在.Net下获取中文字符拼音的首字母(一般排序时用到)

在.Net下获取中文字符拼音的首字母(一般排序时用到)
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/**//*==============================================================================
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* Name: ChineseLetter
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* Author: Zhu JianFeng
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* Date: 2007-5-7
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* DESC: Get the first letter of pinyin according to specified Chinese character code
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==============================================================================*/
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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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namespace Babyer
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{
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public class ChineseLetter
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{
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public static string GetFirstLetter(string chineseStr)
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{
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byte[] _cBs = System.Text.Encoding.Default.GetBytes(chineseStr);
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if(_cBs.Length<2)
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return chineseStr;
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byte ucHigh, ucLow;
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int nCode;
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string strFirstLetter = string.Empty;
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for (int i = 0; i < _cBs.Length; i++)
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{
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if (_cBs[i] < 0x80)
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{
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strFirstLetter += Encoding.Default.GetString(_cBs, i, 1);
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continue;
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}
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ucHigh = (byte)_cBs[i];
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ucLow = (byte)_cBs[i + 1];
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if ( ucHigh < 0xa1 || ucLow < 0xa1)
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continue;
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else
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// Treat code by section-position as an int type parameter,
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// so make following change to nCode.
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nCode = (ucHigh - 0xa0) * 100 + ucLow - 0xa0;
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string str = FirstLetter(nCode);
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strFirstLetter += str != string.Empty ? str : Encoding.Default.GetString(_cBs, i, 2);
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i++;
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}
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return strFirstLetter;
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}
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/**//// <summary>
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/// Get the first letter of pinyin according to specified Chinese character code
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/// </summary>
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/// <param name="nCode">the code of the chinese character</param>
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/// <returns>receive the string of the first letter</returns>
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public static string FirstLetter(int nCode)
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{
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string strLetter = string.Empty;
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if(nCode >= 1601 && nCode < 1637) strLetter = "A";
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if(nCode >= 1637 && nCode < 1833) strLetter = "B";
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if(nCode >= 1833 && nCode < 2078) strLetter = "C";
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if(nCode >= 2078 && nCode < 2274) strLetter = "D";
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if(nCode >= 2274 && nCode < 2302) strLetter = "E";
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if(nCode >= 2302 && nCode < 2433) strLetter = "F";
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if(nCode >= 2433 && nCode < 2594) strLetter = "G";
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if(nCode >= 2594 && nCode < 2787) strLetter = "H";
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if(nCode >= 2787 && nCode < 3106) strLetter = "J";
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if(nCode >= 3106 && nCode < 3212) strLetter = "K";
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if(nCode >= 3212 && nCode < 3472) strLetter = "L";
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if(nCode >= 3472 && nCode < 3635) strLetter = "M";
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if(nCode >= 3635 && nCode < 3722) strLetter = "N";
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if(nCode >= 3722 && nCode < 3730) strLetter = "O";
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if(nCode >= 3730 && nCode < 3858) strLetter = "P";
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if(nCode >= 3858 && nCode < 4027) strLetter = "Q";
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if(nCode >= 4027 && nCode < 4086) strLetter = "R";
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if(nCode >= 4086 && nCode < 4390) strLetter = "S";
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if(nCode >= 4390 && nCode < 4558) strLetter = "T";
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if(nCode >= 4558 && nCode < 4684) strLetter = "W";
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if(nCode >= 4684 && nCode < 4925) strLetter = "X";
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if(nCode >= 4925 && nCode < 5249) strLetter = "Y";
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if(nCode >= 5249 && nCode < 5590) strLetter = "Z";
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//if (strLetter == string.Empty)
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// System.Windows.Forms.MessageBox.Show(String.Format("信息：/n{0}为非常用字符编码,不能为您解析相应匹配首字母！",nCode));
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return strLetter;
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}
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}
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}

这里只能解析常用字符,如果非常用字符,我想只有用字典了,如果有更好的方法也欢迎一起探讨.