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Réponse acceptée !
Bonjour,
Checher dans la doc, est le meilleur moyen!

publicclass ShowDirSize
{
    publicstatic long DirSize(DirectoryInfo d)
    {   
        long Size = 0;   
        // Add file sizes.
        FileInfo[] fis = d.GetFiles();
        foreach (FileInfo fi in fis)
        {     
            Size += fi.Length;   
        }
        // Add subdirectory sizes.
        DirectoryInfo[] dis = d.GetDirectories();
        foreach (DirectoryInfo di in dis)
        {
            Size += DirSize(di);  
        }
        return(Size); 
    }
    publicstaticvoid Main(string[] args)
    {
        if (args.Length != 1)
        {
            Console.WriteLine("You must provide a directory argument at the command line.");   
        }
        else
        { 
            DirectoryInfo d = new DirectoryInfo(args[0]);
            Console.WriteLine("The size of {0} and its subdirectories is {1} bytes.", d, DirSize(d));
        }
    }
}

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