Lines of Code

Below is the complete code for the Lines of Code Try It Out! problem.

The StringExtensions Class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ExtensionMethods
{
    /// <summary>
    /// A place to put extension methods for the string type.
    /// </summary>
    public static class StringExtensions
    {
        /// <summary>
        /// Counts the number of words in a string and returns it.
        /// </summary>
        public static int WordCount(this string text)
        {
            return text.Split(' ').Length;
        }

        /// <summary>
        /// Counts the number of sentences in a string. Note that this
        /// is definitely an oversimplification, as there are other uses
        /// for the '.' character than ending sentences. This method
        /// ignores ellipses that are represented as "...".
        /// </summary>
        public static int SentenceCount(this string text)
        {
            text = text.Replace("...", "");
            return text.Split('.').Length;
        }

        /// <summary>
        /// Counts the number of paragraphs in a string. Paragraphs
        /// are assumed to be delimited by the new line character
        /// ('\n').
        /// </summary>
        public static int ParagraphCount(this string text)
        {
            return text.Split('\n').Length;
        }
    }
}

The Program Class

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

namespace ExtensionMethods
{
    class Program
    {
        static void Main(string[] args)
        {
            string directory = "C:/Full/Path/Of/Directory/Here";
            Console.WriteLine(CountLinesOfCode(directory));
            Console.ReadKey();
        }

        /// <summary>
        /// Totals up all of the lines of code in all of the files in a
        /// particular directory. This method is used recursively, so
        /// any directory contained within this directory will be counted
        /// up by another call to this method.
        /// </summary>
        /// <param name="directory"></param>
        /// <returns></returns>
        public static int CountLinesOfCode(string directory)
        {
            // Start at 0.
            int count = 0;

            // Go through each child directory that is contained within
            // this directory and add up their lines of code.
            foreach (string child in Directory.GetDirectories(directory))
            {
                count += CountLinesOfCode(child);
            }

            // Go through each file in this directory...
            foreach (string file in Directory.GetFiles(directory))
            {
                // ... and if they're a .cs file...
                if (file.EndsWith(".cs"))
                {
                    // include the number of lines in that file.
                    count += CountLinesOfCodeInFile(file);
                }
            }

            return count;
        }

        /// <summary>
        /// Counts the number of lines in a file. This does not account
        /// for blank lines or lines that are just comments.
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public static int CountLinesOfCodeInFile(string file)
        {
            return File.ReadAllText(file).ParagraphCount();

            // or alternatively...
            // return File.ReadAllLines(file).Length;
        }
    }
}