12.09 - Sitemap creator (v2) 🚀 Exercises C#

A "sitemap" is a file that webmasters can use in order to tell Google the webpages that their site consists on, and get a better positioning in the search engine.

Its basic appearance is:

<?xml version="1.0" encoding="utf-8"?>

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">;

<url>

<loc>http://miweb.com/</loc>;

<changefreq>daily</changefreq>

</url>

<url>

<loc>http://miweb.com/apartado1</loc>;

<changefreq>weekly</changefreq>

</url>

</urlset>

You must create a program which will receive as parameters the name of a text file containing the URLs, the modification date and the frequency of changes:

sitemapCreator urls.txt 2011-11-18 weekly

The text file would contain the list of the names of the files to be indexed, each line in a different line:

http://www.exercisescsharp.blogspot.com
http://www.exercisescsharp.blogspot.com/FirstExercises.html

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

class SitemapCreator2
{
    static void Main(string[] param)
    {
        if (param.Length != 3) 
        {
            Console.WriteLine("Error number of params.");
            return;
        }

        string file = param[0];
        string date = param[1];
        string frecuency = param[2];

        List ListUrls = GetUrls(file);

        CreateSiteMap(ListUrls, frecuency, date);
    }


    static void CreateSiteMap(List listHtml, string frecuency, string lastUpdated) 
    {
        try 
        {
            StreamWriter writer = new StreamWriter(File.Create("sitemap.xml"));
            
            writer.WriteLine("");
            writer.WriteLine("");

            foreach (string html in listHtml) 
            {
                writer.WriteLine("");
                writer.WriteLine("" + html + "");
                writer.WriteLine("" + lastUpdated + "");
                writer.WriteLine("" + frecuency + "");
                writer.WriteLine("");
            }

            writer.WriteLine("");

            writer.Close();
        }
        catch
        {
            Console.WriteLine("Error writing sitemap.");
        }
    }

    static List GetUrls(string nameFile) 
    {
        try
        {
            StreamReader reader = new StreamReader(File.OpenRead(nameFile));
            string line = "";
            List urls = new List();

            do
            {
                line = reader.ReadLine();

                if (line != null) 
                {
                    urls.Add(line);
                }
            }
            while( line != null);

            reader.Close();
            
            return urls;
        }
        catch
        {
            Console.WriteLine("Error reading file.");

            return null;
        }
    }
}