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ASP.NET获取汉字首字母

/// <summary>
    /// 获取汉字首字母(可包含多个汉字)
    /// </summary>
    /// <param name="strText"></param>
    /// <returns></returns>
    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;
    }

    public string getSpell(string cnChar)
  {
      byte[] arrCN = 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 Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
              }
          }
          return "*";
      }
      else 
        return cnChar;
  }

ASP.NET获取汉字首字母