拼音筛选的实现

来源：互联网发布：霸王别姬张国荣知乎编辑：程序博客网时间：2024/04/25 12:54

通过继承系统的ComboBox，写一个新控件ComboBoxEx，重写它的焦点以及文本更新事件，就可以轻松实现拼音首字母检索了。

例如：输入 gd ，就可以出现“广东”。

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Collections;

namespace PrintDoc
{
    public class ComboBoxEx : ComboBox
    {
        private ArrayList m_list = new ArrayList();

        protected override void OnEnter(EventArgs e)
        {
            m_list.Clear();
            m_list.AddRange(this.Items);
            base.OnEnter(e);
        }

        protected override void OnLeave(EventArgs e)
        {
            this.Items.Clear();
            this.Items.AddRange(m_list.ToArray());
            base.OnLeave(e);
        }

        protected override void OnTextUpdate(EventArgs e)
        {
            while (this.Items.Count > 0)
            {
                this.Items.RemoveAt(0);
            }
            foreach (object o in this.m_list)
            {
                if ( GetChineseSpell(o.ToString()).ToLower().Contains(this.Text.ToLower()))
                {
                    this.Items.Add(o);
                }
            }
            this.DroppedDown = true;
            this.Cursor = Cursors.Default;
            base.OnTextUpdate(e);
        }

        static public string GetChineseSpell(string strText)
        {
            int len = strText.Length;
            string myStr = "";
            for (int i = 0; i < len; i++)
            {
                myStr += getSpell(strText.Substring(i, 1));
            }
            return myStr;
        }

        static public string getSpell(string cnChar)
        {
            byte[] arrCN = Encoding.Default.GetBytes(cnChar);
            if (arrCN.Length > 1)
            {
                int area = (short)arrCN[0];
                int pos = (short)arrCN[1];
                int code = (area << 8) + pos;
                int[] areacode = { 45217, 45253, 45761, 46318, 46826, 47010, 47297, 47614, 48119, 48119, 49062, 49324, 49896, 50371, 50614, 50622, 50906, 51387, 51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481 };
                for (int i = 0; i < 26; i++)
                {
                    int max = 55290;
                    if (i != 25) max = areacode[i + 1];
                    if (areacode[i] <= code && code < max)
                    {
                        return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
                    }
                }
                return "*";
            }
            else
                return cnChar;
        }
    }
}

http://www.cnblogs.com/feilong3540717/archive/2011/03/14/1984129.html