Getting RowCount For IQueryable not IQueryable

Long story short, we have a C# WebApi that provides mapped instances from our DAL into DTOS.

Each controller exposes a IEnumerable Get()

I have a test that finds all the controllers, and call this get method.

This flushes out any mapping errors that only occur on execution.

A while I noticed that to be sure you had to actually execute the enumeration otherwise the the mapping never takes place.

So i have this code

        if (results is IEnumerable enumerable)
        {
            var counter = enumerable.Cast<object>().Count();
            Trace.Write($"{counter} results found.");
        }

This executes the cast (which invokes the mapping) and gives me a count for output reasons.

This worked until the result set got massive - it nows just times out.

Most of my IEnumerables are actually IQueryable underneath

I need a way to 'Take(10)' on an IQueryable that can work on reflected data/executed types. This will let the mapping work but on a smaller data set.

Help!