C# Detailed explanation of Chinese character conversion Pinyin technology ( High performance )

The source code is posted below .
public static class ChineseToPinYin  
        {  
            private static readonly Dictionary<int, string> CodeCollections = new Dictionary<int, string> {  
 { -20319, "a" }, { -20317, "ai" }, { -20304, "an" }, { -20295, "ang" }, { -20292, "ao" }, { -20283, "ba" }, { -20265, "bai" },   
{ -20257, "ban" }, { -20242, "bang" }, { -20230, "bao" }, { -20051, "bei" }, { -20036, "ben" }, { -20032, "beng" }, { -20026, "bi" }  
, { -20002, "bian" }, { -19990, "biao" }, { -19986, "bie" }, { -19982, "bin" }, { -19976, "bing" }, { -19805, "bo" },   
{ -19784, "bu" }, { -19775, "ca" }, { -19774, "cai" }, { -19763, "can" }, { -19756, "cang" }, { -19751, "cao" }, { -19746, "ce" },  
 { -19741, "ceng" }, { -19739, "cha" }, { -19728, "chai" }, { -19725, "chan" }, { -19715, "chang" }, { -19540, "chao" },   
{ -19531, "che" }, { -19525, "chen" }, { -19515, "cheng" }, { -19500, "chi" }, { -19484, "chong" }, { -19479, "chou" },   
{ -19467, "chu" }, { -19289, "chuai" }, { -19288, "chuan" }, { -19281, "chuang" }, { -19275, "chui" }, { -19270, "chun" },  
 { -19263, "chuo" }, { -19261, "ci" }, { -19249, "cong" }, { -19243, "cou" }, { -19242, "cu" }, { -19238, "cuan" },   
{ -19235, "cui" }, { -19227, "cun" }, { -19224, "cuo" }, { -19218, "da" }, { -19212, "dai" }, { -19038, "dan" }, { -19023, "dang" },  
 { -19018, "dao" }, { -19006, "de" }, { -19003, "deng" }, { -18996, "di" }, { -18977, "dian" }, { -18961, "diao" }, { -18952, "die" }  
, { -18783, "ding" }, { -18774, "diu" }, { -18773, "dong" }, { -18763, "dou" }, { -18756, "du" }, { -18741, "duan" },   
{ -18735, "dui" }, { -18731, "dun" }, { -18722, "duo" }, { -18710, "e" }, { -18697, "en" }, { -18696, "er" }, { -18526, "fa" },  
 { -18518, "fan" }, { -18501, "fang" }, { -18490, "fei" }, { -18478, "fen" }, { -18463, "feng" }, { -18448, "fo" }, { -18447, "fou" }  
, { -18446, "fu" }, { -18239, "ga" }, { -18237, "gai" }, { -18231, "gan" }, { -18220, "gang" }, { -18211, "gao" }, { -18201, "ge" },  
 { -18184, "gei" }, { -18183, "gen" }, { -18181, "geng" }, { -18012, "gong" }, { -17997, "gou" }, { -17988, "gu" }, { -17970, "gua" }  
, { -17964, "guai" }, { -17961, "guan" }, { -17950, "guang" }, { -17947, "gui" }, { -17931, "gun" }, { -17928, "guo" },  
{ -17922, "ha" }, { -17759, "hai" }, { -17752, "han" }, { -17733, "hang" }, { -17730, "hao" }, { -17721, "he" }, { -17703, "hei" },  
 { -17701, "hen" }, { -17697, "heng" }, { -17692, "hong" }, { -17683, "hou" }, { -17676, "hu" }, { -17496, "hua" },   
{ -17487, "huai" }, { -17482, "huan" }, { -17468, "huang" }, { -17454, "hui" }, { -17433, "hun" }, { -17427, "huo" },   
{ -17417, "ji" }, { -17202, "jia" }, { -17185, "jian" }, { -16983, "jiang" }, { -16970, "jiao" }, { -16942, "jie" },   
{ -16915, "jin" }, { -16733, "jing" }, { -16708, "jiong" }, { -16706, "jiu" }, { -16689, "ju" }, { -16664, "juan" },   
{ -16657, "jue" }, { -16647, "jun" }, { -16474, "ka" }, { -16470, "kai" }, { -16465, "kan" }, { -16459, "kang" }, { -16452, "kao" },  
 { -16448, "ke" }, { -16433, "ken" }, { -16429, "keng" }, { -16427, "kong" }, { -16423, "kou" }, { -16419, "ku" }, { -16412, "kua" }  
, { -16407, "kuai" }, { -16403, "kuan" }, { -16401, "kuang" }, { -16393, "kui" }, { -16220, "kun" }, { -16216, "kuo" },   
{ -16212, "la" }, { -16205, "lai" }, { -16202, "lan" }, { -16187, "lang" }, { -16180, "lao" }, { -16171, "le" }, { -16169, "lei" },   
{ -16158, "leng" }, { -16155, "li" }, { -15959, "lia" }, { -15958, "lian" }, { -15944, "liang" }, { -15933, "liao" },   
{ -15920, "lie" }, { -15915, "lin" }, { -15903, "ling" }, { -15889, "liu" }, { -15878, "long" }, { -15707, "lou" }, { -15701, "lu" },  
 { -15681, "lv" }, { -15667, "luan" }, { -15661, "lue" }, { -15659, "lun" }, { -15652, "luo" }, { -15640, "ma" }, { -15631, "mai" },  
 { -15625, "man" }, { -15454, "mang" }, { -15448, "mao" }, { -15436, "me" }, { -15435, "mei" }, { -15419, "men" },   
