Insert Method

ArrayList.Insert Method (Int32, Object)

 

Inserts an element into the ArrayList at the specified index.

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

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

Parameters

index
Type: System.Int32

The zero-based index at which value should be inserted.

value
Type: System.Object

The Object to insert. The value can be null.

Exception Condition
ArgumentOutOfRangeException

index is less than zero.

-or-

index is greater than Count.

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 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.

The following code example shows how to insert elements into 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
Return to top
Show:
© 2016 Microsoft