最多两位小数,如123.45的转换结果为:壹百贰拾叁元肆角伍分

 /// <summary>
        /// public static string ToUpper(decimal d)：小写金额转换为大写金额，其他条件：金额小于一万亿，
        /// 最多两位小数,如123.45的转换结果为:壹百贰拾叁元肆角伍分
        /// </summary>
        /// <param name="d">源金额，d 《 1000000000000.00(一万亿)，且最多两位小数 </param>
        /// <returns>结果，大写金额</returns>
        public static string ToUpper(decimal d)
        {
            if (d == 0)
                return "零元整";

            string je = d.ToString("####.00");
            if (je.Length > 15)
                return "";
            je = new String('0', 15 - je.Length) + je;                        //若小于15位长，前面补0

            string stry = je.Substring(0, 4);                                //取得'亿'单元
            string strw = je.Substring(4, 4);                                //取得'万'单元
            string strg = je.Substring(8, 4);                                //取得'元'单元
            string strf = je.Substring(13, 2);                                //取得小数部分

            string str1 = "", str2 = "", str3 = "";

            str1 = getupper(stry, "亿");                                //亿单元的大写
            str2 = getupper(strw, "万");                                //万单元的大写
            str3 = getupper(strg, "元");                                //元单元的大写


            string str_y = "", str_w = "";
            if (je[3] == '0' || je[4] == '0')                                //亿和万之间是否有0
                str_y = "零";
            if (je[7] == '0' || je[8] == '0')                                //万和元之间是否有0
                str_w = "零";



            string ret = str1 + str_y + str2 + str_w + str3;                //亿，万，元的三个大写合并

            for (int i = 0; i < ret.Length; i++)                                //去掉前面的"零"            
            {
                if (ret[i] != '零')
                {
                    ret = ret.Substring(i);
                    break;
                }

            }
            for (int i = ret.Length - 1; i > -1; i--)                        //去掉最后的"零"    
            {
                if (ret[i] != '零')
                {
                    ret = ret.Substring(0, i + 1);
                    break;
                }
            }

            if (ret[ret.Length - 1] != '元')                                //若最后不位不是'元'，则加一个'元'字
                ret = ret + "元";

            if (ret == "零零元")                                            //若为零元，则去掉"元数"，结果只要小数部分
                ret = "";

            if (strf == "00")                                                //下面是小数部分的转换
            {
                ret = ret + "整";
            }
            else
            {
                string tmp = "";
                tmp = getint(strf[0]);
                if (tmp == "零")
                    ret = ret + tmp;
                else
                    ret = ret + tmp + "角";

                tmp = getint(strf[1]);
                if (tmp == "零")
                    ret = ret + "整";
                else
                    ret = ret + tmp + "分";
            }

            if (ret[0] == '零')
            {
                ret = ret.Substring(1);                                        //防止0.03转为"零叁分"，而直接转为"叁分"
            }

            return ret;                                                    //完成，返回


        }
        /// <summary>
        /// private static string getupper(string str,string strDW)：
        /// 把一个单元转为大写，如亿单元，万单元，个单元
        /// </summary>
        /// <param name="str">这个单元的小写数字（4位长，若不足，则前面补零）</param>
        /// <param name="strDW">亿，万，元</param>
        /// <returns>转换结果</returns>
        private static string getupper(string str, string strDW)
        {
            if (str == "0000")
                return "";

            string ret = "";
            string tmp1 = getint(str[0]);
            string tmp2 = getint(str[1]);
            string tmp3 = getint(str[2]);
            string tmp4 = getint(str[3]);
            if (tmp1 != "零")
            {
                ret = ret + tmp1 + "仟";
            }
            else
            {
                ret = ret + tmp1;
            }

            if (tmp2 != "零")
            {
                ret = ret + tmp2 + "佰";
            }
            else
            {
                if (tmp1 != "零")                                            //保证若有两个零'00'，结果只有一个零，下同
                    ret = ret + tmp2;
            }

            if (tmp3 != "零")
            {
                ret = ret + tmp3 + "拾";
            }
            else
            {
                if (tmp2 != "零")
                    ret = ret + tmp3;
            }

            if (tmp4 != "零")
            {
                ret = ret + tmp4;
            }

            if (ret[0] == '零')                                                //若第一个字符是'零'，则去掉
                ret = ret.Substring(1);
            if (ret[ret.Length - 1] == '零')                                //若最后一个字符是'零'，则去掉
                ret = ret.Substring(0, ret.Length - 1);

            return ret + strDW;                                                //加上本单元的单位

        }
        /// <summary>
        /// private static string getint(char c)：单个数字转为大写
        /// </summary>
        /// <param name="c">小写阿拉伯数字 0---9</param>
        /// <returns>大写数字</returns>
        private static string getint(char c)
        {
            string str = "";
            switch (c)
            {
                case '0':
                    str = "零";
                    break;
                case '1':
                    str = "壹";
                    break;
                case '2':
                    str = "贰";
                    break;
                case '3':
                    str = "叁";
                    break;
                case '4':
                    str = "肆";
                    break;
                case '5':
                    str = "伍";
                    break;
                case '6':
                    str = "陆";
                    break;
                case '7':
                    str = "柒";
                    break;
                case '8':
                    str = "捌";
                    break;
                case '9':
                    str = "玖";
                    break;
            }
            return str;
        }