[转]C#中，让组合框(ComboBox)支持拼音首字母检索筛选

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”。

1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4 using System.Windows.Forms;
5 using System.Collections;
6
7 namespace 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

用来进行语法转化的工具：http://codeconverter.sharpdevelop.net/SnippetConverter.aspx

转化之后的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

另外还有一篇相关的文章，除了计算拼音的算法不对之外，其他方面的事件考虑的比较周全。可以用上面的算法替换掉下面文章中的getHzPy方法。

http://blog.csdn.net/Flora_qxy/archive/2007/08/30/1764964.aspx (VB.NET)

除此之外，再贴两篇和AucoCompleteComboBox相关的文章，看似很好很强大。

http://www.codeproject.com/KB/architecture/MultiColumnFlatCombo.aspx (C++, English)

http://www.codeproject.com/KB/combobox/akautocomplete.aspx (VB.NET , English)

From:

http://www.cnblogs.com/hejycpu/archive/2009/03/27/1423192.html

http://www.cnblogs.com/xiongeee/archive/2009/03/24/485867.html

http://www.cnblogs.com/kwklover/archive/2006/01/12/316308.html  汉字转拼音缩写的函数(C#)