Casting IEnumerable<int> to IEnumerable<long> fails [duplicate]

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Possible Duplicate:

Puzzling Enumerable.Cast InvalidCastException

Why does

List<long> numbers = Enumerable.Range(1, 9999).Cast<long>().ToList();

fail with an InvalidCastException?

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See this answer: Puzzling Enumerable.Cast InvalidCastException

In summary, Cast() works on the non-generic IEnumerable, which boxes each int as an Object. So, when the Cast is called it can only treat the elements as being of type Object, which cannot be cast to long.

The solution is to use Select to perform an explicit cast:

var numbers = Enumerable.Range(1,9999).Select(i=>(long)i).ToList();