C# TreeView搜索功能实现

private void Form1_Load(object sender, EventArgs e)
{
    // 初始化TreeView控件，添加节点及其子节点
    TreeNode root = new TreeNode("Root");
    root.Nodes.Add(new TreeNode("Node1") { Tag = "search" });
    root.Nodes.Add(new TreeNode("Node2") { Tag = "functionality" });
    root.Nodes.Add(new TreeNode("Node3") { Tag = "implementation" });

    treeView1.Nodes.Add(root);
}

private void textBox1_TextChanged(object sender, EventArgs e)
{
    string searchText = textBox1.Text.ToLower();

    // 遍历TreeView控件的所有节点进行匹配
    foreach (TreeNode node in treeView1.Nodes)
    {
        SearchNode(node, searchText);
    }
}

private void SearchNode(TreeNode node, string searchText)
{
    // 根据节点的Tag属性与搜索框的文本进行匹配
    if (node.Tag != null && node.Tag.ToString().ToLower().Contains(searchText))
    {
        node.ForeColor = Color.Black;   // 显示匹配成功的节点
    }
    else
    {
        node.ForeColor = Color.LightGray;   // 隐藏匹配不成功的节点
    }

    // 递归搜索子节点
    foreach (TreeNode childNode in node.Nodes)
    {
        SearchNode(childNode, searchText);
    }
}