Sorting the result of Directory.GetFiles in C#

Question

I have this code to list all the files in a directory.

class GetTypesProfiler
{
    static List<Data> Test()
    {
        List<Data> dataList = new List<Data>();
        string folder = @"DIRECTORY";
        Console.Write("------------------------------------------\n");
        var files = Directory.GetFiles(folder, "*.dll");
        Stopwatch sw;
        foreach (var file in files)
        {   
            string fileName = Path.GetFileName(file);
            var fileinfo = new FileInfo(file);
            long fileSize = fileinfo.Length;
            Console.WriteLine("{0}/{1}", fileName, fileSize);
        }
        return dataList;
    }
    static void Main()
    {
         ...
    }
}

I need to print out the file info based on file size or alphabetical order. How can I sort the result from Directory.GetFiles()?

Answer 1

Very easy with LINQ.

To sort by name,

var sorted = Directory.GetFiles(".").OrderBy(f => f);

To sort by size,

var sorted = Directory.GetFiles(".").OrderBy(f => new FileInfo(f).Length);

Answer 2

To order by date: (returns an enumerable of FileInfo):

Directory.GetFiles(folder, "*.dll").Select(fn => new FileInfo(fn)).
                                    OrderBy(f => f.Length);

or, to order by name:

Directory.GetFiles(folder, "*.dll").Select(fn => new FileInfo(fn)).
                                    OrderBy(f => f.Name);

Making FileInfo instances isn't necessary for ordering by file name, but if you want to apply different sorting methods on the fly it's better to have your array of FileInfo objects in place and then just OrderBy them by Length or Name property, hence this implementation. Also, it looks like you are going to create FileInfo anyway, so it's better to have a collection of FileInfo objects either case.

Sorry I didn't get it right the first time, should've read the question and the docs more carefully.

Answer 3

You can use LINQ if you like, on a FileInfo object:

var orderedFiles =  Directory.GetFiles("").Select(f=> new FileInfo(f)).OrderBy(f=> f.CreationTime)

Answer 4

try this, it works for me

[System.Runtime.InteropServices.DllImport("Shlwapi.dll", CharSet = System.Runtime.InteropServices.CharSet.Unicode)]
private static extern int StrCmpLogicalW(string psz1, string psz2);
DirectoryInfo di = new DirectoryInfo(path);
FileInfo[] arrFi = di.GetFiles("*.*");
Array.Sort(arrFi, delegate(FileInfo x, FileInfo y) { return StrCmpLogicalW(x.Name, y.Name); });

Answer 5

This works if you only need to sort by file name and the file title supports the ascending or descending logical order.I add variables to have a bit more control of the source and search pattern.

Using Dir = System.IO;

string Source = yourVariable;
string SearchPattern = yourVariable;

Dir.Directory.GetFiles(Source, SearchPattern, Dir.SearchOption.AllDirectories).OrderBy(s => s).ToList();

Answer 6

// Getting Directory object
DirectoryInfo directoryInfo = new DirectoryInfo(folderName);

// getting files for this folder
FileInfo[] files = directoryInfo.GetFiles();

// Sorting using the generic Array.Sort function based on Names comparison
Array.Sort(files, delegate (FileInfo x, FileInfo y) { return String.Compare(x.Name, y.Name); });

// Sorting using the generic Array.Sort function based on the creation date of every folder
Array.Sort(files, delegate (FileInfo x, FileInfo y) { return DateTime.Compare(x.CreationTime, y.CreationTime); });

Array Sort