{ -15416, "meng" }, { -15408, "mi" }, { -15394, "mian" }, { -15385, "miao" }, { -15377, "mie" }, { -15375, "min" },   
{ -15369, "ming" }, { -15363, "miu" }, { -15362, "mo" }, { -15183, "mou" }, { -15180, "mu" }, { -15165, "na" }, { -15158, "nai" },   
{ -15153, "nan" }, { -15150, "nang" }, { -15149, "nao" }, { -15144, "ne" }, { -15143, "nei" }, { -15141, "nen" }, { -15140, "neng" }  
, { -15139, "ni" }, { -15128, "nian" }, { -15121, "niang" }, { -15119, "niao" }, { -15117, "nie" }, { -15110, "nin" },   
{ -15109, "ning" }, { -14941, "niu" }, { -14937, "nong" }, { -14933, "nu" }, { -14930, "nv" }, { -14929, "nuan" }, { -14928, "nue" }  
, { -14926, "nuo" }, { -14922, "o" }, { -14921, "ou" }, { -14914, "pa" }, { -14908, "pai" }, { -14902, "pan" }, { -14894, "pang" },  
 { -14889, "pao" }, { -14882, "pei" }, { -14873, "pen" }, { -14871, "peng" }, { -14857, "pi" }, { -14678, "pian" },   
{ -14674, "piao" }, { -14670, "pie" }, { -14668, "pin" }, { -14663, "ping" }, { -14654, "po" }, { -14645, "pu" }, { -14630, "qi" },  
 { -14594, "qia" }, { -14429, "qian" }, { -14407, "qiang" }, { -14399, "qiao" }, { -14384, "qie" }, { -14379, "qin" },  
 { -14368, "qing" }, { -14355, "qiong" }, { -14353, "qiu" }, { -14345, "qu" }, { -14170, "quan" }, { -14159, "que" },   
{ -14151, "qun" }, { -14149, "ran" }, { -14145, "rang" }, { -14140, "rao" }, { -14137, "re" }, { -14135, "ren" }, { -14125, "reng" }  
, { -14123, "ri" }, { -14122, "rong" }, { -14112, "rou" }, { -14109, "ru" }, { -14099, "ruan" }, { -14097, "rui" }, { -14094, "run" }  
, { -14092, "ruo" }, { -14090, "sa" }, { -14087, "sai" }, { -14083, "san" }, { -13917, "sang" }, { -13914, "sao" }, { -13910, "se" }  
, { -13907, "sen" }, { -13906, "seng" }, { -13905, "sha" }, { -13896, "shai" }, { -13894, "shan" }, { -13878, "shang" },   
{ -13870, "shao" }, { -13859, "she" }, { -13847, "shen" }, { -13831, "sheng" }, { -13658, "shi" }, { -13611, "shou" },  
 { -13601, "shu" }, { -13406, "shua" }, { -13404, "shuai" }, { -13400, "shuan" }, { -13398, "shuang" }, { -13395, "shui" },  
 { -13391, "shun" }, { -13387, "shuo" }, { -13383, "si" }, { -13367, "song" }, { -13359, "sou" }, { -13356, "su" },   
{ -13343, "suan" }, { -13340, "sui" }, { -13329, "sun" }, { -13326, "suo" }, { -13318, "ta" }, { -13147, "tai" }, { -13138, "tan" },  
 { -13120, "tang" }, { -13107, "tao" }, { -13096, "te" }, { -13095, "teng" }, { -13091, "ti" }, { -13076, "tian" },   
{ -13068, "tiao" }, { -13063, "tie" }, { -13060, "ting" }, { -12888, "tong" }, { -12875, "tou" }, { -12871, "tu" },   
{ -12860, "tuan" }, { -12858, "tui" }, { -12852, "tun" }, { -12849, "tuo" }, { -12838, "wa" }, { -12831, "wai" }, { -12829, "wan" }  
, { -12812, "wang" }, { -12802, "wei" }, { -12607, "wen" }, { -12597, "weng" }, { -12594, "wo" }, { -12585, "wu" }, { -12556, "xi" }  
, { -12359, "xia" }, { -12346, "xian" }, { -12320, "xiang" }, { -12300, "xiao" }, { -12120, "xie" }, { -12099, "xin" },   
{ -12089, "xing" }, { -12074, "xiong" }, { -12067, "xiu" }, { -12058, "xu" }, { -12039, "xuan" }, { -11867, "xue" },   
{ -11861, "xun" }, { -11847, "ya" }, { -11831, "yan" }, { -11798, "yang" }, { -11781, "yao" }, { -11604, "ye" }, { -11589, "yi" },  
 { -11536, "yin" }, { -11358, "ying" }, { -11340, "yo" }, { -11339, "yong" }, { -11324, "you" }, { -11303, "yu" },   
{ -11097, "yuan" }, { -11077, "yue" }, { -11067, "yun" }, { -11055, "za" }, { -11052, "zai" }, { -11045, "zan" },  
 { -11041, "zang" }, { -11038, "zao" }, { -11024, "ze" }, { -11020, "zei" }, { -11019, "zen" }, { -11018, "zeng" },   
{ -11014, "zha" }, { -10838, "zhai" }, { -10832, "zhan" }, { -10815, "zhang" }, { -10800, "zhao" }, { -10790, "zhe" },   
{ -10780, "zhen" }, { -10764, "zheng" }, { -10587, "zhi" }, { -10544, "zhong" }, { -10533, "zhou" }, { -10519, "zhu" },   
{ -10331, "zhua" }, { -10329, "zhuai" }, { -10328, "zhuan" }, { -10322, "zhuang" }, { -10315, "zhui" }, { -10309, "zhun" },   
