在 TreeView 中查看的订单列表

Question

我想编写一个应用程序来按主机名的顺序解析树视图中的短链接，例如：

Input:
bit.ly/sh125ad
adf.ly/sh1d5ad
bit.ly/sh1d5ad
adf.ly/sh125ad
adf.ly/sh12had

Output:
adf.ly
    adf.ly/sh1d5ad
    adf.ly/sh125ad
    adf.ly/sh12had
bit.ly
    bit.ly/sh125ad
    bit.ly/sh1d5ad

在我写完解析部分之后：

List<string> links = linkField.Text.Split('\n').ToList();

我不知道如何在treeView.Nodes 中添加父节点，然后添加子节点。 我的尝试是：

foreach (string link in links)
{
    Uri url = new Uri(link);
    if (!treeView.Nodes.Contains(new TreeNode(url.Host)))
         treeView.Nodes.Add(new TreeNode(url.Host));
}

但如果我想添加链接，我找不到第一个 TreeNode，因为它的子节点

Answer 1

这有点混乱，但它很快就可以满足您的需求。首先创建一个类来保存每个 uniqe 域及其 URL：

public class ShortLink
{
    public string DomainName { get; set; }
    public List<string> UrlList;

    public ShortLink(string domainName)
    {
        DomainName = domainName;
        UrlList = new List<string>();
    }

    public void AddUrl(string url)
    {
        if(!UrlList.Contains(url))
            UrlList.Add(url);
    }

    public string GetFullUrl(int indexOfUrlInList)
    {
        return DomainName + "/" + UrlList[indexOfUrlInList];
    }

    //Add other methods like remove and stuff
}

假设你的表单有一个名为treeView1的treview，那么试试下面的代码：

public partial class Form1 : Form
{
    private List<string> _links = new List<string>(new []{
        "bit.ly/sh125ad",
        "adf.ly/sh1d5ad",
        "bit.ly/sh1d5ad",
        "adf.ly/sh125ad",
        "adf.ly/sh12had"
    });

    private List<ShortLink> _shortLinks = new List<ShortLink>();

    public Form1()
    {
        InitializeComponent();

        PopulateTreeView();
    }

    private void PopulateTreeView()
    {
        //Make the dictionary
        foreach (var link in _links)
        {
            var parts = link.Split('/');
            var domainPart = parts[0];

            if (!_shortLinks.Contains(_shortLinks.FirstOrDefault(x => x.DomainName == domainPart)))
            {
                var shortLink = new ShortLink(domainPart);
                _shortLinks.Add(shortLink);
            }
        }

        foreach (var link in _links)
        {
            var parts = link.Split('/');
            var domainPart = parts[0];
            var urlPart = parts[1];
            //find a ShortLink in the list we made that matches this domainpart
            var shortLink = _shortLinks.FirstOrDefault(x => x.DomainName == domainPart);

            //if its not null, we add the url part to taht!
            if(shortLink != null)
                shortLink.AddUrl(urlPart);

            //now we have all domains and parts
        }


        //Populate treeview
        foreach (var shortLink in _shortLinks)
        {
            var parentNode = new TreeNode(shortLink.DomainName);
            var childNodes = new List<TreeNode>();

            //add all the links in the current shortLink to the list of treenodes
            foreach (var link in shortLink.UrlList)
            {
                childNodes.Add(new TreeNode(link));
            }

            //now time to add child notes to parent node
            parentNode.Nodes.AddRange(childNodes.ToArray());

            treeView1.Nodes.Add(parentNode);
        }
    }
}

更新

我刚刚意识到您的问题实际上是关于查找父节点。请看下面的方法：

private void AddToTreeView(string domain, string link)
{
    foreach (TreeNode node in treeView1.Nodes)
    {
        if (node.Text == domain)
        {
            node.Nodes.Add(link);
        }
    }
}

当然，您可以在 foreach 循环中创建 Node 时创建完整的节点详细信息。您可以为每个节点设置Name和Tag等字段以供进一步使用！

您还可以将TreeNode 子类化并为其添加自己的自定义字段。