TreeView搜索

Question

此函数仅查找树视图中的第一个节点,其中包含SearchText.

private TreeNode SearchNode(string SearchText,TreeNode StartNode)
    {
        TreeNode node=null;
        while (StartNode!= null)
        {
            if (StartNode.Text.ToLower().Contains(SearchText.ToLower()))
            {
                node = StartNode; 
                break;
            };
            if (StartNode.Nodes.Count != 0) 
            {
                node=SearchNode(SearchText, StartNode.Nodes[0]);//Recursive Search
                if (node != null)
                {
                    break;
                };
            };
            StartNode = StartNode.NextNode;
        };
        return node;
    }


    private void button1_Click(object sender, EventArgs e)
    {
        string SearchText = this.textBox1.Text;
        if (SearchText == "")
        {
            return;
        };
        TreeNode SelectedNode = SearchNode(SearchText, treeView1.Nodes[0]);
        if (SelectedNode != null)
        {
            this.treeView1.SelectedNode = SelectedNode;
            this.treeView1.SelectedNode.Expand();
            this.treeView1.Select();
        };
    }

我应该如何更改它,因此该函数不仅能够找到第一个节点,而且还能找到所有这些节点,每次单击button1时,它都会找到下一个节点直到结束,然后从头开始.所以我不应该从TreeView1.Nodes [0]搜索,而是从TreeView1.SelectedNode搜索...

Answer 1

如下所示应该可以添加到您的表单代码中.

    private List<TreeNode> CurrentNodeMatches = new List<TreeNode>();

    private int LastNodeIndex = 0;

    private string LastSearchText;


    private void button1_Click(object sender, EventArgs e)
    {


        string searchText = this.textBox1.Text;
        if (String.IsNullOrEmpty(searchText))
        {
            return;
        };


        if (LastSearchText != searchText)
        {
            //It's a new Search
            CurrentNodeMatches.Clear();
            LastSearchText = searchText;
            LastNodeIndex = 0;
            SearchNodes(searchText, treeView1.Nodes[0]);
        }

        if (LastNodeIndex >= 0 && CurrentNodeMatches.Count > 0 && LastNodeIndex < CurrentNodeMatches.Count)
        {
            TreeNode selectedNode = CurrentNodeMatches[LastNodeIndex];
            LastNodeIndex++;
            this.treeView1.SelectedNode = selectedNode;
            this.treeView1.SelectedNode.Expand();
            this.treeView1.Select();

        }
    } 

    private void SearchNodes(string SearchText, TreeNode StartNode)
    {
        TreeNode node = null;
        while (StartNode != null)
        {
            if (StartNode.Text.ToLower().Contains(SearchText.ToLower()))
            {
                CurrentNodeMatches.Add(StartNode);
            };
            if (StartNode.Nodes.Count != 0)
            {
                SearchNodes(SearchText, StartNode.Nodes[0]);//Recursive Search 
            };
            StartNode = StartNode.NextNode;
        };

    }

这有两个部分;

1. 将所有节点收集到一个 List<TreeNode>

2. List<TreeNode>如果搜索没有改变,则通过页面.如果搜索已更改,请清除列表并重置索引.

我已经使用在.Net 4下运行的Windows Forms测试了它 - 它通过TreeView中的每个节点分页,其中包含搜索文本,1到1,直到它到达最后一个节点.