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   源码介绍

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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;
using System.IO;

namespace Demo
{
    public partial class Demo : Form
    {
        public Demo()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 始发站 文本框 键盘按下松开事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private static TextBox txtStation_Name, txtStation_Value;
        private static ListBox ltb_Stations;
        /// <summary>
        /// 站点文本框 键盘按下松开事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void txtStation_KeyUp(object sender, KeyEventArgs e)
        {
            TextBox eObj = sender as TextBox; //事件源对象
            txtStation_Name = eObj; //当前事件出发对象
            if (eObj.Name == "txtStation_S_Name")
            {
                txtStation_Value = this.txtStation_S_Value; //保存值的textbox
                ltb_Stations = this.lb_Start_Stations;   //始发站 展示数据的
            }
            else
            {
                //到站 控件
                txtStation_Value = this.txtStation_E_Value; //保存值的textbox
                ltb_Stations = this.lb_End_Stations;   //始发站 展示数据的
            }
            //上下左右
            if (e.KeyCode == Keys.Up || e.KeyCode == Keys.Left)
            {
                if (ltb_Stations.SelectedIndex > 0)
                    ltb_Stations.SelectedIndex--;
            }
            else if (e.KeyCode == Keys.Down || e.KeyCode == Keys.Right)
            {
                if (ltb_Stations.SelectedIndex < ltb_Stations.Items.Count - 1)
                    ltb_Stations.SelectedIndex  ;
            }
            //回车
            else if (e.KeyCode == Keys.Enter)
            {
                StationInfo info = ltb_Stations.SelectedItem as StationInfo;
                txtStation_Name.Text = info.StationName_CN;
                txtStation_Value.Text = info.StationValue;
                ltb_Stations.Visible = false;
            }
            else
            {

                if (txtStation_Name.Text != "")
                {
                    IList<StationInfo> dataSource = StationInfo.GetStations(txtStation_Name.Text.Trim());
                    if (dataSource.Count > 0)
                    {
                        ltb_Stations.DataSource = dataSource;
                        ltb_Stations.DisplayMember = "StationName_CN";
                        ltb_Stations.ValueMember = "StationValue";
                        ltb_Stations.Visible = true;
                    }
                    else
                        ltb_Stations.Visible = false;
                }
                else
                {
                    ltb_Stations.Visible = false;
                }
            }
            txtStation_Name.Select(txtStation_Name.Text.Length, 1); //光标定位到文本框最后
        }
        /// <summary>
        /// 展示站点列表的listbox的点击事件，为了给textbox赋值
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ListBox_StationDatas_Click(object sender, EventArgs e)
        {
            ListBox eObj = sender as ListBox;
            StationInfo info = eObj.SelectedItem as StationInfo;
            txtStation_Name.Text = info.StationName_CN;
            txtStation_Value.Text = info.StationValue;
            eObj.Visible = false;
            txtStation_Name.Select(txtStation_Name.Text.Length, 1); //光标定位到最后
        }
        /// <summary>
        /// 展示站点列表的listbox, 鼠标在该控件上移动事件，
        /// 为了鼠标移动选项
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ListBox_StationDatas_MouseMove(object sender, MouseEventArgs e)
        {
            ListBox eObj = sender as ListBox;
            eObj.SelectedIndex = eObj.IndexFromPoint(e.Location);
        }
        /// <summary>
        /// 展示站点列表的listbox, 各项绘制，为了 可以调整 Item的高度
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ListBox_StationDatas_DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();
            e.DrawFocusRectangle();
            StationInfo info = (sender as ListBox).Items[e.Index] as StationInfo;
            e.Graphics.DrawString(info.StationName_CN, e.Font, new SolidBrush(e.ForeColor),
                                    e.Bounds);
        }

        private void txtStation_S_Name_Enter(object sender, EventArgs e)
        {
            lb_Start_Stations.Visible = false;
            lb_End_Stations.Visible = false;
        }
    }
    /// <summary>
    /// 站点信息
    /// </summary>
    public class StationInfo
    {
        /// <summary>
        /// 站点名称 - 中文
        /// </summary>
        public string StationName_CN { get; set; }
        /// <summary>
        /// 站点名称 - 英文
        /// </summary>
        public string StationName_EN { get; set; }
        /// <summary>
        /// 站点名称 - 简写
        /// </summary>
        public string StationName_JX { get; set; }
        /// <summary>
        /// 站点的值
        /// </summary>
        public string StationValue { get; set; }
        /// <summary>
        /// 模糊查询站点
        /// </summary>
        /// <param name="filter"></param>
        /// <returns></returns>
        private static IList<StationInfo> StationData;
        public static IList<StationInfo> GetStations(string filter)
        {
            IList<StationInfo> results = new List<StationInfo>();
            if (StationData == null)
            {
                string stations = GetAllStations();
                string[] datas = stations.Split('@');
                foreach (var item in datas)
                {
                    string[] tempArray = item.Split('|');
                    StationInfo info = new StationInfo()
                    {
                        StationName_CN = tempArray[0],
                        StationValue = tempArray[1],
                        StationName_EN = tempArray[2],
                        StationName_JX = tempArray[3]
                    };
                    results.Add(info);
                }
                StationData = results;
            }
            else
            {
                results = StationData;
            }
            return results.Where(
                f =>
                (f.StationName_CN.Length >= filter.Length && f.StationName_CN.Substring(0, filter.Length) == filter) ||
                (f.StationName_EN.Length >= filter.Length && f.StationName_EN.Substring(0, filter.Length) == filter) ||
                (f.StationName_JX.Length >= filter.Length && f.StationName_JX.Substring(0, filter.Length) == filter) ||
                (f.StationValue.Length >= filter.Length && f.StationValue.Substring(0, filter.Length) == filter)).ToList<StationInfo>();
        }
        /// <summary>
        /// 读取站点数据文件
        /// </summary>
        /// <returns></returns>
        public static string GetAllStations()
        {
            string stationStrs;
            try
            {
                FileStream fileStream = new FileStream(@"Resource\station_data.txt", FileMode.Open);
                StreamReader sr = new StreamReader(fileStream, UnicodeEncoding.GetEncoding("GB2312"));
                stationStrs = sr.ReadToEnd().TrimEnd('@');
                sr.Close();
                fileStream.Close();
                return stationStrs;
            }
            catch (IOException ex)
            {
                return "站点文件读取失败！";
            }
        }
    }
}