汉字获取首字母

时间：2010-08-31 来源：valin

今天贴两段用通过c#实现汉字获取首字母的方法，希望对大家有所帮助。

方法一：

代码 class ChinesSpell
{

    private const int constA = 45217;
    private const int constB = 45253;
    private const int constC = 45761;
    private const int constD = 46318;
    private const int constE = 46826;
    private const int constF = 47010;
    private const int constG = 47297;
    private const int constH = 47614;
    private const int constJ = 48119;
    private const int constK = 49062;
    private const int constL = 49324;
    private const int constM = 49896;
    private const int constN = 50371;
    private const int constO = 50614;
    private const int constP = 50622;
    private const int constQ = 50906;
    private const int constR = 51387;
    private const int constS = 51446;
    private const int constT = 52218;
    private const int constW = 52698;
    private const int constX = 52980;
    private const int constY = 53689;
    private const int constZ = 54481;

    public ChinesSpell()
    { }

    public static string GetCharSpellCode(string CnChar)
    {
        long iCnChar;
        byte[] HZ = System.Text.Encoding.Default.GetBytes(CnChar);
        if (HZ.Length == 1)
        {
            return CnChar.ToUpper();
        }
        else
        {
            int a1 = (short)(HZ[0]);
            int a2 = (short)(HZ[1]);
            iCnChar = a1 * 256 + a2;
        }
        return GetChar(iCnChar);
    }

    private static string GetChar(long iCnChar)
    {
        if (CompareChar(iCnChar, constA, constB))
        {
            return "A";
        }
        if (CompareChar(iCnChar, constB, constC))
        {
            return "B";
        }
        if (CompareChar(iCnChar, constC, constD))
        {
            return "C";
        }
        if (CompareChar(iCnChar, constD, constE))
        {
            return "D";
        }
        if (CompareChar(iCnChar, constE, constF))
        {
            return "E";
        }
        if (CompareChar(iCnChar, constF, constG))
        {
            return "F";
        }
        if (CompareChar(iCnChar, constG, constH))
        {
            return "G";
        }
        if (CompareChar(iCnChar, constH, constJ))
        {
            return "H";
        }
        if (CompareChar(iCnChar, constJ, constK))
        {
            return "J";
        }
        if (CompareChar(iCnChar, constK, constL))
        {
            return "K";
        }
        if (CompareChar(iCnChar, constL, constM))
        {
            return "L";
        }
        if (CompareChar(iCnChar, constM, constN))
        {
            return "M";
        }
        if (CompareChar(iCnChar, constN, constO))
        {
            return "N";
        }
        if (CompareChar(iCnChar, constO, constP))
        {
            return "O";
        }
        if (CompareChar(iCnChar, constP, constQ))
        {
            return "P";
        }
        if (CompareChar(iCnChar, constQ, constR))
        {
            return "Q";
        }
        if (CompareChar(iCnChar, constR, constS))
        {
            return "R";
        }
        if (CompareChar(iCnChar, constS, constT))
        {
            return "S";
        }
        if (CompareChar(iCnChar, constT, constW))
        {
            return "T";
        }
        if (CompareChar(iCnChar, constW, constX))
        {
            return "W";
        }
        if (CompareChar(iCnChar, constX, constY))
        {
            return "X";
        }
        if (CompareChar(iCnChar, constY, constZ))
        {
            return "Y";
        }
        if (CompareChar(iCnChar, constZ, 55289))
        {
            return "Z";
        }
        else
        {
            return "*";
        }
    }
    private static bool CompareChar(long iCnChar, int S, int E)
    {
        if (iCnChar >= S && iCnChar < E)
        {
            return true;
        }
        else
        {
            return false;
        }

    }
}

方法二：

代码 class ChinesSpell2
{
      static public string GetChineseSpell(string strText)
         {
             int len = strText.Length;
             string myStr = "";
             for (int i = 0; i < len; i++)
             {
                 myStr += getSpell(strText.Substring(i, 1));
             }
             return myStr;
         }

         static public string[] GetChineseSpell(string[] strText)
         {
             int len = strText.Length;
             string[] myStr = null;
             for (int i = 0; i < len; i++)
             {
                 myStr[i] = getSpell(strText[i]);
             }
             return myStr;
         }

         static public string getSpell(string cnChar)
         {
             byte[] arrCN =System.Text.Encoding.Default.GetBytes(cnChar);
             if (arrCN.Length > 1)
             {
                 int area = (short)arrCN[0];
                 int pos = (short)arrCN[1];
                 int code = (area << 8) + pos;
                 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 };
                 for (int i = 0; i < 26; i++)
                 {
                     int max = 55290;
                     if (i != 25) max = areacode[i + 1];
                     if (areacode[i] <= code && code < max)
                     {
                         return System.Text.Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
                     }
                 }
                 return "*";
             }
             else return cnChar;
         }

}