I'm trying to get a decent solution to inserting code in blog articles so the next few posts are all about the code. The sample below is a simple line counter tool I use to work out some metrics for code reviews.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace LineCount
{
    class Program
    {
        private static int folders;
        private static int files;
        private static int lines;
        private static int code;
        private static int comments;

        static void Main(string[] args)
        {
            if (args.Length == 0)
            {
                Console.WriteLine(@"
Usage: linecount <root folder>

e.g. linecount t:\dev\projects\main

NB: Only .cs files are considered
    Review time is hard coded to 200 lines per hour
");
                return;
            }

            CountLines(new DirectoryInfo(args[0]));

            Console.WriteLine("FOLDERS:{0} FILES:{1} LOC:{2} SLOC:{3} COMMENTS:{4}", 
                folders, files, lines, code, comments);
            Console.WriteLine("Code density: {0:p}", 
                (double)code / (double)lines);
            Console.WriteLine("Comment density: {0:p}", 
                (double)comments / (double)lines);
            Console.WriteLine("Comment ratio: {0:p}", 
                (double)comments / (double)code);
            Console.WriteLine("Estimated review time: {0}h", 1+ (code / 200));
        }

        private static void CountLines(DirectoryInfo parent)
        {
            ++folders;

            foreach (DirectoryInfo folder in parent.GetDirectories())
            {
                CountLines(folder);
            }

            foreach (FileInfo file in parent.GetFiles())
            {
                CountLines(file);
            }
        }

        private static void CountLines(FileInfo file)
        {
            switch (file.Extension)
            {
                case ".cs":
                    break;
                default:
                    return;
            }

            ++files;

            using (StreamReader reader = file.OpenText())
            {
                string line = null;
                bool inComment = false;

                while ((line = reader.ReadLine()) != null)
                {
                    ++lines;
                    line = line.Trim();

                    if (line.Length == 0)
                        continue;

                    if (line.StartsWith("//"))
                    {
                        if (line.Replace("//", "").Trim().Length > 0)
                            ++comments;

                        continue;
                    }

                    if (line.StartsWith("/*"))
                        ++comments;
                    else if (!inComment)
                        ++code;

                    if (line.Contains("/*"))
                    {
                        inComment = true;
                    }

                    if (inComment && line.Contains("*/"))
                    {
                        inComment = false;
                    }
                }
            }
        }
    }
}