树状图更新回发 [英] Tree View Update PostBack

问题描述

我做了一个树状的文件系统，当我单击一个节点时，我可以看到该节点中的文件.

I did a file system like, with a tree view, and when I click on a node I can see the files inside this node.

我现在有问题...单击节点时，我显示文件，但是单击同一节点时，文件消失.

I have a problem now ... When I click on a node I display the files but when I click on this same node , the files disapear .

这是我的代码PageLoad和TreeViewLoad的一部分.

This is a part of my code, PageLoad and also TreeViewLoad .

   protected void Page_Load(object sender, EventArgs e)
    {
        if ((Request.Cookies["UserSettings"] == null))
        {
            Response.Redirect("Logon.aspx");
        }
    }

    #region TreeView

    protected void MyTreeView_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            int userid = Convert.ToInt32(Request.Cookies["UserSettings"]["Id"]);
            DbHelper Db = new DbHelper();

            root = Db.GetFoldersForUser(userid);

            TreeNode rootTreeView = new TreeNode("Projects");
            rootTreeView = LoadNodes(root.TopFolders, rootTreeView);

            MyTreeView.Nodes.Add(rootTreeView);
            MyTreeView.CollapseAll();

        }
    }

    #endregion

我受够了，因为我真的找不到解决方案.！回发是问题吗?如果有人有解决方案，请帮助我.

I'm fed up because I really can't find the solution . Is it a problem of !Postback ? If someone has the solution please help me .

KR

推荐答案

它是因为您正在动态填充树视图.在回发时，您没有实例化它您还可以做些什么.

it because of you are populating the tree view dynamically . and on post back you are not instantiating it what else you can do is.

1)将以上代码放在page_init中.2)按照您的操作方式填充树形视图.

1)put above code in page_init . 2) fill the tree view in the way your doing.

或

删除

    if (!IsPostBack) 

这篇关于树状图更新回发的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！