Question

I’ve recently used LINQ

In the following code:

ArrayList list = new ArrayList();
var myStrings = list.AsQueryable().Cast<string>();

What is the AsQueryable for? I know Cast creates a type-safe collection, and ArrayList is deprecated.

I’ve got a friend who says he needs the AsQueryable combined with ArrayList. I’m trying to understand why, but I can’t see why AsQueryable is needed.

Is he wrong?

Answer 1

AsQueryable would be used to produce an IQueryable which can then, if implemented, analyse the query via expression trees to rewrite it or translate it into some other language-like with linq to sql for example.

In this case it is completely pointless and you can tell your friend not to bother.