阿拉伯数字转中文数字

public class IntToSmallChineseNumber
    {
        public static String ToCH(int intInput)
        {
            string si = intInput.ToString();
            string sd = "";
            if (si.Length == 1) // 個
            {
                sd += GetCH(intInput);
                return sd;
            }
            else if (si.Length == 2)// 十
            {
                if (si.Substring(0, 1).Equals("1"))
                    sd += "十";
                else
                    sd += (GetCH(intInput / 10) + "十");
                sd += ToCH(intInput % 10);
            }
            else if (si.Length == 3)// 百
            {
                sd += (GetCH(intInput / 100) + "百");
                if ((intInput % 100).ToString().Length < 2)
                    sd += "零";
                sd += ToCH(intInput % 100);
            }
            else if (si.Length == 4)// 千
            {
                sd += (GetCH(intInput / 1000) + "千");
                if ((intInput % 1000).ToString().Length < 3)
                    sd += "零";
                sd += ToCH(intInput % 1000);
            }
            else if (si.Length == 5)// 萬
            {
                sd += (GetCH(intInput / 10000) + "万");
                if ((intInput % 10000).ToString().Length < 4)
                    sd += "零";
                sd += ToCH(intInput % 10000);
            }

            return sd;
        }

        private static String GetCH(int input)
        {
            String sd = "";
            switch (input)
            {
                case 1:
                    sd = "一";
                    break;
                case 2:
                    sd = "二";
                    break;
                case 3:
                    sd = "三";
                    break;
                case 4:
                    sd = "四";
                    break;
                case 5:
                    sd = "五";
                    break;
                case 6:
                    sd = "六";
                    break;
                case 7:
                    sd = "七";
                    break;
                case 8:
                    sd = "八";
                    break;
                case 9:
                    sd = "九";
                    break;
                default:
                    break;
            }
            return sd;
        }
    }