C# 获取汉字拼音首字母（修正X问题,真正修正）

话不多说,直接上代码,代码参考网上源码.其中存在X显示为?的问题.一共两种写法.目前该写法还是存在部分汉字无法正常转化的问题.另外一种方法在另一个帖子中说明.

帖子链接 : https://www.cnblogs.com/dygood/p/12015120.html

        /// <summary>
        /// 将输入字符串英文部分变为大写,中文取拼音首字母大写.
        /// </summary>
        /// <param name="UnName"></param>
        /// <returns></returns>
        public static string GetCodstring(string UnName,string Coding)
        {
            try
            {
                int i = 0;
                ushort key = 0;
                string strResult = string.Empty;
                Encoding unicode = Encoding.Unicode;
                Encoding gbk = Encoding.GetEncoding(Coding);
                byte[] unicodeBytes = unicode.GetBytes(UnName);
                byte[] gbkBytes = Encoding.Convert(unicode, gbk, unicodeBytes);
                while (i < gbkBytes.Length)
                {
                    if (gbkBytes[i] <= 127)
                    {
                        strResult = strResult + ((char)gbkBytes[i]).ToString().ToUpper();
                        i++;
                    }
                    #region 生成汉字拼音简码,取拼音首字母
                    else
                    {
                        key = (ushort)(gbkBytes[i] * 256 + gbkBytes[i + 1]);
                        if (key >= 'uB0A1' && key <= 'uB0C4')
                            strResult = strResult + "A";
                        else if (key >= 'uB0C5' && key <= 'uB2C0')
                            strResult = strResult + "B";
                        else if (key >= 'uB2C1' && key <= 'uB4ED')
                            strResult = strResult + "C";
                        else if (key >= 'uB4EE' && key <= 'uB6E9')
                            strResult = strResult + "D";
                        else if (key >= 'uB6EA' && key <= 'uB7A1')
                            strResult = strResult + "E";
                        else if (key >= 'uB7A2' && key <= 'uB8C0')
                            strResult = strResult + "F";
                        else if (key >= 'uB8C1' && key <= 'uB9FD')
                            strResult = strResult + "G";
                        else if (key >= 'uB9FE' && key <= 'uBBF6')
                            strResult = strResult + "H";
                        else if (key >= 'uBBF7' && key <= 'uBFA5')
                            strResult = strResult + "J";
                        else if (key >= 'uBFA6' && key <= 'uC0AB')
                            strResult = strResult + "K";
                        else if (key >= 'uC0AC' && key <= 'uC2E7')
                            strResult = strResult + "L";
                        else if (key >= 'uC2E8' && key <= 'uC4C2')
                            strResult = strResult + "M";
                        else if (key >= 'uC4C3' && key <= 'uC5B5')
                            strResult = strResult + "N";
                        else if (key >= 'uC5B6' && key <= 'uC5BD')
                            strResult = strResult + "O";
                        else if (key >= 'uC5BE' && key <= 'uC6D9')
                            strResult = strResult + "P";
                        else if (key >= 'uC6DA' && key <= 'uC8BA')
                            strResult = strResult + "Q";
                        else if (key >= 'uC8BB' && key <= 'uC8F5')
                            strResult = strResult + "R";
                        else if (key >= 'uC8F6' && key <= 'uCBF9')
                            strResult = strResult + "S";
                        else if (key >= 'uCBFA' && key <= 'uCDD9')
                            strResult = strResult + "T";
                        else if (key >= 'uCDDA' && key <= 'uCEF3')
                            strResult = strResult + "W";
                        else if (key >= 'uCEF4' && key <= 'uD1B8')
                            strResult = strResult + "X";
                        else if (key >= 'uD1B9' && key <= 'uD4D0')
                            strResult = strResult + "Y";
                        else if (key >= 'uD4D1' && key <= 'uD7F9')
                            strResult = strResult + "Z";
                        else
                            strResult = strResult + "?";
                        i = i + 2;
                    }
                    #endregion
                }
