asp.net获取TreeView中第一个选中的节点

privateTreeNodeGetSelectedGroup(TreeViewtv)
{
foreach(TreeNodeitemintv.Nodes)
{
if(item.Checked)
{
returnitem;
}
else
{
returnGetSelectedChildGroup(item);
}
}
returnnull;

}

TreeNoderesult=null;
privateTreeNodeGetSelectedChildGroup(TreeNodetreeNode)
{
foreach(TreeNodeitemintreeNode.ChildNodes)
{
if(item.Checked)
{
returnitem;
}
else
{
result=GetSelectedChildGroup(item);
}
}
returnresult;
}