type-safe collection

[Gary]

Newbie: I would like to make a strongly typed, sortable collection by
leveraging a
Framework class. I began by looking at CollectionBase but it doesn't have
built-in sorting. I would prefer to derive from ArrayList, but if I code
an Add(MyElement) method, the original Add(object) remains exposed,
compromising type safety. I know this must be a common task, how to do it?
Thanks,
Gary

 

[Jeff Louie]

Gary... You could write a base class that contains an array list by
ownership and then extend from this base class.

http://www.geocities.com/jeff_louie/OOP/oop7.htm

Regards,
Jeff

I would prefer to derive from ArrayList, but if I code

an Add(MyElement) method, the original Add(object) remains exposed,
compromising type safety.<

 

[David Browne]

Newbie: I would like to make a strongly typed, sortable collection by
leveraging a
Framework class. I began by looking at CollectionBase but it doesn't have
built-in sorting. I would prefer to derive from ArrayList, but if I code
an Add(MyElement) method, the original Add(object) remains exposed,
compromising type safety. I know this must be a common task, how to do

it?

Override Add(Object) and check the type of the input object, and throw an
exception if it is the wrong type. Not a perfect solution, since it is a
run-time error, but strongly-typed collections won't be right until
generics, anyway.

David