How to write an anagram generator in pure C# and .Net framework [closed]

Answer 1

try this

public static IEnumerable Permutations(this string text)
{
    return PermutationsImpl(string.Empty, text);
}

private static IEnumerable PermutationsImpl(string start, string text)
{
    if (text.Length <= 1)
        yield return start + text;
    else
    {
        for (int i = 0; i < text.Length; i++)
        {
            text = text[i] +
                    text.Substring(0, i) +
                    text.Substring(i + 1);
            foreach (var s in PermutationsImpl(start +
                text[0], text.Substring(1)))
                yield return s;
        }
    }
}

then simply use this extension method this way

string text = "CAT";
List perms = text.Permutations().ToList();