.NET树形控件展开一个节点则关闭同级节点

前台代码:

<asp:TreeView ID="TreeView1" runat="server" ExpandDepth="0" OnTreeNodeExpanded="TreeView1_TreeNodeExpanded" ShowLines="True">

关键是:OnTreeNodeExpanded="TreeView1_TreeNodeExpanded"

后台代码:

protected void TreeView1_TreeNodeExpanded(object sender, TreeNodeEventArgs e)

{

TreeNodeCollection ts = null;

if (e.Node.Parent == null)

{

ts = ((TreeView)sender).Nodes;

}

else

ts = e.Node.Parent.ChildNodes;

foreach (TreeNode node in ts)

{

if (node != e.Node)

{

node.Collapse();

}

}

}