How can I enumerate an infinite sequence of integers in C#?

Jeremy 21 Reputation points

Is there a function in C# that returns an IEnumerator of the infinite sequence of integers [0, 1, 2, 3, 4, 5 ...]?

I'm currently doing

Enumerable.Range (0, 1000000000).Select (x => x * x).TakeWhile (x => (x <= limit))  

to enumerate all squares up to limit. I realize that this is effective, but if there's a built-in function that just counts up from 0, I would prefer to use it.

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  1. Thomas Levesque 76 Reputation points MVP

    Well, you can't really have an infinite sequence, since int only has 32 bits. But you can go up to int.MaxValue, using Enumerable.Range(0, int.MaxValue). There's no built-in function for this.

    13 people found this answer helpful.

  2. Kenneth Truyers 16 Reputation points

    Integers are not infinite, once you get to the end, it will overflow. So essentially the best you can do this:

    Enumerable.Range (0, int.MaxValue).Select (x => x * x).TakeWhile (x => (x <= limit))  

    If you want larger ranges, you could choose different types:

    Enumerable.Range (0, long.MaxValue).Select (x => x * x).TakeWhile (x => (x <= limit))  
    Enumerable.Range (0, double.MaxValue).Select (x => x * x).TakeWhile (x => (x <= limit))  

    Note that since you're squaring the values, the above samples would overflow at some point (namely at the square root of MaxValue).

    3 people found this answer helpful.
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