?using System;
using System.Collections.Generic;
using System.Text;

namespace BusinessLayer
{
    public class ConverString
    { 
        
		 public static string ConverChar(string input)
        {
			StringBuilder s=new StringBuilder(input);
            string c = "";
			for(int i=0;i<s.Length;i++)
			{
				c=c+Convert(s[i]);
			}		
		    return c;
		}
		public static char Convert(Char chinese)
		{
			Encoding gb2312 = Encoding.GetEncoding("GB2312");
			Encoding unicode = Encoding.Unicode;

			// Convert the string into a byte[].
			byte[] unicodeBytes = unicode.GetBytes(new Char[] {chinese});
			// Perform the conversion from one encoding to the other.
			byte[] asciiBytes = Encoding.Convert(unicode, gb2312, unicodeBytes);

			// 計算該漢字的GB-2312編碼
			int n = (int)asciiBytes[0]<<8;
			n += (int)asciiBytes[1];

			// 根據漢字區域碼獲取拼音聲母
			if (In(0xB0A1,0xB0C4,n)) return 'a';
			if (In(0XB0C5,0XB2C0,n)) return 'b';
			if (In(0xB2C1,0xB4ED,n)) return 'c';
			if (In(0xB4EE,0xB6E9,n)) return 'd';
			if (In(0xB6EA,0xB7A1,n)) return 'e';
			if (In(0xB7A2,0xB8c0,n)) return 'f';
			if (In(0xB8C1,0xB9FD,n)) return 'g';
			if (In(0xB9FE,0xBBF6,n)) return 'h';
			if (In(0xBBF7,0xBFA5,n)) return 'j';
			if (In(0xBFA6,0xC0AB,n)) return 'k';
			if (In(0xC0AC,0xC2E7,n)) return 'l';
			if (In(0xC2E8,0xC4C2,n)) return 'm';
			if (In(0xC4C3,0xC5B5,n)) return 'n';
			if (In(0xC5B6,0xC5BD,n)) return 'o';
			if (In(0xC5BE,0xC6D9,n)) return 'p';
			if (In(0xC6DA,0xC8BA,n)) return 'q';
			if (In(0xC8BB,0xC8F5,n)) return 'r';
			if (In(0xC8F6,0xCBF0,n)) return 's';
			if (In(0xCBFA,0xCDD9,n)) return 't';
			if (In(0xCDDA,0xCEF3,n)) return 'w';
			if (In(0xCEF4,0xD188,n)) return 'x';
			if (In(0xD1B9,0xD4D0,n)) return 'y';
			if (In(0xD4D1,0xD7F9,n)) return 'z';
			return '\0';
		}
		private static bool In(int Lp, int Hp, int Value)
		{
			return ((Value<=Hp)&&(Value>=Lp));
		}
    }
}