用WCF服务来动态的获取本地XML省市区文档

建立一个WCF服务。

 using ClassLibrary;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.ServiceModel;
 using System.ServiceModel.Web;
 using System.Text;
 using System.Xml;

 namespace AreaService
 {
     // 注意: 使用“重构”菜单上的“重命名”命令，可以同时更改代码、svc 和配置文件中的类名“Service1”。
     // 注意: 为了启动 WCF 测试客户端以测试此服务，请在解决方案资源管理器中选择 Service1.svc 或 Service1.svc.cs，然后开始调试。
     public class Service1 : IService1
     {
         public static class api
         {
             public static XmlDocument cacheAreaDocument { get; set; }
             public static XmlDocument cacheUrlMapDocument { get; set; }
         }
         public List<ClassLibrary.Area> GetProvince()
         {
             XmlDocument xd = api.cacheAreaDocument;
             if (xd == null)
             {
                 xd = new XmlDocument();
                 xd.Load(AppDomain.CurrentDomain.BaseDirectory + "/data/ChinaArea.xml");
             }
             XmlNode xn = xd.SelectSingleNode("area");
             List<Area> areas = new List<Area>();
             //等效于 XmlNode xn = xd.DocumentElement;
             foreach (XmlNode province in xn.ChildNodes)
             {
                 XmlElement proEl = (XmlElement)province;
                 areas.Add(new Area { province = proEl.GetAttribute("province"), provinceID = proEl.GetAttribute("provinceID") });
             }
             return areas;
         }
         public List<ClassLibrary.Area> GetCityByProvinceId(string provinceID)
         {
             XmlDocument xd = api.cacheAreaDocument;
             if (xd == null)
             {
                 xd = new XmlDocument();
                 xd.Load(AppDomain.CurrentDomain.BaseDirectory + "/data/ChinaArea.xml");
             }
             XmlNode xn = xd.SelectSingleNode("area");
             List<ClassLibrary.Area> areas = new List<ClassLibrary.Area>();
             foreach (XmlNode province in xn.ChildNodes)
             {
                 XmlElement pro = (XmlElement)province;
                 if (pro.GetAttribute("provinceID") == provinceID)
                 {
                     foreach (var cityNd in pro.ChildNodes)
                     {
                         XmlElement city = (XmlElement)cityNd;
                         areas.Add(new ClassLibrary.Area { City = city.GetAttribute("City"), CityID = city.GetAttribute("CityID") });
                     }
                 }
             }
             if (xn.ChildNodes == null || xn.ChildNodes.Count <= )
             {
                 areas.Add(new ClassLibrary.Area { City = "", CityID = "" });
             }
             return areas;
         }

         public List<ClassLibrary.Area> GetPieceareaByCityID(string CityID)
         {
             List<Area> areas = new List<Area>();
             if (CityID.Trim() == "")
             {
                 areas.Add(new Area { Piecearea = "", PieceareaID = "" });
                 return areas;
             }
             XmlDocument xd = api.cacheAreaDocument;
             if (xd == null)
             {
                 xd = new XmlDocument();
                 xd.Load(AppDomain.CurrentDomain.BaseDirectory + "/data/ChinaArea.xml");
             }
             XmlNode xn = xd.SelectSingleNode("area");

             //等效于 XmlNode xn = xd.DocumentElement;
             foreach (XmlNode province in xn.ChildNodes)
             {
                 foreach (XmlNode cityNd in province.ChildNodes)
                 {
                     if ((cityNd as XmlElement).GetAttribute("CityID") == CityID)
                     {
                         foreach (var pieceareaNd in cityNd.ChildNodes)
                         {
                             XmlElement piecearea = (XmlElement)pieceareaNd;
                             areas.Add(new Area { Piecearea = piecearea.GetAttribute("Piecearea"), PieceareaID = piecearea.GetAttribute("PieceareaID") });
                         }
                     }

                 }
             }
             return areas;
         }
     }
 }

建立后生成。然后在前端添加服务引用。

实例化。

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace 动态的获取省市
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
             sa = new AreaService.Service1Client();
         }
         AreaService.Service1Client sa;
         private void Form1_Load(object sender, EventArgs e)
         {
             comboBox1.DataSource = sa.GetProvince();
             comboBox1.DisplayMember = "province";
             comboBox1.ValueMember = "provinceID";
             comboBox1_SelectedIndexChanged(sender,e);
             comboBox2_SelectedIndexChanged(sender, e);
             comboBox3_SelectedIndexChanged(sender, e);

         }
         /// <summary>
         /// 获取市
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
         {
             comboBox2.DataSource = sa.GetCityByProvinceId(comboBox1.SelectedValue+"");
             comboBox2.DisplayMember = "City";
             comboBox2.ValueMember = "CityID";
         }

         private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
         {
             comboBox3.DataSource = sa.GetPieceareaByCityID(comboBox2.SelectedValue+"");
             comboBox3.DisplayMember = "Piecearea";
             comboBox3.ValueMember = "PieceareaID";
         }

         private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
         {

         }

         private void button1_Click(object sender, EventArgs e)
         {

         }

     }
 }

这是窗体设计代码：

namespace 动态的获取省市
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.comboBox1 = new System.Windows.Forms.ComboBox();
            this.comboBox2 = new System.Windows.Forms.ComboBox();
            this.comboBox3 = new System.Windows.Forms.ComboBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(40, 50);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(29, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "省：";
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(40, 111);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(29, 12);
            this.label2.TabIndex = 1;
            this.label2.Text = "市：";
            //
            // label3
            //
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(40, 175);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(29, 12);
            this.label3.TabIndex = 2;
            this.label3.Text = "区：";
            //
            // comboBox1
            //
            this.comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.comboBox1.FormattingEnabled = true;
            this.comboBox1.Location = new System.Drawing.Point(87, 47);
            this.comboBox1.Name = "comboBox1";
            this.comboBox1.Size = new System.Drawing.Size(121, 20);
            this.comboBox1.TabIndex = 3;
            this.comboBox1.SelectedIndexChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);
            //
            // comboBox2
            //
            this.comboBox2.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.comboBox2.FormattingEnabled = true;
            this.comboBox2.Location = new System.Drawing.Point(87, 108);
            this.comboBox2.Name = "comboBox2";
            this.comboBox2.Size = new System.Drawing.Size(121, 20);
            this.comboBox2.TabIndex = 4;
            this.comboBox2.SelectedIndexChanged += new System.EventHandler(this.comboBox2_SelectedIndexChanged);
            //
            // comboBox3
            //
            this.comboBox3.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.comboBox3.FormattingEnabled = true;
            this.comboBox3.Location = new System.Drawing.Point(87, 172);
            this.comboBox3.Name = "comboBox3";
            this.comboBox3.Size = new System.Drawing.Size(121, 20);
            this.comboBox3.TabIndex = 5;
            this.comboBox3.SelectedIndexChanged += new System.EventHandler(this.comboBox3_SelectedIndexChanged);
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(87, 226);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 6;
            this.button1.Text = "确  定";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(261, 272);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.comboBox3);
            this.Controls.Add(this.comboBox2);
            this.Controls.Add(this.comboBox1);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.ComboBox comboBox1;
        private System.Windows.Forms.ComboBox comboBox2;
        private System.Windows.Forms.ComboBox comboBox3;
        private System.Windows.Forms.Button button1;
    }
}

效果如下：