Question

Given a string

string result = "01234"

I want to get the separate integers 0,1,2,3,4 from the string.

How to do that?

1

The following code is giving me the ascii values

List<int> ints = new List<int>();

    foreach (char c in result.ToCharArray())
    {
        ints.Add(Convert.ToInt32(c));
    }

Answer 1

EDIT: I hadn’t spotted the “.NET 2.0” requirement. If you’re going to do a lot of this sort of thing, it would probably be worth using LINQBridge, and see the later bit – particularly if you can use C# 3.0 while still targeting 2.0. Otherwise:

List<int> integers = new List<int>(text.Length);
foreach (char c in text)
{
    integers.Add(c - '0');
}

Not as neat, but it will work. Alternatively:

List<char> chars = new List<char>(text);
List<int> integers = chars.ConvertAll(delegate(char c) { return c - '0'; });

Or if you’d be happy with an array:

char[] chars = text.ToCharArray();
int[] integers = Arrays.ConvertAll<char, int>(chars, 
                            delegate(char c) { return c - '0'; });

---

Original answer

Some others have suggested using ToCharArray. You don’t need to do that – string already implements IEnumerable<char>, so you can already treat it as a sequence of characters. You then just need to turn each character digit into the integer representation; the easiest way of doing that is to subtract the Unicode value for character ‘0’:

IEnumerable<int> digits = text.Select(x => x - '0');

If you want this in a List<int> instead, just do:

List<int> digits = text.Select(x => x - '0').ToList();