获取中文字符拼音的首字母代码,Asp.Net代码库,德仔网

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【Asp.Net】获取中文字符拼音的首字母

作者:dezai / 发布于2014/5/21/ 481

在.Net下获取中文字符拼音的首字母(一般排序时用到)


	/*==============================================================================
	* Name: ChineseLetter
	* Author: Zhu JianFeng
	* Date: 2007-5-7
	* DESC: Get the first letter of pinyin according to specified Chinese character code
	==============================================================================*/
	using System;
	using System.Collections.Generic;
	using System.Text;

	namespace Babyer
	{
	 public class ChineseLetter
	 {
	 public static string GetFirstLetter(string chineseStr)
	 {
	 byte[] _cBs = System.Text.Encoding.Default.GetBytes(chineseStr);

	 if(_cBs.Length<2)
	 return chineseStr;

	 byte ucHigh, ucLow;
	 int nCode;

	 string strFirstLetter = string.Empty;

	 for (int i = 0; i < _cBs.Length; i++)
	 {

	 if (_cBs[i] < 0x80)
	 {
	 strFirstLetter += Encoding.Default.GetString(_cBs, i, 1);
	 continue;
	 }

	 ucHigh = (byte)_cBs[i];
	 ucLow = (byte)_cBs[i + 1];
	 if ( ucHigh < 0xa1 || ucLow < 0xa1)
	 continue;
	 else
	 // Treat code by section-position as an int type parameter,
	 // so make following change to nCode.
	 nCode = (ucHigh - 0xa0) * 100 + ucLow - 0xa0;

	 string str = FirstLetter(nCode);
	 strFirstLetter += str != string.Empty ? str : Encoding.Default.GetString(_cBs, i, 2);
	 i++;
	 }
	 return strFirstLetter;
	 }

	 /// <summary>
	 /// Get the first letter of pinyin according to specified Chinese character code
	 /// </summary>
	 /// <param name="nCode">the code of the chinese character</param>
	 /// <returns>receive the string of the first letter</returns>
	 public static string FirstLetter(int nCode)
	 {
	 string strLetter = string.Empty;

	 if(nCode >= 1601 && nCode < 1637) strLetter = "A";
	 if(nCode >= 1637 && nCode < 1833) strLetter = "B";
	 if(nCode >= 1833 && nCode < 2078) strLetter = "C";
	 if(nCode >= 2078 && nCode < 2274) strLetter = "D";
	 if(nCode >= 2274 && nCode < 2302) strLetter = "E";
	 if(nCode >= 2302 && nCode < 2433) strLetter = "F";
	 if(nCode >= 2433 && nCode < 2594) strLetter = "G";
	 if(nCode >= 2594 && nCode < 2787) strLetter = "H";
	 if(nCode >= 2787 && nCode < 3106) strLetter = "J";
	 if(nCode >= 3106 && nCode < 3212) strLetter = "K";
	 if(nCode >= 3212 && nCode < 3472) strLetter = "L";
	 if(nCode >= 3472 && nCode < 3635) strLetter = "M";
	 if(nCode >= 3635 && nCode < 3722) strLetter = "N";
	 if(nCode >= 3722 && nCode < 3730) strLetter = "O";
	 if(nCode >= 3730 && nCode < 3858) strLetter = "P";
	 if(nCode >= 3858 && nCode < 4027) strLetter = "Q";
	 if(nCode >= 4027 && nCode < 4086) strLetter = "R";
	 if(nCode >= 4086 && nCode < 4390) strLetter = "S";
	 if(nCode >= 4390 && nCode < 4558) strLetter = "T";
	 if(nCode >= 4558 && nCode < 4684) strLetter = "W";
	 if(nCode >= 4684 && nCode < 4925) strLetter = "X";
	 if(nCode >= 4925 && nCode < 5249) strLetter = "Y";
	 if(nCode >= 5249 && nCode < 5590) strLetter = "Z";

	 //if (strLetter == string.Empty)
	 // 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));
	 return strLetter;
	 }
	 }
	}

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