{ -10307, "zhuo" }, { -10296, "zi" }, { -10281, "zong" }, { -10274, "zou" }, { -10270, "zu" }, { -10262, "zuan" }, { -10260, "zui" }  
, { -10256, "zun" }, { -10254, "zuo" } };  
            ///   <summary>    
            ///   Chinese character to Pinyin     
            ///   </summary>    
            ///   <param   name="txt"> Chinese characters that need to be converted </param>    
            ///   <returns> Return the Pinyin corresponding to Chinese characters </returns>    
            public static string ToPinYin(string txt)  
            {  
                txt = txt.Trim();  
                byte[] arr = new byte[2];   // Each Chinese character is 2 byte     
                StringBuilder result = new StringBuilder();// Use StringBuilder Optimize string connection    
                int charCode = 0;  
                int arr1 = 0;  
                int arr2 = 0;  
                char[] arrChar = txt.ToCharArray();  
                for (int j = 0; j < arrChar.Length; j++)   // Traverse the input character     
                {  
                    arr = System.Text.Encoding.Default.GetBytes(arrChar[j].ToString());// Get bytecode according to system default encoding     
                    if (arr.Length == 1)// If only 1 The byte indicates that the character is not a Chinese character , End this cycle     
                    {  
                        result.Append(arrChar[j].ToString());  
                        continue;  
  
                    }  
                    arr1 = (short)(arr[0]);   // Take bytes 1    
                    arr2 = (short)(arr[1]);   // Take bytes 2    
                    charCode = arr1 * 256 + arr2 - 65536;// Calculate the coding of Chinese characters     
  
                     if (charCode > -10254 || charCode < -20319)  // If it is not in the range of Chinese character coding, it will not be changed     
                    {  
                        result.Append(arrChar[j]);  
                    }  
                    else  
                    {  
                        // Find the corresponding pinyin according to the coding range of Chinese characters and save it to the result     
                        // because charCode There's no need for the key to exist , So we're going to find a smaller key than him and put on a key    
                        if (!CodeCollections.ContainsKey(charCode))  
                        {  
                            for (int i = charCode; i <= 0; --i)  
                            {  
                                if (CodeCollections.ContainsKey(i))  
                                {  
                                    result.Append(" " + CodeCollections[i] + " ");  
                                    break;  
                                }  
                            }  
                        }  
                        else  
                        {  
                            result.Append(" " + CodeCollections[charCode] + " ");  
                        }  
                    }  
                }  
                return result.ToString();  
            }  
        }  
[csharp] view plaincopyprint?public static class ChineseToPinYin 
        { 
            private static readonly Dictionary<int, string> CodeCollections = new Dictionary<int, string> { 
 { -20319, "a" }, { -20317, "ai" }, { -20304, "an" }, { -20295, "ang" }, { -20292, "ao" }, { -20283, "ba" }, { -20265, "bai" },  
{ -20257, "ban" }, { -20242, "bang" }, { -20230, "bao" }, { -20051, "bei" }, { -20036, "ben" }, { -20032, "beng" }, { -20026, "bi" } 
, { -20002, "bian" }, { -19990, "biao" }, { -19986, "bie" }, { -19982, "bin" }, { -19976, "bing" }, { -19805, "bo" },  
{ -19784, "bu" }, { -19775, "ca" }, { -19774, "cai" }, { -19763, "can" }, { -19756, "cang" }, { -19751, "cao" }, { -19746, "ce" }, 
 { -19741, "ceng" }, { -19739, "cha" }, { -19728, "chai" }, { -19725, "chan" }, { -19715, "chang" }, { -19540, "chao" },  
