安装相关依赖：NPinyin

　　　　　　   Microsoft.International.Converters.PinYinConverter

直接从vs里面的nuget管理器搜索下载即可。

C#汉字转拼音_首字母
    public class PinYinHelper
    {
        private static Encoding gb2312 = Encoding.GetEncoding("GB2312");

        /// <summary>
        /// 汉字转全拼
        /// </summary>
        public static string ConvertToAllSpell(string strChinese, IDictionary<char, string> pinyinDic = null)
        {
            try
            {
                if (strChinese.Length != 0)
                {
                    var fullSpell = new StringBuilder();
                    for (var i = 0; i < strChinese.Length; i++)
                    {
                        var chr = strChinese[i];
                        var pinyin = GetSpell(chr);
                        fullSpell.Append(pinyin);
                    }

                    return fullSpell.ToString().ToLower();
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("全拼转化出错！" + e.Message);
            }

            return string.Empty;
        }

        /// <summary>
        /// 汉字转首字母
        /// </summary>
        /// <param name="strChinese"></param>
        /// <returns></returns>
        public static string GetFirstSpell(string strChinese)
        {
            //NPinyin.Pinyin.GetInitials(strChinese)  有Bug  洺无法识别
            //return NPinyin.Pinyin.GetInitials(strChinese);

            try
            {
                if (strChinese.Length != 0)
                {
                    var fullSpell = new StringBuilder();
                    for (var i = 0; i < strChinese.Length; i++)
                    {
                        var chr = strChinese[i];
                        fullSpell.Append(GetSpell(chr)[0]);
                    }

                    return fullSpell.ToString().ToLower();
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("首字母转化出错！" + e.Message);
            }

            return string.Empty;
        }

        private static string GetSpell(char chr)
        {
            var coverchr = NPinyin.Pinyin.GetPinyin(chr);
            var isChineses = ChineseChar.IsValidChar(coverchr[0]);
            if (isChineses)
            {
                var chineseChar = new ChineseChar(coverchr[0]);
                foreach (var value in chineseChar.Pinyins)
                {
                    if (!string.IsNullOrEmpty(value))
                    {
                        return value.Remove(value.Length - 1, 1);
                    }
                }
            }

            return coverchr;

        }

        /// <summary>
        /// 从字典获取拼音
        /// </summary>
        /// <param name="c">字</param>
        /// <param name="pinyinDic">字典</param>
        /// <returns></returns>
        private static string GetFromPinYinDic(char c, IDictionary<char, string> pinyinDic)
        {
            if (pinyinDic == null
                || pinyinDic.Count == 0
                || !pinyinDic.ContainsKey(c))
            {
                return "";
            }

            return pinyinDic[c];
        }
    }
C#汉字转拼音_首字母