TreeView节点收缩与展开（二）

两个事件都写上，这样无论点图标还是文字，都可以

TreeView1_SelectedNodeChanged

TreeView1_TreeNodeExpanded

其中关键是找TreeNodeCollection

/// <summary>
/// 点击文字展开与收缩
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
TreeView tv = (TreeView)sender;
TreeNode tn = tv.SelectedNode;

TreeNodeCollection tnc = null;
if (tn.Parent == null)
{
tnc = tv.Nodes;
}
else
{
tnc = tn.Parent.ChildNodes;
}

foreach (TreeNode node in tnc)
{
if (node == tn)
{
node.Expanded = true;
}
else
{
node.CollapseAll();
}
}

}

/// <summary>
/// 点击图标展开与收缩
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
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();
}
}
}