Can I exclude part of a method from code coverage?

I suspect the answer is no, but I'll ask anyway...

TL;DR

I know I can exclude a class or method from coverage analysis with the [ExcludeFromCodeCoverage] attribute, but is there a way to exclude only part of a method?

Concrete example

I have a method that lazily generates a sequence of int.MaxValue elements:

private static IEnumerable<TElement> GenerateIterator<TElement>(Func<int, TElement> generator)
{
    for (int i = 0; i < int.MaxValue; i++)
    {
        yield return generator(i);
    }
}

In practice, it's never fully enumerated, so the end of the method is never reached. Because of that, DotCover considers that 20% of the method is not covered, and it highlights the closing brace as uncovered (which corresponds to return false in the generated MoveNext method).

I could write a test that consumes the whole sequence, but it takes a very long time to run, especially with coverage enabled.

So I'd like to find a way to tell DotCover that the very last instruction doesn't need to be covered.

Note: I know I don't really need to have all the code covered by unit tests; some pieces of code can't or don't need to be tested, and I usually exclude those with the [ExcludeFromCodeCoverage] attribute. But I like to have 100% reported coverage for the code that I do test, because it makes it easier to spot untested parts of the code. Having a method with 80% coverage when you know there is nothing more to test in it is quite annoying...

Solution

No, there is no way to exclude "part of a method" from coverage analysis with dotCover.

In the general sense you got a couple of options:

Extract the uncovered part into its own method, so you can properly ignore that method from analsysis
Ignore the problem

In this case there may be a third options. Since your test code exercises the majority of your method, perhaps you should just write a test method that makes sure the code runs to completion?