{ -19531, "che" }, { -19525, "chen" }, { -19515, "cheng" }, { -19500, "chi" }, { -19484, "chong" }, { -19479, "chou" },  
{ -19467, "chu" }, { -19289, "chuai" }, { -19288, "chuan" }, { -19281, "chuang" }, { -19275, "chui" }, { -19270, "chun" }, 
 { -19263, "chuo" }, { -19261, "ci" }, { -19249, "cong" }, { -19243, "cou" }, { -19242, "cu" }, { -19238, "cuan" },  
{ -19235, "cui" }, { -19227, "cun" }, { -19224, "cuo" }, { -19218, "da" }, { -19212, "dai" }, { -19038, "dan" }, { -19023, "dang" }, 
 { -19018, "dao" }, { -19006, "de" }, { -19003, "deng" }, { -18996, "di" }, { -18977, "dian" }, { -18961, "diao" }, { -18952, "die" } 
, { -18783, "ding" }, { -18774, "diu" }, { -18773, "dong" }, { -18763, "dou" }, { -18756, "du" }, { -18741, "duan" },  
{ -18735, "dui" }, { -18731, "dun" }, { -18722, "duo" }, { -18710, "e" }, { -18697, "en" }, { -18696, "er" }, { -18526, "fa" }, 
 { -18518, "fan" }, { -18501, "fang" }, { -18490, "fei" }, { -18478, "fen" }, { -18463, "feng" }, { -18448, "fo" }, { -18447, "fou" } 
, { -18446, "fu" }, { -18239, "ga" }, { -18237, "gai" }, { -18231, "gan" }, { -18220, "gang" }, { -18211, "gao" }, { -18201, "ge" }, 
 { -18184, "gei" }, { -18183, "gen" }, { -18181, "geng" }, { -18012, "gong" }, { -17997, "gou" }, { -17988, "gu" }, { -17970, "gua" } 
, { -17964, "guai" }, { -17961, "guan" }, { -17950, "guang" }, { -17947, "gui" }, { -17931, "gun" }, { -17928, "guo" }, 
{ -17922, "ha" }, { -17759, "hai" }, { -17752, "han" }, { -17733, "hang" }, { -17730, "hao" }, { -17721, "he" }, { -17703, "hei" }, 
 { -17701, "hen" }, { -17697, "heng" }, { -17692, "hong" }, { -17683, "hou" }, { -17676, "hu" }, { -17496, "hua" },  
{ -17487, "huai" }, { -17482, "huan" }, { -17468, "huang" }, { -17454, "hui" }, { -17433, "hun" }, { -17427, "huo" },  
{ -17417, "ji" }, { -17202, "jia" }, { -17185, "jian" }, { -16983, "jiang" }, { -16970, "jiao" }, { -16942, "jie" },  
{ -16915, "jin" }, { -16733, "jing" }, { -16708, "jiong" }, { -16706, "jiu" }, { -16689, "ju" }, { -16664, "juan" },  
{ -16657, "jue" }, { -16647, "jun" }, { -16474, "ka" }, { -16470, "kai" }, { -16465, "kan" }, { -16459, "kang" }, { -16452, "kao" }, 
 { -16448, "ke" }, { -16433, "ken" }, { -16429, "keng" }, { -16427, "kong" }, { -16423, "kou" }, { -16419, "ku" }, { -16412, "kua" } 
, { -16407, "kuai" }, { -16403, "kuan" }, { -16401, "kuang" }, { -16393, "kui" }, { -16220, "kun" }, { -16216, "kuo" },  
{ -16212, "la" }, { -16205, "lai" }, { -16202, "lan" }, { -16187, "lang" }, { -16180, "lao" }, { -16171, "le" }, { -16169, "lei" },  
{ -16158, "leng" }, { -16155, "li" }, { -15959, "lia" }, { -15958, "lian" }, { -15944, "liang" }, { -15933, "liao" },  
{ -15920, "lie" }, { -15915, "lin" }, { -15903, "ling" }, { -15889, "liu" }, { -15878, "long" }, { -15707, "lou" }, { -15701, "lu" }, 
 { -15681, "lv" }, { -15667, "luan" }, { -15661, "lue" }, { -15659, "lun" }, { -15652, "luo" }, { -15640, "ma" }, { -15631, "mai" }, 
 { -15625, "man" }, { -15454, "mang" }, { -15448, "mao" }, { -15436, "me" }, { -15435, "mei" }, { -15419, "men" },  
{ -15416, "meng" }, { -15408, "mi" }, { -15394, "mian" }, { -15385, "miao" }, { -15377, "mie" }, { -15375, "min" },  
{ -15369, "ming" }, { -15363, "miu" }, { -15362, "mo" }, { -15183, "mou" }, { -15180, "mu" }, { -15165, "na" }, { -15158, "nai" },  
{ -15153, "nan" }, { -15150, "nang" }, { -15149, "nao" }, { -15144, "ne" }, { -15143, "nei" }, { -15141, "nen" }, { -15140, "neng" } 
, { -15139, "ni" }, { -15128, "nian" }, { -15121, "niang" }, { -15119, "niao" }, { -15117, "nie" }, { -15110, "nin" },  
{ -15109, "ning" }, { -14941, "niu" }, { -14937, "nong" }, { -14933, "nu" }, { -14930, "nv" }, { -14929, "nuan" }, { -14928, "nue" } 
, { -14926, "nuo" }, { -14922, "o" }, { -14921, "ou" }, { -14914, "pa" }, { -14908, "pai" }, { -14902, "pan" }, { -14894, "pang" }, 
 { -14889, "pao" }, { -14882, "pei" }, { -14873, "pen" }, { -14871, "peng" }, { -14857, "pi" }, { -14678, "pian" },  
