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Collection(T).InsertItem Method

Inserts an element into the Collection(T) at the specified index.

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

abstract InsertItem : 
        index:int * 
        item:'T -> unit  
override InsertItem : 
        index:int * 
        item:'T -> unit

Parameters

index
Type: System.Int32

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

item
Type: T

The object to insert. The value can be a null reference (Nothing in Visual Basic) for reference types.

ExceptionCondition
ArgumentOutOfRangeException

index is less than zero.

-or-

index is greater than Count.

The InsertItem is meant to be overridden in a derived class. For a public method to insert an item in the Collection(T), see Insert.

Collection(T) accepts a null reference (Nothing in Visual Basic) as a valid value for reference types and allows duplicate elements.

If index is equal to Count, item is added to the end of Collection(T).

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

The following code example shows how to derive a collection class from a constructed type of the Collection(T) generic class, and how to override the protected InsertItem, RemoveItem, ClearItems, and SetItem methods to provide custom behavior for the Add, Insert, Remove, and Clear methods, and for setting the Item property.

The custom behavior provided by this example is a Changed notification event that is raised at the end of each of the protected methods. The Dinosaurs class inherits Collection<string> (Collection(Of String) in Visual Basic) and defines the Changed event, which uses a DinosaursChangedEventArgs class for the event information, and an enumeration to identify the kind of change.

The code example calls several properties and methods of Collection(T) to demonstrate the custom event.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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