エクスプローラーで見れないフォルダ・ファイルの作り方(Windows/.NET/C#)

Program.cs

using System.IO;

namespace HiddenFolderMaker
{
    class Program
    {
        static void Main(string[] args)
        {
            var path = @"C:\temp\hidden2\";

            Directory.CreateDirectory(path);

            var directoryInfo = new DirectoryInfo(path);
            directoryInfo.Attributes |= System.IO.FileAttributes.Hidden;
            directoryInfo.Attributes |= System.IO.FileAttributes.System;

            var filepath = Path.Combine(path, "naisyo.txt");

            File.CreateText(filepath);

            var file_attr = File.GetAttributes(filepath);

            File.SetAttributes(filepath,file_attr | FileAttributes.Hidden);
            File.SetAttributes(filepath, file_attr | FileAttributes.System);
        }
    }
}