C#获取文字的首字母

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

namespace DAL.TOOLDAL
{
    public class ConvertPY
    {
        public string GetPYString(string str)
        {
            string tempStr = "";
            foreach (char c in str)
            {

                if ((int)c >= 33 && (int)c <= 126 || (int)c == 32 || (int)c == 65289 || (int)c == 65288) //(int) c == 65289 || (int) c == 65288 当输入全角括号时
                {//字母和符号原样保留  
                    if ((int)c == 65289 || (int)c == 65288)
                    {
                        if ((int)c == 65288) tempStr += "(";//输入全角括号时变为半角
                        if ((int)c == 65289) tempStr += ")";
                    }

                    else
                        tempStr += c.ToString();
                }
                else
                {//累加拼音声母  
                    tempStr += GetPYChar(c.ToString());
                }
            }
            return tempStr;
        }
        /// <summary>
        /// 取单个字符的拼音声母
        /// <param name="c">要转换的单个汉字</param>
        /// <returns>拼音声母</returns>
        public string GetPYChar(string c)
        {
            byte[] array = new byte[2];
            array = System.Text.Encoding.Default.GetBytes(c);
            int i = (short)(array[0] - '\0') * 256 + ((short)(array[1] - '\0'));
            if (i == 58557) return "H";//浣字的首字母
            if (i == 63182) return "X";//鑫字首字母
            if (i == 60105) return "S";//晟字首字母
            if (i == 59627) return "H";//桦字首字母
            if (i < 0xB0A1) return "*";
            if (i < 0xB0C5) return "A";
            if (i < 0xB2C1) return "B";
            if (i < 0xB4EE) return "C";
            if (i < 0xB6EA) return "D";
            if (i < 0xB7A2) return "E";
            if (i < 0xB8C1) return "F";
            if (i < 0xB9FE) return "G";
            if (i < 0xBBF7) return "H";
            if (i < 0xBFA6) return "J";
            if (i < 0xC0AC) return "K";
            if (i < 0xC2E8) return "L";
            if (i < 0xC4C3) return "M";
            if (i < 0xC5B6) return "N";
            if (i < 0xC5BE) return "O";
            if (i < 0xC6DA) return "P";
            if (i < 0xC8BB) return "Q";
            if (i < 0xC8F6) return "R";
            if (i < 0xCBFA) return "S";
            if (i < 0xCDDA) return "T";
            if (i < 0xCEF4) return "W";
            if (i < 0xD1B9) return "X";
            if (i < 0xD4D1) return "Y";
            if (i < 0xD7FA) return "Z";

            return "*";
        }

    }
}