Question

我在我的Windows应用程序中有树视图，在树视图中有复选框，我有一些＆＃34;父节点＆＃34;和一些儿童节点＆＃34;并且我想一次点击＆＃34;全部检查＆＃34;检查并取消检查父节点和子节点。和＆＃34;取消选中所有＆＃34;按钮......我该怎么做？

现在，如果我单击特定的父节点以及子文件夹，它应该在列表视图中显示它！

在这里输入代码

namespace howto_treeview_select_subtree
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            trvMeals.CheckBoxes = true;
            foreach (TreeNode node in trvMeals.Nodes)
            {
                ExpandNode(node);
            }


            trvMeals.SelectedNode = trvMeals.Nodes[0];
            foreach (TreeNode node in trvMeals.Nodes)
            {
                node.Checked = true;
            }
        }
        private void ExpandNode(TreeNode node)
        {
            node.EnsureVisible();
            foreach (TreeNode child in node.Nodes)
            {
                ExpandNode(child);
            }
        }


        private void trvMeals_AfterCheck(object sender, TreeViewEventArgs e)
        {
            TreeNode node = e.Node;
            bool is_checked = node.Checked;
            foreach (TreeNode child in node.Nodes)
            {
                child.Checked = is_checked;
            }
            trvMeals.SelectedNode = node;
        }

        private void trvMeals_AfterSelect(object sender, TreeViewEventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            foreach (TreeNode node in trvMeals.Nodes)
            {
                node.Checked = true;
                CheckChildren(node, true);
            }
            //foreach (TreeNode node in trvMeals.Nodes)
            //{
            //    node.Checked = true;

            //}
        }

        private void button2_Click(object sender, EventArgs e)
        {

            foreach (TreeNode node in trvMeals.Nodes)
            {
                node.Checked = false;

            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
           listView1.Text = (listView1 + "\n") + trvMeals.SelectedNode.Text;
            //foreach (TreeNode node in trvMeals.Nodes)
            //{
            //    RcTxt.Text = RcTxt.Text + trvMeals.SelectedNode.Text;
            //}
        }

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

        private void button4_Click(object sender, EventArgs e)
        {
            listView1.Clear();
        }
    }
}

Answer 1

执行此操作的一种方法是，您可以为AfterSelect的{{1}}事件创建事件处理程序。

像这样的东西

TreeView

要执行检查和取消选中，请为private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { //grab the listView object and sender as TreeView. //grab whatever you need from the TreeView //Put whatever you need in the listView }事件TreeView创建另一个事件处理程序。

AfterCheck

编辑：

扩展代码：

private void treeView1_AfterCheck(object sender, TreeViewEventArgs e) {
    TreeView view = sender as TreeView;         
    //Access the treeview nodes, check/uncheck them
}

我已经扩展了代码，以便您有更好的想法。希望它可能有所帮助。

注意：我没有彻底检查代码，因为它可能需要一段时间，但我相信这应该足以让您获得必要的工具以及基本的想法。

如何在C＃中将TreeView项显示为ListView项

1 个答案: