find duplicated files

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hi every one

i am trying to make project that find all duplicated files in directory

first step i want to get all files in this directory and its subdirectories

so i tried this code

C#

List<string> enumeratedFiles = Directory.EnumerateFiles(@"d:\", "*.*", SearchOption.AllDirectories)
                .Where(str => str.Contains(".")).AsParallel().ToList();

but i get this error
Access to the path 'd:\System Volume Information\' is denied.

i Know that i can't Access to this directory
but is there and way to skip this directory and continue

thanks for all

Posted 5-Apr-13 6:53am

dabbourabd

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Matt T Heffron 5-Apr-13 13:13pm

I don't think there is any way to skip the directories with permission issues.
I think you will need to recursively traverse the directory structure in your own implementation, skipping directories/files with permission problems.
(Since this will be I/O bound, not CPU bound, I don't think it is a good candidate for parallization.)

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**Zoltán Zörgő** · Answer 1 · 2013-04-05T07:03:00

Solution 1

As I know there is no built-in feature to handle access denied exceptions. You will have to do the recursion manually.
A good example can be found http://stackoverflow.com/questions/172544/ignore-folders-files-when-directory-getfiles-is-denied-access:

C#

using System;
using System.IO;
static class Program
{
    static void Main()
    {
        string path = ""; // TODO
        ApplyAllFiles(path, ProcessFile);
    }
    static void ProcessFile(string path) {/* ... */}
    static void ApplyAllFiles(string folder, Action<string> fileAction)
    {
        foreach (string file in Directory.GetFiles(folder))
        {
            fileAction(file);
        }
        foreach (string subDir in Directory.GetDirectories(folder))
        {
            try
            {
                ApplyAllFiles(subDir, fileAction);
            }
            catch
            {
                // swallow, log, whatever
            }
        }
    }
}

You will have to refine this to match your filtering.

Posted 5-Apr-13 7:03am

Zoltán Zörgő

Updated 5-Apr-13 7:20am

v2

Comments

dabbourabd 5-Apr-13 16:49pm

thank for replaying

now i using this code

Collapse | Copy Code

List<string> DirSearch(string sDir)
{
List<string> filesPathes = new List<string>();

try
{
foreach (string f in Directory.GetFiles(sDir))
{

filesPathes.Add(f);
All_files[1].Add(f);
All_files[0].Add(f.Substring(f.LastIndexOf("\\")+1));
txtcurrentfile.Text = f;
}

foreach (string d in Directory.GetDirectories(sDir))
{
filesPathes.AddRange(DirSearch(d));
}
}
catch
{
}

return filesPathes;
}

but my problem is time because i am talking about 300000 files
so i takes about 2 minutes to get all files list
but i am trying to reduce the time by using

Collapse | Copy Code

List<string> enumeratedFiles = Directory.EnumerateFiles(@"d:\", "*.*", SearchOption.AllDirectories)
.Where(str => str.Contains(".")).AsParallel().ToList();

because its much faster so i am trying to skip error like i said before

Zoltán Zörgő 6-Apr-13 2:25am

Yeah, if you don't read my answer, why do you reply? I have said you can not do error handling that way. But you can incorporate parallelism in your original method and in the method I have given.