Question

我有一个XML文件，格式如下：

<World>
 <Country 1>
  <City 1>
    District 1
    District 2
    District 3
  </City 1>
  <City 2>
    District 1
    District 2
    District 3
  </City 2>
 </Country 1>
 <Country 2>
 ...
 </Country n>
</World>

我需要有4个列表框，以便第一个包含国家/地区名称。第二个城市和第三个区。此外，每当我选择父类别时，应选择与父母相关的所有子类别。也就是说，选择国家一应该显示并选择一个国家（但不是地区）的城市。我还需要更新列表框。同时选择国家1和2应显示国家1和2中的所有城市。

Answer 1

这是您请求的代码（首先需要在页面上放置3个ListBox项目并连接其SelectedValueChange事件）：

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Xml;
using System.Xml.XPath;

namespace MultipleBoundListBox
{
    public partial class Form1 : Form
    {
        private static XmlDocument xmlDoc;
        private static XPathNavigator nav;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            xmlDoc = new XmlDocument();
            xmlDoc.Load("target.xml");

            nav = xmlDoc.DocumentElement.CreateNavigator();

            nav.MoveToFirstChild();
            var countries = new List<string>();
            countries.Add(nav.LocalName);

            while (nav.MoveToNext())
            {
                countries.Add(nav.LocalName);
            }

            listBox1.DataSource = countries;

            BindCities(countries[0]);
        }

        protected void BindCities(string country)
        {
            nav.MoveToRoot();
            var xpath = "/World/" + country;
            var countryElement = nav.SelectSingleNode(xpath);
            countryElement.MoveToFirstChild();

            var cities = new List<string>();
            cities.Add(countryElement.LocalName);

            while (countryElement.MoveToNext())
            {
                cities.Add(countryElement.LocalName);
            }

            listBox2.DataSource = cities;

            BindDistricts(country, cities[0]);
        }

        protected void BindDistricts(string country, string city)
        {
            nav.MoveToRoot();
            var xpath = "/World/" + country + "/" + city;
            var districtElement = nav.SelectSingleNode(xpath);
            districtElement.MoveToFirstChild();

            var districts = new List<string>();
            districts.Add(districtElement.LocalName);

            while (districtElement.MoveToNext())
            {
                districts.Add(districtElement.LocalName);
            }

            listBox3.DataSource = districts;
        }

        private void listBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            BindCities((string)listBox1.SelectedValue);
        }

        private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            BindDistricts((string)listBox1.SelectedValue, (string)listBox2.SelectedValue);
        }
    }
}

XML需要采用以下形式：

<World>
  <Nkvavn>
    <Rcltwkb>
      <Pjwrgsik />
      <Nemscmll />
      <Fnauarnbvw />
      <Egqpcerhjgq />
      <Olyhryyxi />
      <Vvlhtiee />
      <Wlsfhmv />
    </Rcltwkb>
    <Xudbhnakjb>
      <Cwxjtkteuji />
      <Fbtcvf />
      <Uviaceinhl />
    </Xudbhnakjb>
    <Kgujcymilwr>
      <Nlbvgtwoejo />
      <Tvufkvmryybh />
      <Xtomstcenmp />
      <Mhnngf />
      <Fjidqdbafxun />
    </Kgujcymilwr>
    <Taiyiclo>
      <Fiecxoxeste />
      <Loqxjq />
      <Vfsxfilxofe />
      <Hroctladlht />
    </Taiyiclo>
  </Nkvavn>
  <Tfrosh>
    <Tuqomkytlp>
      <Oyvivlvminhn />
      <Qeypvfgul />
      <Mbapjl />
    </Tuqomkytlp>
    <Rvxumtj>
      <Gkvigncdvgy />
      <Okcddyi />
      <Vvmacul />
    </Rvxumtj>
    <Pdjpgexuyc>
      <Yvsdmbckurju />
      <Bvkxvg />
      <Clmrvjwk />
      <Hdafjhydj />
      <Asauxtnoe />
      <Mwcviwmi />
    </Pdjpgexuyc>
  </Tfrosh>
</World>

随意询问您是否有任何问题

C＃使用XML文件的多重绑定列表框/

1 个答案: