To
Allows enumaration of sets of characters by expressing them as a range, for example all the lowercase characters. Allows reverse order as well.
Source
public static class EnumerableExtensions
{
private static void Swap(ref char a, ref char b)
{
a ^= b;
b ^= a;
a ^= b;
}
public static IEnumerable<char> To(this char first, char last)
{
bool reverseRequired = (first > last);
if (reverseRequired)
Swap(ref first, ref last);
var result = Enumerable.Range(first, last - first + 1).Select(charCode => (char)charCode);
if (reverseRequired)
result = result.Reverse();
return result;
}
}Example
foreach (char c in 'a'.To('z'))
Console.WriteLine(c);
foreach (char c in '0'.To('9'))
Console.WriteLine(c);