递归法绑定文件夹到导航树&在指定文件夹下新建文件夹

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        if (Request.QueryString["listName"] != null)
        {
            BindLibConstruct(Request.QueryString["listName"]);
        }
    }
}

//利用递归法将指定的文档库（这里是Document Library）绑定到treeview上
public void BindLibConstruct(string listName)
{
    SPWeb web = SPContext.Current.Web;
    SPList list = web.Lists[listName];
    SPFolderCollection folders = list.RootFolder.SubFolders;

    //将文档库设为根节点（文档库本身也是一个文件夹）
    TreeNode rootNode = new TreeNode();
    rootNode.Text = list.RootFolder.Name;
    rootNode.Value = list.RootFolder.UniqueId.ToString();
    trvwLibConstruct.Nodes.Add(rootNode);

    foreach (SPFolder folder in folders) //遍历第一级的文件夹
    {
        if (folder.Name == "Forms")//去掉默认的系统文件夹
        {
            continue;
        }
        TreeNode parentnode = new TreeNode();
        parentnode.Text = folder.Name;
        parentnode.Value = folder.UniqueId.ToString();//将文件夹得GUID存入到节点的value中
        rootNode.ChildNodes.Add(parentnode);
        ChildDocFolder(folder, parentnode); //遍历第一级文件夹下的每一个文件夹
    }
}

/// <summary>
/// 递归方法读取文档库
/// </summary>
/// <param name="folder">父文件夹</param>
/// <param name="currentNode">当前节点</param>
private void ChildDocFolder(SPFolder folder, TreeNode currentNode)
{
    string url = SPContext.Current.Web.Url;
    if (folder.SubFolders.Count == 0)// //如果不存在子文件夹就返回
    {
        return;
    }
    else
    {
        foreach (SPFolder spfolder in folder.SubFolders)
        {
            if (spfolder.Name == "Forms")//去掉默认的系统文件夹
            {
                continue;
            }
            TreeNode node = new TreeNode();
            node.Text = spfolder.Name;
            node.Value = spfolder.UniqueId.ToString();
            currentNode.ChildNodes.Add(node);//添加当前文件夹到TreeView中
            //node.Parent.SelectAction = TreeNodeSelectAction.Expand; //设置点击节点为展开
            ChildDocFolder(spfolder, node);  //递归添加文件夹
        }
    }
}

protected void btnNewFolder_Click(object sender, EventArgs e)
{
    string folderText = txtNewFolder.Text;
    //在指定文件夹下新增一个文件夹；
    Guid folderGuid = Guid.Parse(trvwLibConstruct.SelectedNode.Value);
    SPList list = SPContext.Current.Web.Lists[Request.QueryString["listName"]];
    //SPDocumentLibrary list = SPContext.Current.Web.Lists[Request.QueryString["listName"]] as SPDocumentLibrary;

    //在指定文件夹下新建一个文件夹。最高一级文件夹如BBSMovie无法这样取得，替代方案可以是SPContext.Current.Web.GetFolders(Guid)或者是分情况
    //SPFolder parentFolder = list.GetItemByUniqueId(folderGuid).Folder;
    SPFolder parentFolder = list.RootFolder;
    if (folderGuid != list.RootFolder.UniqueId)
    {
        parentFolder = list.GetItemByUniqueId(folderGuid).Folder;
    }
    //允许创建文件夹。
    list.EnableFolderCreation = true;
    foreach (SPFolder subFolder in parentFolder.SubFolders)
    {
        if (txtNewFolder.Text==subFolder.Name)
        {
            Response.Write("<script language='javascript'>alert('已有相同名称的文件夹存在');</script>");
            return;
        }
    }
    //在指定文件夹下新建一个类型为文件夹名字为 txtNewFolder.Text的文件夹
    SPListItem item = list.AddItem(parentFolder.ServerRelativeUrl, SPFileSystemObjectType.Folder, txtNewFolder.Text);
    //item["Title"] = txtNewFolder.Text;
    item.Update();
    list.Update();

   //在导航树上添加新建的文件夹节点
   TreeNode node = new TreeNode(txtNewFolder.Text, item.UniqueId.ToString());
    trvwLibConstruct.SelectedNode.ChildNodes.Add(node);
}

效果图：