{ -14674, "piao" }, { -14670, "pie" }, { -14668, "pin" }, { -14663, "ping" }, { -14654, "po" }, { -14645, "pu" }, { -14630, "qi" }, 
 { -14594, "qia" }, { -14429, "qian" }, { -14407, "qiang" }, { -14399, "qiao" }, { -14384, "qie" }, { -14379, "qin" }, 
 { -14368, "qing" }, { -14355, "qiong" }, { -14353, "qiu" }, { -14345, "qu" }, { -14170, "quan" }, { -14159, "que" },  
{ -14151, "qun" }, { -14149, "ran" }, { -14145, "rang" }, { -14140, "rao" }, { -14137, "re" }, { -14135, "ren" }, { -14125, "reng" } 
, { -14123, "ri" }, { -14122, "rong" }, { -14112, "rou" }, { -14109, "ru" }, { -14099, "ruan" }, { -14097, "rui" }, { -14094, "run" } 
, { -14092, "ruo" }, { -14090, "sa" }, { -14087, "sai" }, { -14083, "san" }, { -13917, "sang" }, { -13914, "sao" }, { -13910, "se" } 
, { -13907, "sen" }, { -13906, "seng" }, { -13905, "sha" }, { -13896, "shai" }, { -13894, "shan" }, { -13878, "shang" },  
{ -13870, "shao" }, { -13859, "she" }, { -13847, "shen" }, { -13831, "sheng" }, { -13658, "shi" }, { -13611, "shou" }, 
 { -13601, "shu" }, { -13406, "shua" }, { -13404, "shuai" }, { -13400, "shuan" }, { -13398, "shuang" }, { -13395, "shui" }, 
 { -13391, "shun" }, { -13387, "shuo" }, { -13383, "si" }, { -13367, "song" }, { -13359, "sou" }, { -13356, "su" },  
{ -13343, "suan" }, { -13340, "sui" }, { -13329, "sun" }, { -13326, "suo" }, { -13318, "ta" }, { -13147, "tai" }, { -13138, "tan" }, 
 { -13120, "tang" }, { -13107, "tao" }, { -13096, "te" }, { -13095, "teng" }, { -13091, "ti" }, { -13076, "tian" },  
{ -13068, "tiao" }, { -13063, "tie" }, { -13060, "ting" }, { -12888, "tong" }, { -12875, "tou" }, { -12871, "tu" },  
{ -12860, "tuan" }, { -12858, "tui" }, { -12852, "tun" }, { -12849, "tuo" }, { -12838, "wa" }, { -12831, "wai" }, { -12829, "wan" } 
, { -12812, "wang" }, { -12802, "wei" }, { -12607, "wen" }, { -12597, "weng" }, { -12594, "wo" }, { -12585, "wu" }, { -12556, "xi" } 
, { -12359, "xia" }, { -12346, "xian" }, { -12320, "xiang" }, { -12300, "xiao" }, { -12120, "xie" }, { -12099, "xin" },  
{ -12089, "xing" }, { -12074, "xiong" }, { -12067, "xiu" }, { -12058, "xu" }, { -12039, "xuan" }, { -11867, "xue" },  
{ -11861, "xun" }, { -11847, "ya" }, { -11831, "yan" }, { -11798, "yang" }, { -11781, "yao" }, { -11604, "ye" }, { -11589, "yi" }, 
 { -11536, "yin" }, { -11358, "ying" }, { -11340, "yo" }, { -11339, "yong" }, { -11324, "you" }, { -11303, "yu" },  
{ -11097, "yuan" }, { -11077, "yue" }, { -11067, "yun" }, { -11055, "za" }, { -11052, "zai" }, { -11045, "zan" }, 
 { -11041, "zang" }, { -11038, "zao" }, { -11024, "ze" }, { -11020, "zei" }, { -11019, "zen" }, { -11018, "zeng" },  
{ -11014, "zha" }, { -10838, "zhai" }, { -10832, "zhan" }, { -10815, "zhang" }, { -10800, "zhao" }, { -10790, "zhe" },  
{ -10780, "zhen" }, { -10764, "zheng" }, { -10587, "zhi" }, { -10544, "zhong" }, { -10533, "zhou" }, { -10519, "zhu" },  
{ -10331, "zhua" }, { -10329, "zhuai" }, { -10328, "zhuan" }, { -10322, "zhuang" }, { -10315, "zhui" }, { -10309, "zhun" },  
{ -10307, "zhuo" }, { -10296, "zi" }, { -10281, "zong" }, { -10274, "zou" }, { -10270, "zu" }, { -10262, "zuan" }, { -10260, "zui" } 
, { -10256, "zun" }, { -10254, "zuo" } }; 
            ///   <summary>   
            ///   Chinese character to Pinyin    
            ///   </summary>   
            ///   <param   name="txt"> Chinese characters that need to be converted </param>   
            ///   <returns> Return the Pinyin corresponding to Chinese characters </returns>   
            public static string ToPinYin(string txt) 
            { 
                txt = txt.Trim(); 
                byte[] arr = new byte[2];   // Each Chinese character is 2 byte    
                StringBuilder result = new StringBuilder();// Use StringBuilder Optimize string connection   
                int charCode = 0; 
                int arr1 = 0; 
                int arr2 = 0; 
                char[] arrChar = txt.ToCharArray(); 
                for (int j = 0; j < arrChar.Length; j++)   // Traverse the input character    
