C#

Eddy Vluggen wrote:

To my limited knowledge, that would make the file completely "undeletable"?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.DirectoryServices;
using System.IO;
using System.Security.AccessControl;
using System.Security.Principal;

namespace AppPoolEnum
{
    class Program
    {

        private static void Main(string[] args)
        {
            String filePath = @"D:\Temp\Manfred\Delete-3-Test";
            String accountName = String.Format("Administrators");

            // Create if not existant
            if (!Directory.Exists(filePath))
                Directory.CreateDirectory(filePath);

            setNoDeleteChildren(filePath, accountName);

            String fileOne = String.Format("{0}\\{1}", filePath, "File-One.txt");
            String fileTwo = String.Format("{0}\\{1}", filePath, "File-Two.txt");

            // Create the files
            File.Create(fileOne).Dispose();
            File.Create(fileTwo).Dispose();

            // Check that the two files are there
            if (File.Exists(fileOne) && File.Exists(fileTwo))
                Console.WriteLine("Both files {0} and {1} exist!", fileOne, fileTwo);

            // Set only second file to undeleteable
            setNoDeleteFile(fileTwo, accountName);

            // Try to delete the files
            File.Delete(fileOne);
            File.Delete(fileTwo);

        }

        private static void setNoDeleteFile(String path, String account)
        {
            // current security object
            FileSecurity security = File.GetAccessControl(path);

            // add rule
            security.AddAccessRule(new FileSystemAccessRule(account, FileSystemRights.Delete, AccessControlType.Deny));

            // set access
            File.SetAccessControl(path, security);
        }

        private static void setNoDeleteChildren(String path, String account)
        {
            // current security object
            DirectorySecurity security = Directory.GetAccessControl(path);

            // add rule
            security.AddAccessRule(new FileSystemAccessRule(account, FileSystemRights.DeleteSubdirectoriesAndFiles, AccessControlType.Deny));

            // set access
            Directory.SetAccessControl(path, security);
        }
    }
}

BillWoodruff wrote:

instead of actually deleting the file move the file to a special folder.