public static class TreeViewCheck
{
    /// <summary>
    /// 系列节点 Checked 属性控制
    /// </summary>
    /// <param name="e"></param>
    public static 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);
                }
            }
        }
    }

    #region 私有方法

    //改变所有子节点的状态
    private static void CheckAllChildNodes(TreeNode pn, bool IsChecked)
    {
        foreach (TreeNode tn in pn.Nodes)
        {
            tn.Checked = IsChecked;

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

    //改变父节点的选中状态，此处为所有子节点不选中时才取消父节点选中，可以根据需要修改
    private static void CheckParentNode(TreeNode curNode)
    {
        bool bChecked = false;

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

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

    #endregion
}