Lire le contenu d'un dossier en C#

Cet exemple de code vous montre comment analyser le contenu d'un dossier via la librairie .NET et son namespace System.IO. Comme vous allez le constater, l'algorithme proposé est récursif et une analyse des sous-dossiers sera effectuée.

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using System;
using System.IO;

namespace Listing
{
    class Program
    {
        static void ScanPath(string path, string level = "")
        {
            var metadata = File.GetAttributes(path);
            bool isDir = (metadata & FileAttributes.Directory) != 0;
            if (isDir)
            {
                var directoryInfo = new DirectoryInfo(path);
                Console.WriteLine(
                    "DIR {0,10}     {1,15} {2} {3}",
                    "",
                    directoryInfo.LastWriteTime.ToLocalTime(),
                    level,
                    directoryInfo.Name
                );
                foreach(var entry in directoryInfo.GetDirectories())
                {
                    ScanPath(entry.FullName, level + "    ");
                }
                foreach (var entry in directoryInfo.GetFiles())
                {
                    ScanPath(entry.FullName, level + "    ");
                }
            }
            else
            {
                var fileInfo = new FileInfo(path);
                Console.WriteLine(
                    "FILE {0,10} ko {1,15} {2} {3}",
                    fileInfo.Length / 1024,
                    fileInfo.LastWriteTime.ToLocalTime(),
                    level,
                    fileInfo.Name
                );
            }
        }


        static void Main(string[] args)
        {
            string[] paths = { "." };
            if (args.Length != 0) paths = args;

            foreach(string path in paths)
            {
                if (! File.Exists(path) && ! Directory.Exists(path))
                {
                    Console.Error.WriteLine($"Le dossier {path} n'existe pas");
                    continue;
                }

                Console.WriteLine($"--- Listing for {path} ---");
                ScanPath(path);
                Console.WriteLine("\n");
            }
        }
    }
}

Et voici un exemple d'exécution sur le dossier racine du projet Visual Studio.

$> Listing.exe ..\..\..
--- Listing for ..\..\.. ---
DIR                07/03/2021 21:24:05  Listing
DIR                07/03/2021 20:55:59      obj
DIR                07/03/2021 20:55:46          Debug
DIR                07/03/2021 21:24:11              netcoreapp3.1
FILE          1 ko 07/03/2021 21:18:17                  Listing.csproj.FileListAbsolute.txt
FILE          1 ko 07/03/2021 20:55:47                  Listing.AssemblyInfo.cs
FILE          0 ko 07/03/2021 20:56:01                  Listing.assets.cache
FILE        170 ko 07/03/2021 21:24:12                  apphost.exe
FILE          0 ko 07/03/2021 21:18:51                  Listing.csprojAssemblyReference.cache
FILE          5 ko 07/03/2021 21:24:11                  Listing.dll
FILE          0 ko 07/03/2021 20:55:47                  Listing.AssemblyInfoInputs.cache
FILE          0 ko 07/03/2021 20:55:47                  .NETCoreApp,Version=v3.1.AssemblyAttributes.cs
FILE          9 ko 07/03/2021 21:24:11                  Listing.pdb
FILE          0 ko 07/03/2021 21:18:09                  Listing.csproj.CoreCompileInputs.cache
FILE          0 ko 07/03/2021 21:18:16                  Listing.genruntimeconfig.cache
FILE          1 ko 07/03/2021 20:55:59          Listing.csproj.nuget.g.props
FILE          0 ko 07/03/2021 20:55:59          Listing.csproj.nuget.g.targets
FILE          0 ko 07/03/2021 20:55:59          project.nuget.cache
FILE          2 ko 07/03/2021 20:55:59          Listing.csproj.nuget.dgspec.json
FILE          2 ko 07/03/2021 20:55:59          project.assets.json
DIR                07/03/2021 20:55:46      bin
DIR                07/03/2021 20:55:46          Debug
DIR                07/03/2021 21:18:17              netcoreapp3.1
FILE          0 ko 07/03/2021 21:18:16                  Listing.deps.json
FILE          5 ko 07/03/2021 21:24:11                  Listing.dll
FILE          9 ko 07/03/2021 21:24:11                  Listing.pdb
FILE        170 ko 07/03/2021 21:24:12                  Listing.exe
FILE          0 ko 07/03/2021 21:18:17                  Listing.runtimeconfig.json
FILE          0 ko 07/03/2021 21:18:17                  Listing.runtimeconfig.dev.json
FILE          1 ko 07/03/2021 21:24:05      Program.cs
FILE          0 ko 07/03/2021 20:55:22      Listing.csproj

$>