如何在 C# 中将 TreeView 项显示为 ListView 项

Question

我的 windows 应用程序和带复选框的树视图中有树视图，我有一些 "parent nodes" 和一些 "child nodes"，我想检查和取消检查单击 "Check All" 和 "Uncheck All" 按钮时一次显示父节点和子节点...我应该怎么做？

现在，如果我单击特定的父节点和子文件夹，它应该会显示在列表视图中！

在此处输入代码

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

一种方法是您可以为 TreeView 的 AfterSelect 事件创建事件处理程序。

像这样

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
}

要执行检查和取消检查，为 TreeView 事件 AfterCheck 创建另一个事件处理程序。

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

编辑：

扩展代码：

private void updateChildrenNodes(TreeNode node, bool isChecked) //recursive call
{
    node.Checked = isChecked;
    if (node.Nodes.Count > 0) //has children, do recursive call            
        foreach (TreeNode childNode in node.Nodes)
            updateChildrenNodes(childNode, isChecked);            
}

private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
{
    TreeView view = sender as TreeView;
    TreeNode node = view.SelectedNode;
    bool isChecked = node.Checked;
    updateChildrenNodes(node, isChecked);
}

List<TreeNode> checkedNodes = new List<TreeNode>();
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
    TreeView treeView = sender as TreeView;
    listView1.Clear(); //reset all the nodes
    nodes.Clear(); //clears the list

    //grab whatever you need from the TreeView, check if the TreeNode is checked
    //do the same trick by recursive call to put the checked nodes to checkedNodes list

    foreach (TreeNode checkedNode in checkedNodes)
    {
        //do something, use this info to put in listView1
    }            
}

我已经扩展了代码，以便您有更好的想法。希望它能有所帮助。

注意：我没有彻底检查代码，因为它可能需要一些时间，但我相信这应该足以让您获得必要的工具和基本思想。

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