtual void Insert(
    int index, 
    Object^ value
)

abstract Insert : 
        index:int * 
        value:Object -> unit 
override Insert : 
        index:int * 
        value:Object -> unit 

public function Insert(
    index : int, 
    value : Object
)

Parameters

  • value
    Type: System. . :: . .Object
    The Object to insert. The value can be nullNothingnullptrunita null reference (Nothing in Visual Basic).

Implements

IList. . :: . .Insert(Int32, Object)

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 index is equal to Count, value is added to the end of ArrayList.

In collections of contiguous elements, such as lists, the elements that follow the insertion point move down to accommodate the new element. If the collection is indexed, the indexes of the elements that are moved are also updated. This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.

This method is an O(n) operation, where n is Count.

.NET Framework Security

See Also

Reference

ArrayList Class

System.Collections Namespace