TreeView简单的动态加载数据

Posted 2020-10-15

简单的小记录，省得去看控件属性详情了，基本常用的属于就几个

先是判断根节点是否存在控件中，如果不存在则创建，之前要添加了节点同样的方法

把根节点传到子节点的方法中，再判断是否在根节点里存在子节点，如果不存在则创建，

最后利用控件的双击事件获取当前选中的节点的内容。

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Windows.Forms;
  9 using System.Text.RegularExpressions;
 10 using DotNet4.Utilities;
 11 using System.Threading;
 12 
 13 namespace TreeviewDome
 14 {
 15     public partial class Form1 : Form
 16     {
 17         public Form1()
 18         {
 19             InitializeComponent();
 20         }
 21 
 22         private void button1_Click(object sender, EventArgs e)
 23         {
 24             Thread t = new Thread(ThreadProcessUrl);
 25             t.IsBackground = true;
 26             t.Start();
 27         }
 28 
 29         /// <summary>
 30         /// 根据页数生成Url
 31         /// </summary>
 32         private void ThreadProcessUrl()
 33         {
 34             int page = Convert.ToInt32(txtPages.Text);
 35             if (page > 0)
 36             {
 37                 for (int i = 1; i <= page; i++)
 38                 {
 39                     string address = string.Format(txtUrl.Text, i);
 40                     Gethtml(address);
 41                 }
 42             }
 43             else
 44             {
 45                 GetHtml(txtUrl.Text);
 46             }
 47         }
 48 
 49         /// <summary>
 50         /// 批量下载网页处理链接
 51         /// </summary>
 52         /// <param name="urls">传入Url</param>
 53         public void GetHtml(string urls) 
 54         {
 55             HttpHelper http = new HttpHelper();
 56             HttpItem item = new HttpItem();
 57             item.URL = urls;
 58             HttpResult result = http.GetHtml(item);
 59             string html = result.Html;
 60             Regex r = new Regex("(?<=<span class=\\"n-img\\"><a href=\\").*?(?=\\")");
 61             MatchCollection m = r.Matches(html);
 62             if (!tvUrlList.Nodes.ContainsKey(urls)) //判断是否存在节点，不存在则创建
 63             {
 64                 TreeNode root = new TreeNode(urls); //创建根节点
 65                 this.Invoke(new Action(delegate 
 66                     {
 67                         tvUrlList.Nodes.Add(root);
 68                     }));
 69 
 70                 foreach (Match mh in m)
 71                 {
 72                     TreeNode node = new TreeNode(mh.Value);
 73                     if (!root.Nodes.ContainsKey(mh.Value)) //判断根节点是否存在子节点，不存在则创建
 74                     {
 75                         this.Invoke(new Action(delegate 
 76                             {
 77                                 root.Nodes.Add(node); //在根节点下添加子节点
 78                             }));
 79                     }
 80                 }
 81             }
 82             
 83         }
 84 
 85         /// <summary>
 86         /// 双击选中节点处理
 87         /// </summary>
 88         /// <param name="sender"></param>
 89         /// <param name="e"></param>
 90         private void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
 91         {
 92             //获取被单击的节点
 93             TreeNode tn = e.Node;
 94             string ss=tvUrlList.TopNode.Text;
 95             if (tn.Text ==ss)
 96             {
 97                 MessageBox.Show("这个是不想要的");
 98             }
 99             else 
100             {
101                 MessageBox.Show("当前选中的是:"+tn.Text);    
102             }
103         }
104     }
105 }

下载：https://files.cnblogs.com/files/ncle/TreeviewDome.rar