CODEWITHSUNDEEP
c#
Alexandre
Alexandre

Reputation: 2025

Make a backup of files

So, I make a program to make a backup of some particular file, with particular extensions, so, I enter with List or array with the extensions of I whant to make a backup

List<string> extensions = new List<string>();
extensions.Add("*.pdf");
extensions.Add("*.txt");
extensions.Add("*.inf");
extensions.Add("*.doc");
extensions.Add("*.cpp");
extensions.Add("*.cs");
extensions.Add("*.vb");

Ok, but, how I can make the search system, to find the files with that extensions in folders..

the search system is simple:

    public void DirSearch(string sDir)
    {
        try
        {
            foreach (string d in Directory.GetDirectories(sDir))
            {
                foreach (string f in Directory.GetFiles(d, "*.pdf"))
                {
                    Console.WriteLine(f);
                }
                DirSearch(d);
            }
        }
        catch (System.Exception excpt)
        {
            Console.WriteLine(excpt.Message);
        }
    }

Ok, but, how I can make this to search for all extensions in list ( to make a most rapid system ), and, the program can not enter on windows folder..., if I set the sDir = "C:\"

Upvotes: 1

Views: 1340

Answers (5)

cuongle
cuongle

Reputation: 75306

Use overload GetFile with option SearchOption.AllDirectories, so you don't need to call recursively, also use LINQ with SelectMany:

var result = extensions.SelectMany(e => 
                       Directory.GetFiles(sDir, e, SearchOption.AllDirectories));

Update: To ignore protected folder, you can use try catch to skip exception:

private string[] GetFiles(string directory, string pattern)
{
    try
    {
        return Directory.GetFiles(directory, pattern, 
                                       SearchOption.AllDirectories);
    }
    catch (Exception)
    {
        return new string[0];
    }
}

So:

var result = extensions.SelectMany(e => GetFiles(sDir, e));

Upvotes: 1

ZombieSheep
ZombieSheep

Reputation: 29953

It may be slightly more performant to call GetFiles(string Directory) and get the results back into a single list, and then parse that. The following snippet should do what you need...

var extensions = new List<string> { ".pdf", ".txt", ".inf", ".doc", ".cpp", ".cs", ".vb" };
var files = Directory.GetFiles(topLevelFolder, "*.*", SearchOption.AllDirectories);
var matching = new List<string>();
foreach (var ext in extensions)
{
    matching.AddRange(files.Where(f => f.EndsWith(ext)));
}

Upvotes: 0

Ash Burlaczenko
Ash Burlaczenko

Reputation: 25435

You can supply multiple search criteria but seperating the value with a semi-colon

*.vb;*.txt

So you can simply generate the search string using the list

var search = string.Join(";", extensions.ToArray());
...
foreach (string f in Directory.GetFiles(d, search))
{
    ...
}

Upvotes: 0

VladL
VladL

Reputation: 13033

You don't need an extra loop or recursion, just use overloaded Directory.GetFiles which will get all file names recursively 

    public void DirSearch(string sDir)
    {
        try
        {
            foreach (string item in extensions)
            {
                string[] files = Directory.GetFiles(sDir, item, SearchOption.AllDirectories);

                foreach (var file in files)
                {
                    Console.WriteLine(file);
                }
            }
        }
        catch (System.Exception excpt)
        {
            Console.WriteLine(excpt.Message);
        }
    }

Upvotes: 0

Grant Thomas
Grant Thomas

Reputation: 45083

To simply extend what you have you're going to need another loop, one that iterates the extensions and calls GetFiles based on the current, though "to make a most rapid system" is highly ambitious at this level. Anyway,...

foreach (string d in Directory.GetDirectories(sDir)) {
  foreach (string e in extensions) {
    foreach (string f in Directory.GetFiles(d, e)) {

    }
  }
}

Upvotes: 1

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