c#设置目录权限（.net控制alc）

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using System;
using System.Collections;
using System.IO;
using System.Security.AccessControl;
static class Tester
{

    public static void Main()
    {
        try
        {
            string filename = @"d:/k"; //目标目录
            string account = @"wch";//用户名
            string userrights = @"R";//权限字符串，自己定义的
            AddDirectorySecurity(filename, account, userrights);
            Console.ReadLine();
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            Console.ReadLine();
        }
    }

    static public void AddDirectorySecurity(string FileName, string Account, string UserRights)
    {
        FileSystemRights Rights = new FileSystemRights();

        if (UserRights.IndexOf("R") >= 0)
        {
            Rights = Rights | FileSystemRights.Read;
        }
        if (UserRights.IndexOf("C") >= 0)
        {
            Rights = Rights | FileSystemRights.ChangePermissions;
        }
        if (UserRights.IndexOf("F") >= 0)
        {
            Rights = Rights | FileSystemRights.FullControl;
        }
        if (UserRights.IndexOf("W") >= 0)
        {
            Rights = Rights | FileSystemRights.Write;
        }

        bool ok;
        DirectoryInfo dInfo = new DirectoryInfo(FileName);
        DirectorySecurity dSecurity = dInfo.GetAccessControl();
        InheritanceFlags iFlags = new InheritanceFlags();
        iFlags = InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit;
        FileSystemAccessRule AccessRule2 = new FileSystemAccessRule(Account, Rights, iFlags, PropagationFlags.None, AccessControlType.Allow);
        dSecurity.ModifyAccessRule(AccessControlModification.Add, AccessRule2, out ok);

dInfo.SetAccessControl(dSecurity);

        //列出目标目录所具有的权限
        DirectorySecurity sec = Directory.GetAccessControl(FileName, AccessControlSections.All);
        foreach (FileSystemAccessRule rule in sec.GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount)))
        {
            Console.WriteLine("----------------------------------");
            Console.WriteLine(rule.IdentityReference.Value);
            if ((rule.FileSystemRights & FileSystemRights.Read) != 0)
                Console.WriteLine(rule.FileSystemRights.ToString());

        }
        Console.Read();
    }

}