Collection<T>::InsertItem Method
Inserts an element into the Collection<T> at the specified index.
Namespace: System.Collections.ObjectModel
Assembly: mscorlib (in mscorlib.dll)
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 nullptr for reference types.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | index is less than zero. -or- index is greater than Count. |
Collection<T> accepts nullptr 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.
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