                { 
                    arr = System.Text.Encoding.Default.GetBytes(arrChar[j].ToString());// Get bytecode according to system default encoding    
                    if (arr.Length == 1)// If only 1 The byte indicates that the character is not a Chinese character , End this cycle    
                    { 
                        result.Append(arrChar[j].ToString()); 
                        continue; 
 
                    } 
                    arr1 = (short)(arr[0]);   // Take bytes 1   
                    arr2 = (short)(arr[1]);   // Take bytes 2   
                    charCode = arr1 * 256 + arr2 - 65536;// Calculate the coding of Chinese characters    
 
                     if (charCode > -10254 || charCode < -20319)  // If it is not in the range of Chinese character coding, it will not be changed    
                    { 
                        result.Append(arrChar[j]); 
                    } 
                    else 
                    { 
                        // Find the corresponding pinyin according to the coding range of Chinese characters and save it to the result    
                        // because charCode There's no need for the key to exist , So we're going to find a smaller key than him and put on a key   
                        if (!CodeCollections.ContainsKey(charCode)) 
                        { 
                            for (int i = charCode; i <= 0; --i) 
                            { 
                                if (CodeCollections.ContainsKey(i)) 
                                { 
                                    result.Append(" " + CodeCollections[i] + " "); 
                                    break; 
                                } 
                            } 
                        } 
                        else 
                        { 
                            result.Append(" " + CodeCollections[charCode] + " "); 
                        } 
                    } 
                } 
                return result.ToString(); 
            } 
        }

public static class ChineseToPinYin
  {
   private static readonly Dictionary<int, string> CodeCollections = new Dictionary<int, string> {
 { -20319, "a" }, { -20317, "ai" }, { -20304, "an" }, { -20295, "ang" }, { -20292, "ao" }, { -20283, "ba" }, { -20265, "bai" },
{ -20257, "ban" }, { -20242, "bang" }, { -20230, "bao" }, { -20051, "bei" }, { -20036, "ben" }, { -20032, "beng" }, { -20026, "bi" }
, { -20002, "bian" }, { -19990, "biao" }, { -19986, "bie" }, { -19982, "bin" }, { -19976, "bing" }, { -19805, "bo" },
{ -19784, "bu" }, { -19775, "ca" }, { -19774, "cai" }, { -19763, "can" }, { -19756, "cang" }, { -19751, "cao" }, { -19746, "ce" },
 { -19741, "ceng" }, { -19739, "cha" }, { -19728, "chai" }, { -19725, "chan" }, { -19715, "chang" }, { -19540, "chao" },
{ -19531, "che" }, { -19525, "chen" }, { -19515, "cheng" }, { -19500, "chi" }, { -19484, "chong" }, { -19479, "chou" },
{ -19467, "chu" }, { -19289, "chuai" }, { -19288, "chuan" }, { -19281, "chuang" }, { -19275, "chui" }, { -19270, "chun" },
 { -19263, "chuo" }, { -19261, "ci" }, { -19249, "cong" }, { -19243, "cou" }, { -19242, "cu" }, { -19238, "cuan" },
{ -19235, "cui" }, { -19227, "cun" }, { -19224, "cuo" }, { -19218, "da" }, { -19212, "dai" }, { -19038, "dan" }, { -19023, "dang" },
 { -19018, "dao" }, { -19006, "de" }, { -19003, "deng" }, { -18996, "di" }, { -18977, "dian" }, { -18961, "diao" }, { -18952, "die" }
, { -18783, "ding" }, { -18774, "diu" }, { -18773, "dong" }, { -18763, "dou" }, { -18756, "du" }, { -18741, "duan" },
{ -18735, "dui" }, { -18731, "dun" }, { -18722, "duo" }, { -18710, "e" }, { -18697, "en" }, { -18696, "er" }, { -18526, "fa" },
 { -18518, "fan" }, { -18501, "fang" }, { -18490, "fei" }, { -18478, "fen" }, { -18463, "feng" }, { -18448, "fo" }, { -18447, "fou" }
, { -18446, "fu" }, { -18239, "ga" }, { -18237, "gai" }, { -18231, "gan" }, { -18220, "gang" }, { -18211, "gao" }, { -18201, "ge" },
