Asp.net给站点某目录增加Aspnet用户

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.IO;
using System.Net;
using System.Security.AccessControl;
using System.Security.Principal;

public partial class ACLChange : System.Web.UI.Page
{
    //文件夹路径
    private string strDir = "images";

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            AddDirectorySecurity();
        }
    }

/// <summary>
    /// 给文件夹添加ASPNET用户
    /// </summary>
    private void AddDirectorySecurity()
    {
        DirectoryInfo dirinfo = new DirectoryInfo(Server.MapPath(strDir));

if ((dirinfo.Attributes & FileAttributes.ReadOnly) != 0)
        {
            dirinfo.Attributes = FileAttributes.Normal;
        }

//取得访问控制列表
        DirectorySecurity dirsecurity = dirinfo.GetAccessControl();

string strDomain = Dns.GetHostName();

dirsecurity.AddAccessRule(new FileSystemAccessRule(strDomain + "ASPNET", FileSystemRights.FullControl, AccessControlType.Allow));

dirinfo.SetAccessControl(dirsecurity);
    }
}

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