public class GetStringSpell
   {
       /// <summary>  
       /// 提取汉字首字母  
       /// </summary>  
       /// <param name="strText">需要转换的字</param>  
       /// <returns>转换结果</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;
       }
       /// <summary>  
       /// 把提取的字母变成大写  
       /// </summary>  
       /// <param name="strText">需要转换的字符串</param>  
       /// <returns>转换结果</returns>  
       public string GetLowerChineseSpell(string strText)
       {
           return GetChineseSpell(strText).ToLower();
       }
       /// <summary>  
       /// 把提取的字母变成大写  
       /// </summary>  
       /// <param name="myChar">需要转换的字符串</param>  
       /// <returns>转换结果</returns>  
       public  string GetUpperChineseSpell(string strText)
       {
           return GetChineseSpell(strText).ToUpper();
       }
       /// <summary>  
       /// 获取单个汉字的首拼音  
       /// </summary>  
       /// <param name="myChar">需要转换的字符</param>  
       /// <returns>转换结果</returns>  
       public static string getSpell(string myChar)
       {
           byte[] arrCN = System.Text.Encoding.Default.GetBytes(myChar);
           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 myChar;
       }
   }