 { -18184, "gei" }, { -18183, "gen" }, { -18181, "geng" }, { -18012, "gong" }, { -17997, "gou" }, { -17988, "gu" }, { -17970, "gua" }
, { -17964, "guai" }, { -17961, "guan" }, { -17950, "guang" }, { -17947, "gui" }, { -17931, "gun" }, { -17928, "guo" },
{ -17922, "ha" }, { -17759, "hai" }, { -17752, "han" }, { -17733, "hang" }, { -17730, "hao" }, { -17721, "he" }, { -17703, "hei" },
 { -17701, "hen" }, { -17697, "heng" }, { -17692, "hong" }, { -17683, "hou" }, { -17676, "hu" }, { -17496, "hua" },
{ -17487, "huai" }, { -17482, "huan" }, { -17468, "huang" }, { -17454, "hui" }, { -17433, "hun" }, { -17427, "huo" },
{ -17417, "ji" }, { -17202, "jia" }, { -17185, "jian" }, { -16983, "jiang" }, { -16970, "jiao" }, { -16942, "jie" },
{ -16915, "jin" }, { -16733, "jing" }, { -16708, "jiong" }, { -16706, "jiu" }, { -16689, "ju" }, { -16664, "juan" },
{ -16657, "jue" }, { -16647, "jun" }, { -16474, "ka" }, { -16470, "kai" }, { -16465, "kan" }, { -16459, "kang" }, { -16452, "kao" },
 { -16448, "ke" }, { -16433, "ken" }, { -16429, "keng" }, { -16427, "kong" }, { -16423, "kou" }, { -16419, "ku" }, { -16412, "kua" }
, { -16407, "kuai" }, { -16403, "kuan" }, { -16401, "kuang" }, { -16393, "kui" }, { -16220, "kun" }, { -16216, "kuo" },
{ -16212, "la" }, { -16205, "lai" }, { -16202, "lan" }, { -16187, "lang" }, { -16180, "lao" }, { -16171, "le" }, { -16169, "lei" },
{ -16158, "leng" }, { -16155, "li" }, { -15959, "lia" }, { -15958, "lian" }, { -15944, "liang" }, { -15933, "liao" },
{ -15920, "lie" }, { -15915, "lin" }, { -15903, "ling" }, { -15889, "liu" }, { -15878, "long" }, { -15707, "lou" }, { -15701, "lu" },
 { -15681, "lv" }, { -15667, "luan" }, { -15661, "lue" }, { -15659, "lun" }, { -15652, "luo" }, { -15640, "ma" }, { -15631, "mai" },
 { -15625, "man" }, { -15454, "mang" }, { -15448, "mao" }, { -15436, "me" }, { -15435, "mei" }, { -15419, "men" },
{ -15416, "meng" }, { -15408, "mi" }, { -15394, "mian" }, { -15385, "miao" }, { -15377, "mie" }, { -15375, "min" },
{ -15369, "ming" }, { -15363, "miu" }, { -15362, "mo" }, { -15183, "mou" }, { -15180, "mu" }, { -15165, "na" }, { -15158, "nai" },
{ -15153, "nan" }, { -15150, "nang" }, { -15149, "nao" }, { -15144, "ne" }, { -15143, "nei" }, { -15141, "nen" }, { -15140, "neng" }
, { -15139, "ni" }, { -15128, "nian" }, { -15121, "niang" }, { -15119, "niao" }, { -15117, "nie" }, { -15110, "nin" },
{ -15109, "ning" }, { -14941, "niu" }, { -14937, "nong" }, { -14933, "nu" }, { -14930, "nv" }, { -14929, "nuan" }, { -14928, "nue" }
, { -14926, "nuo" }, { -14922, "o" }, { -14921, "ou" }, { -14914, "pa" }, { -14908, "pai" }, { -14902, "pan" }, { -14894, "pang" },
 { -14889, "pao" }, { -14882, "pei" }, { -14873, "pen" }, { -14871, "peng" }, { -14857, "pi" }, { -14678, "pian" },
{ -14674, "piao" }, { -14670, "pie" }, { -14668, "pin" }, { -14663, "ping" }, { -14654, "po" }, { -14645, "pu" }, { -14630, "qi" },
 { -14594, "qia" }, { -14429, "qian" }, { -14407, "qiang" }, { -14399, "qiao" }, { -14384, "qie" }, { -14379, "qin" },
 { -14368, "qing" }, { -14355, "qiong" }, { -14353, "qiu" }, { -14345, "qu" }, { -14170, "quan" }, { -14159, "que" },
{ -14151, "qun" }, { -14149, "ran" }, { -14145, "rang" }, { -14140, "rao" }, { -14137, "re" }, { -14135, "ren" }, { -14125, "reng" }
, { -14123, "ri" }, { -14122, "rong" }, { -14112, "rou" }, { -14109, "ru" }, { -14099, "ruan" }, { -14097, "rui" }, { -14094, "run" }
, { -14092, "ruo" }, { -14090, "sa" }, { -14087, "sai" }, { -14083, "san" }, { -13917, "sang" }, { -13914, "sao" }, { -13910, "se" }
, { -13907, "sen" }, { -13906, "seng" }, { -13905, "sha" }, { -13896, "shai" }, { -13894, "shan" }, { -13878, "shang" },
{ -13870, "shao" }, { -13859, "she" }, { -13847, "shen" }, { -13831, "sheng" }, { -13658, "shi" }, { -13611, "shou" },
 { -13601, "shu" }, { -13406, "shua" }, { -13404, "shuai" }, { -13400, "shuan" }, { -13398, "shuang" }, { -13395, "shui" },
 { -13391, "shun" }, { -13387, "shuo" }, { -13383, "si" }, { -13367, "song" }, { -13359, "sou" }, { -13356, "su" },
