僅在擴展節點時加載樹節點

我有一個asp.net樹視圖控件，它在加載頁面時加載樹數據。代碼如下：僅在擴展節點時加載樹節點

protected void Page_Load(object sender, EventArgs e) 
     { 
      if (!IsPostBack) 
      { 
       DocEng.TreeProvider cmsTree = new DocEng.TreeProvider(MembershipContext.AuthenticatedUser); 
       var node = cmsTree.SelectSingleNode(SiteContext.CurrentSiteName, "/", "en-US"); 
       DocEng.TreeNodeCollection myChildren = node.AllChildren; 
       IEnumerable<DocEng.TreeNode> TreeNodes = myChildren.AsEnumerable<DocEng.TreeNode>(); 
       foreach (var tree in TreeNodes.Where(x => x.NodeLevel == 0)) 
       { 
        System.Web.UI.WebControls.TreeNode ParenTreeNode = new System.Web.UI.WebControls.TreeNode(); 
        ParenTreeNode.Text = tree.NodeID.ToString() + ". " + SiteContext.CurrentSiteName; 
        ParenTreeNode.Value = tree.NodeID.ToString(); 
        AddNodes(ParenTreeNode); 
        tvContentTree.Nodes.Add(ParenTreeNode); 
       } 
      } 
     } 


    /// <summary> 
     /// Adding child for the parent 
     /// </summary> 
     /// <param name="TreeNode"></param> 
     private void AddNodes(System.Web.UI.WebControls.TreeNode TreeNode) 
     { 
      DocEng.TreeProvider cmsTree = new DocEng.TreeProvider(MembershipContext.AuthenticatedUser); 
      var node = cmsTree.SelectSingleNode(SiteContext.CurrentSiteName, "/", "en-US"); 
      DocEng.TreeNodeCollection myChildren = node.AllChildren; 
      IEnumerable<DocEng.TreeNode> childTreeNodes = myChildren.AsEnumerable<DocEng.TreeNode>(); 
      foreach (var childTree in childTreeNodes.Where(x => x.NodeParentID == Convert.ToInt32(TreeNode.Value))) 
      { 
       System.Web.UI.WebControls.TreeNode ChildNode = new System.Web.UI.WebControls.TreeNode(); 
       ChildNode.Text = childTree.NodeID.ToString() + ". " + childTree.DocumentName.ToString(); 
       ChildNode.Value = childTree.NodeID.ToString(); 
       TreeNode.ChildNodes.Add(ChildNode); 
       AddNodes(ChildNode); 
       if (childTree.NodeLevel == 1) 
        ChildNode.Collapse(); 
      } 
     }

我需要重寫這段代碼，當我們展開節點只加載數據。而且，當我們擴展時，數據只應填充到被點擊的節點及其子節點直到結束。

來源

2017-06-05 SmartestVEGA

不知道這裏的問題是...你有沒有試圖自己重寫代碼？您必須使用['TreeNodeExpanded']（https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.treeview.treenodeexpanded（v = vs.110）.aspx）事件。您可以通過查看CMS \ CMSModules \ Content \ Controls \ ContentTree.ascx控件獲得一些靈感。 – rocky

嘗試僅在頁面加載和foreach節點上添加一個空節點，以使其可擴展。

然後展開後刪除此子節點並將其填充正常的孩子。

來源

2017-06-05 12:15:30

僅在擴展節點時加載樹節點

回答

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