Question

Can you use LINQ in an object that exposes only Add(), Remove(), Count(), Item() and GetEnumerator() from System.Collections.IEnumerator?

Answer 1

The existing Linq extension methods work on objects that implement IEnumerable<T>. I assume your object implements the non-generic IEnumerable interface. In that case you can use the Cast<T> extension method to get a generic IEnumerable<T> wrapper. For instance, if the elements are of type int :

var wrapper = myObject.Cast<int>();

You can now use Linq on the wrapper