TreeView的checked事件

最新推荐文章于 2023-04-27 15:59:04 发布

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最新推荐文章于 2023-04-27 15:59:04 发布

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本文介绍了一个处理 TreeView 控件中节点检查状态同步的方法。通过递归地更新所有子节点和父节点的状态，确保树状结构的一致性。文章详细展示了如何使用 C# 实现这一功能。

    /// <summary>
        /// TreeView checked事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tvMenu_AfterCheck(object sender, TreeViewEventArgs e)
        {
            CheckAll(e.Node);
        }

        /// <summary>
        /// 全部节点check处理
        /// </summary>
        /// <param name="eTreeNode"></param>
        private void CheckAll(TreeNode eTreeNode)
        {
            tvMenu.AfterCheck -=new TreeViewEventHandler(tvMenu_AfterCheck);
            if (eTreeNode.Parent != null)
            {
                CheckParent(eTreeNode);
            }
            if (eTreeNode.Nodes.Count > 0)
            {
                foreach (TreeNode mTN in eTreeNode.Nodes)
                {
                    mTN.Checked = eTreeNode.Checked;

                    foreach (TreeNode mTNSub in mTN.Nodes)
                    {
                        mTNSub.Checked = mTN.Checked;
                        CheckSub(mTNSub);
                    }
                }
            }

            tvMenu.AfterCheck += new TreeViewEventHandler(tvMenu_AfterCheck);
        }
        /// <summary>
        /// 父节点处理
        /// </summary>
        /// <param name="eTreeNode"></param>
        private void CheckParent(TreeNode eTreeNode)
        {
            if (eTreeNode.Parent == null)
            {
                return;
            }

            eTreeNode.Parent.Checked = eTreeNode.Checked;

            foreach (TreeNode mTN in eTreeNode.Parent.Nodes)
            {
                eTreeNode.Parent.Checked = (eTreeNode.Parent.Checked || mTN.Checked);
                if (mTN.Parent != null)
                {
                    CheckParent(mTN.Parent);
                }
            }
        }
        /// <summary>
        /// 子节点处理
        /// </summary>
        /// <param name="eTreeNode"></param>
        private void CheckSub(TreeNode eTreeNode)
        {
            foreach (TreeNode mTN in eTreeNode.Nodes)
            {
                mTN.Checked = eTreeNode.Checked;
                CheckSub(mTN);
            }
        }