{ -13343, "suan" }, { -13340, "sui" }, { -13329, "sun" }, { -13326, "suo" }, { -13318, "ta" }, { -13147, "tai" }, { -13138, "tan" },
 { -13120, "tang" }, { -13107, "tao" }, { -13096, "te" }, { -13095, "teng" }, { -13091, "ti" }, { -13076, "tian" },
{ -13068, "tiao" }, { -13063, "tie" }, { -13060, "ting" }, { -12888, "tong" }, { -12875, "tou" }, { -12871, "tu" },
{ -12860, "tuan" }, { -12858, "tui" }, { -12852, "tun" }, { -12849, "tuo" }, { -12838, "wa" }, { -12831, "wai" }, { -12829, "wan" }
, { -12812, "wang" }, { -12802, "wei" }, { -12607, "wen" }, { -12597, "weng" }, { -12594, "wo" }, { -12585, "wu" }, { -12556, "xi" }
, { -12359, "xia" }, { -12346, "xian" }, { -12320, "xiang" }, { -12300, "xiao" }, { -12120, "xie" }, { -12099, "xin" },
{ -12089, "xing" }, { -12074, "xiong" }, { -12067, "xiu" }, { -12058, "xu" }, { -12039, "xuan" }, { -11867, "xue" },
{ -11861, "xun" }, { -11847, "ya" }, { -11831, "yan" }, { -11798, "yang" }, { -11781, "yao" }, { -11604, "ye" }, { -11589, "yi" },
 { -11536, "yin" }, { -11358, "ying" }, { -11340, "yo" }, { -11339, "yong" }, { -11324, "you" }, { -11303, "yu" },
{ -11097, "yuan" }, { -11077, "yue" }, { -11067, "yun" }, { -11055, "za" }, { -11052, "zai" }, { -11045, "zan" },
 { -11041, "zang" }, { -11038, "zao" }, { -11024, "ze" }, { -11020, "zei" }, { -11019, "zen" }, { -11018, "zeng" },
{ -11014, "zha" }, { -10838, "zhai" }, { -10832, "zhan" }, { -10815, "zhang" }, { -10800, "zhao" }, { -10790, "zhe" },
{ -10780, "zhen" }, { -10764, "zheng" }, { -10587, "zhi" }, { -10544, "zhong" }, { -10533, "zhou" }, { -10519, "zhu" },
{ -10331, "zhua" }, { -10329, "zhuai" }, { -10328, "zhuan" }, { -10322, "zhuang" }, { -10315, "zhui" }, { -10309, "zhun" },
{ -10307, "zhuo" }, { -10296, "zi" }, { -10281, "zong" }, { -10274, "zou" }, { -10270, "zu" }, { -10262, "zuan" }, { -10260, "zui" }
, { -10256, "zun" }, { -10254, "zuo" } };
   ///   <summary>
   ///   Chinese character to Pinyin
   ///   </summary>
   ///   <param   name="txt"> Chinese characters that need to be converted </param>
   ///   <returns> Return the Pinyin corresponding to Chinese characters </returns>
   public static string ToPinYin(string txt)
   {
    txt = txt.Trim();
    byte[] arr = new byte[2];   // Each Chinese character is 2 byte
    StringBuilder result = new StringBuilder();// Use StringBuilder Optimize string connection
    int charCode = 0;
    int arr1 = 0;
    int arr2 = 0;
    char[] arrChar = txt.ToCharArray();
    for (int j = 0; j < arrChar.Length; j++)   // Traverse the input character
    {
     arr = System.Text.Encoding.Default.GetBytes(arrChar[j].ToString());// Get bytecode according to system default encoding
     if (arr.Length == 1)// If only 1 The byte indicates that the character is not a Chinese character , End this cycle
     {
      result.Append(arrChar[j].ToString());
      continue;

}
     arr1 = (short)(arr[0]);   // Take bytes 1
     arr2 = (short)(arr[1]);   // Take bytes 2
     charCode = arr1 * 256 + arr2 - 65536;// Calculate the coding of Chinese characters

if (charCode > -10254 || charCode < -20319)  // If it is not in the range of Chinese character coding, it will not be changed
     {
      result.Append(arrChar[j]);
     }
     else
     {
      // Find the corresponding pinyin according to the coding range of Chinese characters and save it to the result
      // because charCode There's no need for the key to exist , So we're going to find a smaller key than him and put on a key
      if (!CodeCollections.ContainsKey(charCode))
      {
       for (int i = charCode; i <= 0; --i)
       {
        if (CodeCollections.ContainsKey(i))
        {
         result.Append(" " + CodeCollections[i] + " ");
         break;
        }
       }
      }
      else
      {
       result.Append(" " + CodeCollections[charCode] + " ");
      }
     }
    }
    return result.ToString();
   }
  }

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