Winform TreeView 节点CheckBox选中，取消

　　 private void treeView1_MouseClick(object sender, MouseEventArgs e)
{
TreeNode node = treeView1.GetNodeAt(new Point(e.X, e.Y));
if (node != null)
{
ChangeChild(node, node.Checked);//影响子节点
ChangeParent(node);//影响父节点
}
}

//递归子节点跟随其全选或全不选
private void ChangeChild(TreeNode node, bool state)
{
node.Checked = state;
foreach (TreeNode tn in node.Nodes)
ChangeChild(tn, state);
}

//递归父节点跟随其全选或全不选
private void ChangeParent(TreeNode node)
{
if (node.Parent != null)
{
//兄弟节点被选中的个数
int brotherNodeCheckedCount = 0;
//遍历该节点的兄弟节点
foreach (TreeNode tn in node.Parent.Nodes)
{
if (tn.Checked == true)
brotherNodeCheckedCount++;
}
//兄弟节点全没选，其父节点也不选
if (brotherNodeCheckedCount == 0)
{
node.Parent.Checked = false;
ChangeParent(node.Parent);
}
//兄弟节点只要有一个被选，其父节点也被选
if (brotherNodeCheckedCount >= 1)
{
node.Parent.Checked = true;
ChangeParent(node.Parent);
}
}
}