汉字提取拼音首字母修正

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace GetCNSpell
{
    public class GetCNSpell
    {
        /// <summary>  
        /// 提取汉字首字母  
        /// </summary> 施彪 
        /// <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>  
        /// 把提取的字母变成小写  
        /// </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 string getSpell(string str)
        {
            if (str.CompareTo("吖") < 0)
            {
                string s = str.Substring(0, 1);
                if (char.IsNumber(s, 0))
                {
                    return s;
                }
                else
                {
                    return s;
                }
            }
            else if (str.CompareTo("八") < 0)
            {
                return "A";
            }
            else if (str.CompareTo("嚓") < 0)
            {
                return "B";
            }
            else if (str.CompareTo("咑") < 0)
            {
                return "C";
            }
            else if (str.CompareTo("妸") < 0)
            {
                return "D";
            }
            else if (str.CompareTo("发") < 0)
            {
                return "E";
            }
            else if (str.CompareTo("旮") < 0)
            {
                return "F";
            }
            else if (str.CompareTo("铪") < 0)
            {
                return "G";
            }
            else if (str.CompareTo("讥") < 0)
            {
                return "H";
            }
            else if (str.CompareTo("咔") < 0)
            {
                return "J";
            }
            else if (str.CompareTo("垃") < 0)
            {
                return "K";
            }
            else if (str.CompareTo("嘸") < 0)
            {
                return "L";
            }
            else if (str.CompareTo("拏") < 0)
            {
                return "M";
            }
            else if (str.CompareTo("噢") < 0)
            {
                return "N";
            }
            else if (str.CompareTo("妑") < 0)
            {
                return "O";
            }
            else if (str.CompareTo("七") < 0)
            {
                return "P";
            }
            else if (str.CompareTo("亽") < 0)
            {
                return "Q";
            }
            else if (str.CompareTo("仨") < 0)
            {
                return "R";
            }
            else if (str.CompareTo("他") < 0)
            {
                return "S";
            }
            else if (str.CompareTo("哇") < 0)
            {
                return "T";
            }
            else if (str.CompareTo("夕") < 0)
            {
                return "W";
            }
            else if (str.CompareTo("丫") < 0)
            {
                return "X";
            }
            else if (str.CompareTo("帀") < 0)
            {
                return "Y";
            }
            else if (str.CompareTo("咗") < 0)
            {
                return "Z";
            }
            else
            {
                return str;
            }
        }

    }
}