Method 1 involves recursion. I saw a sample at http://www.gfilter.net/default.aspx?Post=Code-Snippet-of-the-Day%3a-Recursive-File-Finder and MSDN.

Method 2 involves using a stack to process subdirectories in a Last in, first out manner.  I saw this from http://dotnetperls.com/Content/Recursively-Find-Files.aspx.

The result from finding all 13,300+ DLLs in c:\windows and all subdirectories:

FileFinderRecursive Elapsed: 6876ms.
FileFinderStack Elapsed: 5725ms.

The stack method was almost 20% faster.

Here’s some code from a quick C# console app I just wrote to compare the two:

class Program
{
    static void Main(string[] args)
    {
        Stopwatch s;
        IFinder finder;
        string startDir = @"c:\windows";
        string matchType = "*.dll";

        //Test Recursion method
        s = Stopwatch.StartNew();
        finder = new FileFinderRecursive();
        var filesRecursive = finder.Find(startDir, matchType);
        s.Stop();
        Console.WriteLine("FileFinderRecursive Elapsed: " + s.ElapsedMilliseconds + "ms.");

        //Test Stack method
        s = Stopwatch.StartNew();
        finder = new FileFinderStack();
        var filesStack = finder.Find(startDir, matchType);
        s.Stop();
        Console.WriteLine("FileFinderStack Elapsed: " + s.ElapsedMilliseconds + "ms.");    

        Console.Read();
    }
}
public interface IFinder
{
    List<FileInfo> Find(string startDir, string matchType);
}

/// <summary>
/// Recursively finds a list of files that match the specified critiria
/// </summary>
public class FileFinderRecursive : IFinder
{
    private Dictionary<FileInfo, int> files;

    public List<FileInfo> Find(string startDir, string matchType)
    {
        files = new Dictionary<FileInfo, int>();
        findFiles(startDir, matchType);

        return files.Keys.ToList();
    }

    private void findFiles(string startDir, string matchType)
    {
        DirectoryInfo d = new DirectoryInfo(startDir);
        FileInfo[] fileInfos;
        try
        {
            fileInfos = d.GetFiles(matchType);
        }
        catch
        {
            return; //most likely Access Exception.  BAIL!
        }
        foreach (FileInfo f in fileInfos)
        {
            if (!files.ContainsKey(f))
            {
                files.Add(f, 0);
            }
        }

        if (d.GetDirectories().Length > 0)
        {
            foreach (DirectoryInfo subD in d.GetDirectories())
            {
                findFiles(subD.FullName, matchType);
            }
        }
    }
}

/// <summary>
/// Finds a list of files that match the specified criteria using a stack
/// </summary>
public class FileFinderStack : IFinder
{
    public List<FileInfo> Find(string startDir, string matchType)
    {
        DirectoryInfo dirStart = new DirectoryInfo(startDir);
        List<FileInfo> result = new List<FileInfo>();
        Stack<DirectoryInfo> stack = new Stack<DirectoryInfo>();
        stack.Push(dirStart);
        while (stack.Count > 0)
        {
            DirectoryInfo dir = stack.Pop();
            try
            {
                result.AddRange(dir.GetFiles(matchType));
                DirectoryInfo[] subDirs = dir.GetDirectories();
                foreach (DirectoryInfo dn in subDirs)
                {
                    stack.Push(dn);
                }
            }
            catch { }
        }
        return result;
    }
}

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Main Card:

• Rashad Evans (18-0-1) Vs. Lyoto Machida (14-0)

Preliminary Card:

• Matt Hughes Vs. Matt Serra
• James Irvin Vs. Drew McFedries
• Yushin Okami Vs. Dan Miller
• Sean Sherk Vs. Frank Edgar

Undercard:

• Brock Larson Vs. Chris Wilson
• Pat Barry Vs. Tim Hague
• Phillipe Nover Vs. Kyle Bradley
• Houston Alexander Vs. Andre Gusmao
• Yoshiyuki Yoshida Vs. Brandon Wolff
• Dave Kaplan Vs. George Roop

When I find a site hosting a live streaming feed, I’ll make sure to update this post.

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Go ahead, click the following link for more information on how to get your free license.

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She also has a website and blog.  Check them out at http://www.KarenZalamea.Com and http://karenzalamea.blogspot.com/

Here’s the Press Release:

—————————————————–

Montréal, Wednesday, May 6, 2009 – The Sylvie and Simon Blais Foundation is pleased to announce the name of the first recipient of the Sylvie and Simon Blais Award for Emerging Visual Artists. Karen Zalamea, currently at work on an MFA with a concentration in Photography at Concordia University, has the honour of receiving this award. The Foundation would also like to salute Meghan Price (Concordia University) and Stéphane Dionne (UQÀM), who were among the three finalists for the award. We were very happy with the high quality of the seventeen applications received, which made the jury’s final decision an extremely difficult one.

First and foremost a photographer, Karen Zalamea has broadened her practice to include video, performance and installations. This young artist explores the notion of work—which she depicts as a physical experience involving repeated gestures and exertions—as it defines men and women’s relationships with others and with the world around them.

The members of the jury, John R. Porter, Honorary Director of the Musée national des beaux-arts du Québec, Lise Lamarche, art historian, Josée Drouin-Brisebois, Curator of Contemporay Art at the National Gallery of Canada, Éliane Excoffier, photographer and Simon Blais, met to select the recipient of the award on April 23. An exhibition of works by Karen Zalamea will be held at Galerie Simon Blais from August 5 to September 5 of this year.

Sylvie and Simon Blais wanted to commemorate their gallery’s 20th anniversary by making a direct contribution to the community. This led to the creation of the Sylvie and Simon Blais Foundation and the establishment of the Sylvie and Simon Blais Award for Emerging Visual Artists. This award—the only one of its kind in Québec—aims to promote and publicize the work of young artists by providing a student in a Master of Fine Arts program at a Québec university with a scholarship and a professional-level solo exhibition at Galerie Simon Blais during the month of August 2009. We are proud to have been able to put together a jury made up of very distinguished members of the art scene, who determined the recipient of the award from among the seventeen applications we received, declared Simon Blais, President of the Foundation.

– 30 –

For further information:  Simon Blais, 514 849-1165

• • Galerie Simon Blais, 5420 Saint-Laurent Boulevard (north of Fairmount),
    Montréal

• • Tuesday–Friday, 10 a.m. to 6 p.m., Saturday, 10 a.m. to 5 p.m.

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Part 1:

Part 2:

Part 3:

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