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private void tviewQuickSort_MouseClick(object sender, MouseEventArgs e)
        {
            //获取单击的节点
            TreeNode root = tviewQuickSort.GetNodeAt(new Point(e.X, e.Y));
             //该节点是否被选中
            bool isChecked = root.Checked;

           if (root != null)
           {
               //该节点的选中状态影响其子孙节点的状态
               FooChild(root, isChecked);
              //该节点的选中状态影响其父祖节点的状态
              FooParent(root);
          }

        }

       
        private void FooChild(TreeNode node, bool isChecked)
        {
            node.Checked = isChecked;
            foreach (TreeNode nd in node.Nodes)
            FooChild(nd, isChecked);
        }

       
        private void FooParent(TreeNode root)
        {
          if (root.Parent != null)
             {
                 //兄弟节点被选的个数
                 int brotherNodeCheckedCount = 0;
              //遍历该节点的兄弟节点
                 foreach (TreeNode node in root.Parent.Nodes)
                 {                    
                     if (node.Checked == true)
                         brotherNodeCheckedCount += 1;
                 }
                 //兄弟节点全没选
                 if (brotherNodeCheckedCount == 0)
                 {
                     TreeNode parentNode = root.Parent;
                     parentNode.Checked = false;//其父节点也不选
                     FooParent(parentNode);
                 }
                 //兄弟节点中只要有一个被选
                 if (brotherNodeCheckedCount == 1)
                 {
                     TreeNode parentNode = root.Parent;
                     parentNode.Checked = true;
                     FooParent(parentNode);//其父节点也被选
                 }
             }
         }