如何在ASP.NET中页面回发后保持treenode扩展 [英] How to keep treenode expanded after page postback in ASP.NET

问题描述

我有一个从DB绑定的树视图，假设我选择第二个节点并在其上创建一些操作，之后我正在进行页面回发并且我选择的节点自动折叠，我需要在页面回发后保持选定的节点扩展。



请帮帮我。



我尝试了什么：



我试过： -

protected void TreeView1_SelectedNodeChanged（object sender，EventArgs e）

{

ViewState [NodeValue] = TreeView1.SelectedNode.Value;

}



和按钮点击事件

protected void btnUploadFile_Click（object sender，EventArgs e）

{

TreeView1.SelectedNode.Value = ViewState [NodeValue]。ToString（）;

TreeView1.SelectedNode.PopulateOnDemand = true;

TreeView1.SelectedNode.Expanded = true;

}



这里我试图使用viewstate获取选定的节点值但仍无法正常工作..

i have a treeview which is binded from DB, suppose i select second node and create some operation on it, after that i am doing page postback and my selected node automatically get collapsed, i need to keep selected node expanded after page postback.

Please help me.

What I have tried:

I tried :-
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
ViewState["NodeValue"] = TreeView1.SelectedNode.Value;
}

And on button click event
protected void btnUploadFile_Click(object sender, EventArgs e)
{
TreeView1.SelectedNode.Value=ViewState["NodeValue"].ToString();
TreeView1.SelectedNode.PopulateOnDemand = true;
TreeView1.SelectedNode.Expanded = true;
}

here i tried to get selected node value using viewstate but still not working..

推荐答案

你好

这是我在我的项目中使用的

Hello
This is what I have used in my Project

TreeListViewState.TreeListViewState _TreeListViewState = new TreeListViewState.TreeListViewState(ProductGroupTreeList);

_TreeListViewState.SaveState();

ProductGroupTreeList.DataSource = ...

_TreeListViewState.LoadState();

希望它有效。

最好的问候

hope it works.
best regards

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