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Enumerable.Range implementation

What is the precise implementation of Enumerable.Range in .Net; preferable .Net 4? Is it a yielded for-loop? A custom implementation (IEnumerable, IEnumerator) or?

Solution

  • The accepted answer on this question should give you the answer:

    public static class Enumerable {
    public static IEnumerable<int> Range(int start, int count) {
        var end = start + count;
        for(var current = start; current < end; ++current) {
            yield return current;
        }
    }
}

    This isn't the exact code, as there is a lot of error checking etc. going on within the Range method, and internally, it calls other methods, however, the quoted code above is the "essence" of the Range routine.

    Examining the code in Reflector should provide you with far more information.