treeveiw 折叠/展开设置

[lookauto]

treeview在页面中我默认设置是折叠的（root.Expanded = false;） 但是我现在想单击其中一个根节点让它触发事件同时展开这个根节点！
可是我每次单击一个根节点之后还是折叠着的 怎么才能做出我想要的结果？

[vlysses]

给要展开的节点设置OnTreeNodePopulate="OnPopulate",在OnPopulate事件中写增加node的代码；如treenode tn=new treenode();
tn.Text="";
tn.Value="";
treeview1.Node.Add(tn);

[Jn_dream2008_wht]

/// <summary>
/// 显示用户菜单
/// </summary>
/// <param name="userId"></param>
protected void DisplayUserMenu(string userId)
{
this.TreeView1.Nodes.Clear();
List<Right> userList = RightManager.getMenuByAttribute(0);
for (int i = 0; i < userList.Count; i++)
{
Right right = userList[i];
TreeNode fatherNode = CreateTreeNode(right.Text, Convert.ToString(right.Id), "~/images/menuclose.gif");
CreateChildTree(right.Id, userId, fatherNode);
List<int> expandNodeId = ViewState["expandNodeId"] as List<int>;

this.TreeView1.Nodes.Add(fatherNode);


}

}

/// <summary>
/// 创建根节点
/// </summary>
/// <param name="strText"></param>
/// <param name="strId"></param>
/// <param name="strImage"></param>
/// <returns></returns>
private TreeNode CreateTreeNode(string strText, string strId, string strImage)
{
TreeNode newNode = new TreeNode();
newNode.Text = strText;
newNode.Value = strId;
newNode.ImageUrl = strImage;
return newNode;
}
/// <summary>
/// 创建子节点
/// </summary>
/// <param name="nodeId"></param>
/// <param name="userId"></param>
/// <param name="fatherNode"></param>
private void CreateChildTree(int nodeId, string userId, TreeNode fatherNode)
{
List<Right> rightList = RightManager.getMenuByAttribute(nodeId);
for (int i = 0; i < rightList.Count; i++)
{
Right right = rightList[i];
TreeNode childNode = CreateTreeNode(right.Text , Convert.ToString(right.Id), "~/images/closeTree.gif");
childNode.NavigateUrl = "";
fatherNode.ChildNodes.Add(childNode);

}
}

这是一个动态添加TreeView的源码

[lookauto]

拜托请下次回复别人的问题先看看清楚好吧！ 谁要动态添加TreeView的东西 ！！

[xiaofangyanan]

this.TreeView1.SelectedNode.Expanded = true