c# 获取收藏夹目录到树型控件

private void ReportForm_Load(object sender, EventArgs e)
        {
            DirectoryInfo favfolder = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.Favorites));
            FileSystemInfo[] myFileSystemInfo = favfolder.GetFileSystemInfos();
            TreeNode RootNode = new TreeNode();
            RootNode.Text = "收藏夹";
          
            this.treeView1.Nodes.Add(RootNode);
            this.treeView1.ExpandAll();
            GetDir(myFileSystemInfo, RootNode);

        }
        private void GetDir(FileSystemInfo[] myFavDir, TreeNode RootNode)
        {
            string myStr = "";
            string myUrl = "";
            string myDesc = "";
            if (myFavDir == null)
            {
                throw new ArgumentNullException("myfavdir");
            }
            foreach (FileSystemInfo filesysteminfo in myFavDir)
            {
                TreeNode tn = new TreeNode();
                //文件目录
                if (filesysteminfo.GetType() == typeof(DirectoryInfo))
                {
                    tn.Text = filesysteminfo.Name;
                    RootNode.Nodes.Add(tn);
                    //强制转化为文件目录格式
                    DirectoryInfo childfile = (DirectoryInfo)filesysteminfo;　　
                    //递归调用
                    GetDir(childfile.GetFileSystemInfos(), tn);
                }
                //文件格式
                else if (filesysteminfo.GetType() == typeof(FileInfo))
                {
                    string fitler = ".url";
                    //过滤功能
                    if (filesysteminfo.FullName.ToLower().EndsWith(fitler.ToLower()))
                    {
                        using (StreamReader sr = new StreamReader(filesysteminfo.FullName, Encoding.Default))
                        {
                            myStr = sr.ReadLine();
                            while (myStr != null)
                            {
                                //获取URL地址
                                if (myStr.ToLower().StartsWith(URLPrefix))
                                {
                                    myUrl = myStr.Substring(URLPrefix.Length);

                                }
                                else if (myStr.ToLower().StartsWith(DescriptionPrefix))
                                {
                                    myDesc = myStr.Substring(DescriptionPrefix.Length);
                                }
                                myStr = sr.ReadLine();
                            }
                        }
                        TreeNode tnchild = new TreeNode();
                        tnchild.Text = filesysteminfo.Name;
                        tnchild.Tag = myUrl;
                        RootNode.Nodes.Add(tnchild);
                    }
                }
               
            }

        }