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”。
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Windows.Forms;
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using System.Collections;
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namespace PrintDoc
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{
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public class ComboBoxEx : ComboBox
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{
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private ArrayList m_list = new ArrayList();
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protected override void OnEnter(EventArgs e)
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{
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m_list.Clear();
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m_list.AddRange(this.Items);
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base.OnEnter(e);
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}
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protected override void OnLeave(EventArgs e)
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{
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this.Items.Clear();
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this.Items.AddRange(m_list.ToArray());
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base.OnLeave(e);
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}
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protected override void OnTextUpdate(EventArgs e)
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{
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while (this.Items.Count > 0)
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{
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this.Items.RemoveAt(0);
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}
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foreach (object o in this.m_list)
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{
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if ( GetChineseSpell(o.ToString()).ToLower().Contains(this.Text.ToLower()))
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{
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this.Items.Add(o);
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}
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}
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this.DroppedDown = true;
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this.Cursor = Cursors.Default;
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base.OnTextUpdate(e);
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}
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static public string GetChineseSpell(string strText)
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{
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int len = strText.Length;
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string myStr = "";
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for (int i = 0; i < len; i++)
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{
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myStr += getSpell(strText.Substring(i, 1));
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}
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return myStr;
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}
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static public string getSpell(string cnChar)
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{
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byte[] arrCN = Encoding.Default.GetBytes(cnChar);
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if (arrCN.Length > 1)
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{
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int area = (short)arrCN[0];
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int pos = (short)arrCN[1];
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int code = (area << 8) + pos;
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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 };
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for (int i = 0; i < 26; i++)
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{
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int max = 55290;
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if (i != 25) max = areacode[i + 1];
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if (areacode[i] <= code && code < max)
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{
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return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
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}
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}
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return "*";
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}
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else
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return cnChar;
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}
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}
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}
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using System;2
using System.Collections.Generic;3
using System.Text;4
using System.Windows.Forms;5
using System.Collections;6

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namespace PrintDoc8
{9
public class ComboBoxEx : ComboBox10
{11
private ArrayList m_list = new ArrayList();12

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protected override void OnEnter(EventArgs e)14
{15
m_list.Clear();16
m_list.AddRange(this.Items);17
base.OnEnter(e);18
}19

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protected override void OnLeave(EventArgs e)21
{22
this.Items.Clear();23
this.Items.AddRange(m_list.ToArray());24
base.OnLeave(e);25
}26

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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

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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

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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。
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Public Shared Function getHzPy(ByVal cnChar As String) As String
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Dim arrCN As Byte() = System.Text.Encoding.[Default].GetBytes(cnChar)
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If arrCN.Length > 1 Then
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Dim area As Integer = CShort(arrCN(0))
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Dim pos As Integer = CShort(arrCN(1))
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Dim code As Integer = (area << 8) + pos
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Dim areacode As Integer() = {45217, 45253, 45761, 46318, 46826, 47010, _
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47297, 47614, 48119, 48119, 49062, 49324, _
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49896, 50371, 50614, 50622, 50906, 51387, _
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51446, 52218, 52698, 52698, 52698, 52980, _
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53689, 54481}
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For i As Integer = 0 To 25
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Dim max As Integer = 55290
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If i <> 25 Then
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max = areacode(i + 1)
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End If
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If areacode(i) <= code AndAlso code < max Then
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Return System.Text.Encoding.[Default].GetString(New Byte() {CByte((65 + i))})
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End If
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Next
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Return "*"
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Else
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Return cnChar
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End If
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End Function
Public Shared Function getHzPy(ByVal cnChar As String) As String2
Dim arrCN As Byte() = System.Text.Encoding.[Default].GetBytes(cnChar)3
If arrCN.Length > 1 Then4
Dim area As Integer = CShort(arrCN(0))5
Dim pos As Integer = CShort(arrCN(1))6
Dim code As Integer = (area << 8) + pos7
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 2513
Dim max As Integer = 5529014
If i <> 25 Then15
max = areacode(i + 1)16
End If17
If areacode(i) <= code AndAlso code < max Then18
Return System.Text.Encoding.[Default].GetString(New Byte() {CByte((65 + i))})19
End If20
Next21
Return "*"22
Else23
Return cnChar24
End If25
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
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


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