Question

Well,

the question is kinda simple.

I have a object defined as:

public class FullListObject : System.Collections.ArrayList, IPagedCollection

And when i try to:

IPagedCollection pagedCollection = (IPagedCollection)value;

It don’t work… value is a FullListObject… this is my new code trying to get around a issue with the “is” operator. When the system tests (value is IPagedCollection) it never gets true for FullListObject.

How to cast the object to another object with a interface type?

EDIT:

Just for the record: the bugger code

if (value is IPagedCollection)
{
    IPagedCollection pagedCollection = value as IPagedCollection;

The if was never hitting true, and forcing the conversion wasn’t working too. So the issue was the double definition of classes. Now i defined the FullObjectList in a “Commom” project for classes used by the whole system. Problem gone!

Answer 1

You’re doing it right. Try this (it will fail also but show the problem):

IPagedCollection pagedCollection = (FullListObject)value;

The compiler should accept this just fine. If not, you have multiple definitions of either IPagedCollection and/or FullListObject which conflict each other. If that fails at runtime, your value is not a FullListObject.