Find character with most occurrences in string?

Question

For example, I have a string:

\"abbbbccd\"

b has the most occurrences. When using C++, the easiest way to handle this is inser

Answer 1

This because someone asked for a 2.0 version, so no LINQ.

Dictionary dict = new Dictionary();

int max = 0;

foreach (char c in "abbbbccccd")
{
    int i;
    dict.TryGetValue(c, out i);
    i++;
    if (i > max)
    {
        max = i;
    }
    dict[c] = i;
}

foreach (KeyValuePair chars in dict)
{
    if (chars.Value == max)
    {
        Console.WriteLine("{0}: {1}", chars.Key, chars.Value);
    }
}

Instead this for the LINQ version. It will extract paired "bests" (aaaabbbb == a, b). It WON'T work if str == String.Empty.

var str = "abbbbccccd";

var res = str.GroupBy(p => p).Select(p => new { Count = p.Count(), Char = p.Key }).GroupBy(p => p.Count, p => p.Char).OrderByDescending(p => p.Key).First();

foreach (var r in res) {
    Console.WriteLine("{0}: {1}", res.Key, r);
}