浏览文件夹时筛过滤选系统无权限、隐藏、系统、临时文件夹

有时在遍历系统文件夹时，对于系统的隐藏的某些文件无法访问，需要提前判断过滤

public  void GetDirectoryFold(string Path,TreeNode rootNode)
        {
            DirectoryInfo directory = new DirectoryInfo(rootNode.Tag.ToString());

            try
            {
                foreach (DirectoryInfo dir in directory.GetDirectories())
                {
                    {
                        #region   //对系统的、临时的、隐藏文件夹判断筛选不处理 
                        if ((dir.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden)
                        {
                            continue;
                        }
                        else if ((dir.Attributes & FileAttributes.System) == FileAttributes.System)

                        {
                            continue;
                        }
                        else if ((dir.Attributes & FileAttributes.Temporary) == FileAttributes.Temporary)
                        {
                            continue;
                        }
                        else if (dir.Attributes != FileAttributes.Directory)
                        {
                            continue;
                        }
                        if (!hasWriteAccessToFolder(dir.FullName))
                        {
                            continue;
                        }
                        #endregion
                        else
                        {
                            TreeNode dirNode = new TreeNode();
                            dirNode.Tag = dir.FullName;
                            dirNode.Text = dir.Name;
                            dirNode.SelectedImageIndex = IconIndex.OpenFold;
                            dirNode.ImageIndex = IconIndex.CloseFold;
                            rootNode.Nodes.Add(dirNode);
                            GetDirectoryFold(dir.FullName, dirNode);
                        }
                    }
                }
            }
            catch(Exception ex)
            {
                throw ex;
            }
            
        }

        #region    //判断是否有权限访问文件夹
        private bool hasWriteAccessToFolder(string PathFolder)
        {
            try
            {
                System.Security.AccessControl.DirectorySecurity directorySecurity = Directory.GetAccessControl(PathFolder);
                return true;
            }
            catch (UnauthorizedAccessException)
            {
                return false;
            }
        }
        #endregion