C#实现中国行政区划数据下载

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private string BaseURL = "http://www.stats.gov.cn/tjsj/tjbz/tjyqhdmhcxhfdm/2018/";

        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            // 从网页的Url链接加载
            var url = BaseURL + "index.html";
            var web = new HtmlWeb();
            web.OverrideEncoding = Encoding.GetEncoding("gb2312");
            var doc = web.Load(url, "get");
            HtmlNodeCollection provinces = doc.DocumentNode.SelectNodes("//tr[@class='provincetr']/td");
            foreach (HtmlNode province in provinces)
            {
                TreeNode node = new TreeNode();
                node.Tag = province.InnerText.Trim();
                node.Name = province.FirstChild.Attributes["href"].Value.Trim().Split('.')[0];
                node.Text = "[" + node.Name + "]" + node.Tag;
                areaTreeView.Nodes["0"].Nodes.Add(node);
            }
            areaTreeView.Nodes["0"].Expand();
        }

        private void areaTreeView_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            loadChild(this.areaTreeView.SelectedNode);
        }

        /// <summary>
        /// 加载地市
        /// </summary>
        /// <param name="parentCode"></param>
        private void loadCity(TreeNode root, string parentCode)
        {
            //citytr
            var url = BaseURL + parentCode + ".html";
            var web = new HtmlWeb();
            web.OverrideEncoding = Encoding.GetEncoding("gb2312");
            var doc = web.Load(url, "get");
            HtmlNodeCollection citys = doc.DocumentNode.SelectNodes("//tr[@class='citytr']");
            if (citys != null)
            {
                foreach (HtmlNode city in citys)
                {
                    TreeNode node = new TreeNode();
                    HtmlNode code = city.FirstChild;

                    node.Tag = code.NextSibling.InnerText.Trim();
                    node.Name = code.InnerText.Trim().Substring(0,4);
                    node.Text = "[" + node.Name + "]" + node.Tag;
                    root.Nodes.Add(node);
                }
                root.Expand();
            }
        }
        /// <summary>
        /// 加载区县
        /// </summary>
        /// <param name="parentCode"></param>
        private void loadCounty(TreeNode root, string parentCode)
        {
            //countytr
            var url = BaseURL + parentCode.Substring(0, 2) + "/" + parentCode + ".html";
            var web = new HtmlWeb();
            web.OverrideEncoding = Encoding.GetEncoding("gb2312");
            var doc = web.Load(url, "get");
            HtmlNodeCollection citys = doc.DocumentNode.SelectNodes("//tr[@class='countytr']");
            if (citys != null)
            {
                foreach (HtmlNode city in citys)
                {
                    TreeNode node = new TreeNode();
                    HtmlNode code = city.FirstChild;

                    node.Tag = code.NextSibling.InnerText.Trim();
                    node.Name = code.InnerText.Trim().Substring(0,6);
                    node.Text = "[" + node.Name + "]" + node.Tag;
                    root.Nodes.Add(node);
                }
                root.Expand();
            }
        }

        /// <summary>
        /// 加载乡镇
        /// </summary>
        /// <param name="parentCode"></param>
        private void loadTown(TreeNode root,string parentCode)
        {
            //towntr
            var url = BaseURL + parentCode.Substring(0, 2) + "/" + parentCode.Substring(2, 2) + "/" + parentCode + ".html";
            var web = new HtmlWeb();
            web.OverrideEncoding = Encoding.GetEncoding("gb2312");
            var doc = web.Load(url, "get");
            HtmlNodeCollection citys = doc.DocumentNode.SelectNodes("//tr[@class='towntr']");
            if (citys != null)
            {
                foreach (HtmlNode city in citys)
                {
                    TreeNode node = new TreeNode();
                    HtmlNode code = city.FirstChild;

                    node.Tag = code.NextSibling.InnerText.Trim();
                    node.Name = code.InnerText.Trim().Substring(0, 9);
                    node.Text = "[" + node.Name + "]" + node.Tag;
                    root.Nodes.Add(node);
                }
                root.Expand();
            }
        }

        private void loadChild(TreeNode root)
        {
            string parentCode = root.Name;
            if (root.Level == 1)
            {
                this.loadCity(root,parentCode);
            }
            else if (root.Level == 2)
            {
                this.loadCounty(root, parentCode);
            }
            else if (root.Level == 3)
            {
                this.loadTown(root, parentCode);
            }
        }

        private void btnDownloadSelect_Click(object sender, EventArgs e)
        {
            TreeNode root = this.areaTreeView.SelectedNode;
            if (root == null)
            {
                MessageBox.Show("请选择节点", "提示", MessageBoxButtons.OK);
                return;
            }
            loadAllChild(root);
            string result1 = root.Text+@".txt";//结果保存到桌面
            FileStream fs = new FileStream(result1, FileMode.Append);
            StreamWriter wr = null;
            wr = new StreamWriter(fs);
            exportNode(root, wr);
            wr.Close();
        }

        private void loadAllChild(TreeNode root)
        {
            if (root.Nodes.Count <= 0)
            {
                loadChild(root);
            }
            foreach (TreeNode node in root.Nodes)
            {
                loadAllChild(node);
            }
        }

        private void exportNode(TreeNode root, StreamWriter wr)
        {
            wr.WriteLine(root.Name + " " + root.Tag);
            foreach (TreeNode node in root.Nodes)
            {
                exportNode(node,wr);
            }
        }

来源：oschina

链接：https://my.oschina.net/linx/blog/3143797