通過繼承系統的ComboBox，寫一個新控件ComboBoxEx，重寫它的焦點以及文本更新事件，就可以輕松實現拼音首字母檢索了。例如：輸入 gd ，就可以出現“廣東”。

?1using?System;
?2using?System.Collections.Generic;
?3using?System.Text;
?4using?System.Windows.Forms;
?5using?System.Collections;
?6
?7namespace?PrintDoc
?8{
?9????public?class?ComboBoxEx?:?ComboBox
10????{
11????????private?ArrayList?m_list?=?new?ArrayList();
12
13????????protected?override?void?OnEnter(EventArgs?e)
14????????{
15????????????m_list.Clear();
16????????????m_list.AddRange(this.Items);
17????????????base.OnEnter(e);
18????????}
19
20????????protected?override?void?OnLeave(EventArgs?e)
21????????{
22????????????this.Items.Clear();
23????????????this.Items.AddRange(m_list.ToArray());
24????????????base.OnLeave(e);
25????????}
26
27????????protected?override?void?OnTextUpdate(EventArgs?e)
28????????{
29????????????while?(this.Items.Count?>?0)
30????????????{
31????????????????this.Items.RemoveAt(0);
32????????????}
33????????????foreach?(object?o?in?this.m_list)
34????????????{
35????????????????if?(?GetChineseSpell(o.ToString()).ToLower().Contains(this.Text.ToLower()))
36????????????????{
37????????????????????this.Items.Add(o);
38????????????????}
39????????????}
40????????????this.DroppedDown?=?true;
41????????????this.Cursor?=?Cursors.Default;
42????????????base.OnTextUpdate(e);
43????????}
44
45????????static?public?string?GetChineseSpell(string?strText)
46????????{
47????????????int?len?=?strText.Length;
48????????????string?myStr?=?"";
49????????????for?(int?i?=?0;?i?<?len;?i++)
50????????????{
51????????????????myStr?+=?getSpell(strText.Substring(i,?1));
52????????????}
53????????????return?myStr;
54????????}
55
56????????static?public?string?getSpell(string?cnChar)
57????????{
58????????????byte[]?arrCN?=?Encoding.Default.GetBytes(cnChar);
59????????????if?(arrCN.Length?>?1)
60????????????{
61????????????????int?area?=?(short)arrCN[0];
62????????????????int?pos?=?(short)arrCN[1];
63????????????????int?code?=?(area?<<?8)?+?pos;
64????????????????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?};
65????????????????for?(int?i?=?0;?i?<?26;?i++)
66????????????????{
67????????????????????int?max?=?55290;
68????????????????????if?(i?!=?25)?max?=?areacode[i?+?1];
69????????????????????if?(areacode[i]?<=?code?&&?code?<?max)
70????????????????????{
71????????????????????????return?Encoding.Default.GetString(new?byte[]?{?(byte)(65?+?i)?});
72????????????????????}
73????????????????}
74????????????????return?"*";
75????????????}
76????????????else?
77????????????????return?cnChar;
78????????}
79????}
80}
81

?

用來進行語法轉化的工具：http://codeconverter.sharpdevelop.net/SnippetConverter.aspx

轉化之后的VB.NET版本如下。?

?1????Public?Shared?Function?getHzPy()Function?getHzPy(ByVal?cnChar?As?String)?As?String
?2????????Dim?arrCN?As?Byte()?=?System.Text.Encoding.[Default].GetBytes(cnChar)
?3????????If?arrCN.Length?>?1?Then
?4????????????Dim?area?As?Integer?=?CShort(arrCN(0))
?5????????????Dim?pos?As?Integer?=?CShort(arrCN(1))
?6????????????Dim?code?As?Integer?=?(area?<<?8)?+?pos
?7????????????Dim?areacode?As?Integer()?=?{45217,?45253,?45761,?46318,?46826,?47010,?_
?8?????????????47297,?47614,?48119,?48119,?49062,?49324,?_
?9?????????????49896,?50371,?50614,?50622,?50906,?51387,?_
10?????????????51446,?52218,?52698,?52698,?52698,?52980,?_
11?????????????53689,?54481}
12????????????For?i?As?Integer?=?0?To?25
13????????????????Dim?max?As?Integer?=?55290
14????????????????If?i?<>?25?Then
15????????????????????max?=?areacode(i?+?1)
16????????????????End?If
17????????????????If?areacode(i)?<=?code?AndAlso?code?<?max?Then
18????????????????????Return?System.Text.Encoding.[Default].GetString(New?Byte()?{CByte((65?+?i))})
19????????????????End?If
20????????????Next
21????????????Return?"*"
22????????Else
23????????????Return?cnChar
24????????End?If
25????End?Function

?

另外還有一篇相關的文章，除了計算拼音的算法不對之外，其他方面的事件考慮的比較周全。可以用上面的算法替換掉下面文章中的getHzPy方法。

http://blog.csdn.net/Flora_qxy/archive/2007/08/30/1764964.aspx

除此之外，再貼兩篇和AucoCompleteComboBox相關的文章，看似很好很強大。

http://www.codeproject.com/KB/architecture/MultiColumnFlatCombo.aspx

http://www.codeproject.com/KB/combobox/akautocomplete.aspx

轉載于:https://www.cnblogs.com/hejycpu/archive/2009/03/27/1423192.html

總結

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