CODEWITHSUNDEEP
c#
Sali
Sali

Reputation: 87

Does List<string> have a Changed event in c#?

I have recently bought a book called "The c# programming language" 4th edition. On page 49 there is a reference to a List having a changed event that can be bound to as an example of events. Have tried to reproduce this but ended up doing some head scratching with this :-

List<string> names = new List<string>();
names.Changed+= new EventHandler(ListChanged);

and so it continues.... Am I missing something or does List not have a changed event?

Upvotes: 4

Views: 543

Answers (5)

Gabe
Gabe

Reputation: 86728

Indeed, it does. However, the List<T> with a Changed event referenced on page 49 is actually introduced on page 40. It is not the List<T> that is part of the base class library. To use the version included in the book you will have to type it in yourself (or maybe the book comes with a CD, or perhaps you can download it), and your code will not be compatible any other code that uses the System.Collections.Generic.List<T> that everybody else uses.

Upvotes: 1

Glory Raj
Glory Raj

Reputation: 17701

You can use ObservableCollection and you can add the namespace for using those 

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

Upvotes: 0

Dennis Traub
Dennis Traub

Reputation: 51644

There is no such event on List<T>. Maybe the book is refering to System.Collections.ObjectModel.ObservableCollection<T>?

Upvotes: 0

Jens
Jens

Reputation: 25563

Nope, take a look at ObservableCollection.

Upvotes: 5

Darin Dimitrov
Darin Dimitrov

Reputation: 1038940

No, List<T> doesn't have such event, you are not missing anything. You may checkout the ObservableCollection<T> which has a CollectionChanged event you could subscribe to. It is extensively used in WPF and Silverlight to implement the MVVM pattern.

Upvotes: 6

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