将数字转换成关键词

public static string NumberToWords(int number)

        {

            if (number == 0)

                return "zero";

 

            if (number < 0)

                return "minus " + NumberToWords(Math.Abs(number));

 

            string words = "";

 

            if ((number / 1000000) > 0)

            {

                words += NumberToWords(number / 1000000) + " million ";

                number %= 1000000;

            }

 

            if ((number / 1000) > 0)

            {

                words += NumberToWords(number / 1000) + " thousand ";

                number %= 1000;

            }

 

            if ((number / 100) > 0)

            {

                words += NumberToWords(number / 100) + " hundred ";

                number %= 100;

            }

 

            if (number > 0)

            {

                if (words != "")

                    words += "and ";

 

                var unitsMap = new[] { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };

                var tensMap = new[] { "zero", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety" };

 

                if (number < 20)

                    words += unitsMap[number];

                else

                {

                    words += tensMap[number / 10];

                    if ((number % 10) > 0)

                        words += "-" + unitsMap[number % 10];

                }

            }

 

            return words;

        }