combobox 中文首字母检索功能

来源：互联网发布：知豆电动汽车电池质保编辑：程序博客网时间：2024/06/18 18:01
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows.Forms;using System.Collections;namespace PYFilter{    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;        }    }}
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