模仿windows7添加删除程序的treeview中的checkbox效果（转载）

//TreeView的AfterCheck事件

    private void TvNodeInfo_AfterCheck(object sender, TreeViewEventArgs e)
        {
            CheckControl(e);
        }


  public void CheckControl(TreeViewEventArgs e)
        {
            if (e.Action != TreeViewAction.Unknown)
            {
                if (e.Node != null && !Convert.IsDBNull(e.Node))
                {
                    CheckParentNode(e.Node);
                    if (e.Node.Nodes.Count > 0)
                    {
                        CheckAllChildNodes(e.Node, e.Node.Checked);
                    }
                }
            }
        }



  private void CheckAllChildNodes(TreeNode treeNode, bool p)
        {
            foreach (TreeNode tn in treeNode.Nodes)
            {
                tn.Checked = p;

                if (tn.Nodes.Count > 0)
                {
                    CheckAllChildNodes(tn, p);
                }
            }
        }


   private void CheckParentNode(TreeNode treeNode)
        {
            bool bChecked = false;

            if (treeNode.Parent != null)
            {
                foreach (TreeNode node in treeNode.Parent.Nodes)
                {
                    if (node.Checked)
                    {
                        bChecked = true;
                        break;
                    }
                }

                if (bChecked)
                {
                    treeNode.Parent.Checked = true;
                    CheckParentNode(treeNode.Parent);
                }
                else
                {
                    treeNode.Parent.Checked = false;
                    CheckParentNode(treeNode.Parent);
                }
            }
        }