Question

Possible Duplicate:
IEnumerable.Cast<>

One can implicitly convert from int to double.
Why does “Specified cast is not valid.” exception is raised here?

 double[] a = Enumerable.Range(0, 7).Cast<double>().ToArray();

I have tried several “versions” of it.

P.S. I know possible solutions like:

 double[] a = Enumerable.Range(0, 7).Select(x => (double)x).ToArray();

But I’m curious how Cast works => why it doesn’t work in this example which looks so obvious.

Answer 1

Cast is made to turn an IEnumerable (untyped) to an IEnumerable<T> (generically typed). It won’t actually differently-cast any of the members.

Per this answer:

Well, you have incorrect expectations of Cast, that’s all – it’s meant
to deal with boxing/unboxing, reference and identity conversions, and
that’s all. It’s unfortunate that the documentation isn’t as clear as
it might be

So, you’re stuck with .Select().