I would like to count of each unique letter in a string by using c#.net

I would like to write a problem to read a text file from command line and to output the count of each unique letter, sorted a开发者_如何转开发lphabetically. Any suggestions for this program in C# Example :

Stack overflows

Output :

a 1 c 1 k 1 t 1 s 2

As others have said, it sounds like homework. I'll just give you some hints:

• Split the task up. There's no need for the "processing" code to depend on the input coming from a file, or the output going to the screen.
• If you're allowed to, look at LINQ which provides sorting, grouping and counting functionality in a very easy-to-use way.
• For bonus points, implement unit tests for the processing part...

Using LINQ, one way to get the unique characters is:

string s = "Stack Overflows";

var x = from c in s.ToLower()
        group c by c into a
        select new { a.Key, Count = a.Count() };

        string s = "stack overflows";
        Dictionary<char, int> dic = new Dictionary<char, int>();

        foreach (char x in s)
        {

            if (dic.ContainsKey(x) == true) 
            {

                dic[x] += 1;
            }
            else
            {
                dic.Add(x, 1);

            }

        }
        foreach (KeyValuePair<char, int> x in dic)
        {

            Console.WriteLine(x.Key + " " + x.Value);

        }

class Test {

    static void Main(string[] args)
    {
        string inputstring = "stackOverflows";
        charcount(inputstring, inputstring.ToCharArray()[0]);
    }

    public static void charcount(string recstring ,char c )
    {
        if (recstring.Length != 0)
        {
            int count = 0;
            foreach (char c1 in recstring)
            { if (c1==c)
            {

                count++;
            }

            }
            Console.WriteLine(c+"  "+count);
            string tempstring = recstring.Replace(char.ToString(c), "");
            if (tempstring.Length != 0)
            {
                charcount(tempstring, tempstring.ToCharArray()[0]);
            }
        }

    }