DirectoryInfo的用法（怎么判断文件只读）

 protected void Page_Load(object sender, EventArgs e)
        {
            string path = Server.MapPath("~");
            DirectoryInfo dirInfo = new DirectoryInfo(path);
           
            // 获取当前文件夹中含有'd'这个字母的文件或者文件夹
            FileSystemInfo[] fileSystemList = dirInfo.GetFileSystemInfos("*d*");

            DataTable dt = new DataTable();
            dt.Columns.Add("文件名",typeof(string));
            dt.Columns.Add("创建时间", typeof(DateTime));
            dt.Columns.Add("是否只读", typeof(bool));
            dt.Columns.Add("文件全名", typeof(string));
            dt.Columns.Add("是否是根目录", typeof(string));

            foreach (FileSystemInfo fis in fileSystemList)
            {
                DataRow row = dt.NewRow();
                row["文件名"] = fis.Name;
                row["创建时间"] = fis.CreationTime;
                row["是否只读"] = (fis.Attributes & FileAttributes.ReadOnly) == 0 ? false : true;
                row["文件全名"] = fis.FullName;
                row["是否是根目录"] = (fis.Attributes & FileAttributes.Directory) == 0 ? false :

                                       true;
                dt.Rows.Add(row);
            }

            this.GridView1.DataSource = dt;
            this.GridView1.DataBind();
        }