                return strResult;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
                return "";
            }
        }
        /// <summary> 
        /// 在指定的字符串列表CnStr中检索符合拼音索引字符串 
        /// </summary> 
        /// <param name="CnStr">汉字字符串</param> 
        /// <returns>相对应的汉语拼音首字母串</returns> 
        public static string GetSpellCode(string CnStr)
        {
            string strTemp = "";
            int iLen = CnStr.Length;
            int i = 0;
            for (i = 0; i <= iLen - 1; i++)
            {
                strTemp += GetCharSpellCode(CnStr.Substring(i, 1));
            }
            return strTemp;
        }
        /// <summary> 
        /// 得到一个汉字的拼音第一个字母，如果是一个英文字母则直接返回大写字母 
        /// </summary> 
        /// <param name="CnChar">单个汉字</param> 
        /// <returns>单个大写字母</returns> 
        private static string GetCharSpellCode(string CnChar)
        {
            long iCnChar;
            byte[] ZW = System.Text.Encoding.GetEncoding("GB2312").GetBytes(CnChar);
            //如果是字母，则直接返回 
            if (ZW.Length == 1)
                return CnChar.ToUpper();
            else
            {
                // 从单个字符获取字节数组
                int i1 = (short)(ZW[0]);
                int i2 = (short)(ZW[1]);
                iCnChar = i1 * 256 + i2;
            }
            /* 'A': //45217..45252 
            // 'B': //45253..45760 
            // 'C': //45761..46317 
            // 'D': //46318..46825 
            // 'E': //46826..47009 
            // 'F': //47010..47296 
            // 'G': //47297..47613 
            // 'H': //47614..48118 
            // 'J': //48119..49061 
            // 'K': //49062..49323 
            // 'L': //49324..49895 
            // 'M': //49896..50370 
            // 'N': //50371..50613 
            // 'O': //50614..50621 
            // 'P': //50622..50905 
            // 'Q': //50906..51386 
            // 'R': //51387..51445 
            // 'S': //51446..52217 
            // 'T': //52218..52697
            // 汉字没有没有U,V 开始的
            // 'W': //52698..52979 
            // 'X': //52980..53688
            // 'Y': //53689..54480 
            // 'Z': //54481..55289 
            // iCnChar 匹配常量*/
            if ((iCnChar >= 45217) && (iCnChar <= 45252))
                return "A";
            else if ((iCnChar >= 45253) && (iCnChar <= 45760))
                return "B";
            else if ((iCnChar >= 45761) && (iCnChar <= 46317))
                return "C";
            else if ((iCnChar >= 46318) && (iCnChar <= 46825))
                return "D";
            else if ((iCnChar >= 46826) && (iCnChar <= 47009))
                return "E";
            else if ((iCnChar >= 47010) && (iCnChar <= 47296))
                return "F";
            else if ((iCnChar >= 47297) && (iCnChar <= 47613))
                return "G";
            else if ((iCnChar >= 47614) && (iCnChar <= 48118))
                return "H";
            else if ((iCnChar >= 48119) && (iCnChar <= 49061))
                return "J";
            else if ((iCnChar >= 49062) && (iCnChar <= 49323))
                return "K";
            else if ((iCnChar >= 49324) && (iCnChar <= 49895))
                return "L";
            else if ((iCnChar >= 49896) && (iCnChar <= 50370))
                return "M";
            else if ((iCnChar >= 50371) && (iCnChar <= 50613))
                return "N";
            else if ((iCnChar >= 50614) && (iCnChar <= 50621))
                return "O";
            else if ((iCnChar >= 50622) && (iCnChar <= 50905))
                return "P";
            else if ((iCnChar >= 50906) && (iCnChar <= 51386))
                return "Q";
            else if ((iCnChar >= 51387) && (iCnChar <= 51445))
                return "R";
            else if ((iCnChar >= 51446) && (iCnChar <= 52217))
                return "S";
            else if ((iCnChar >= 52218) && (iCnChar <= 52697))
                return "T";
            else if ((iCnChar >= 52698) && (iCnChar <= 52979))
                return "W";
            else if ((iCnChar >= 52980) && (iCnChar <= 53688))
                return "X";
            else if ((iCnChar >= 53689) && (iCnChar <= 54480))
                return "Y";
            else if ((iCnChar >= 54481) && (iCnChar <= 55289))
                return "Z";
            else return ("?");
        }