asp.net 获取TreeView中第一个选中的节点

private treenode getselectedgroup(treeview tv)
{
foreach (treenode item in tv.nodes)
{
if (item.checked)
{
return item;
}
else
{
return getselectedchildgroup(item);
}
}
return null;

}

treenode result = null;
private treenode getselectedchildgroup(treenode treenode)
{
foreach (treenode item in treenode.childnodes)
{
if (item.checked)
{
return item;
}
else
{
result = getselectedchildgroup(item);
}
}
return result;
}