C#數字日期轉成中文日期

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入一個日期：");
            string strDate = Console.ReadLine();
            string dc = Baodate2Chinese(strDate);
            Console.WriteLine(dc);
        }

        private static string Baodate2Chinese(string strDate)
        {
            char[] strChinese= new char[] {
                 '〇','一','二','三','四','五','六','七','八','九','十'
             };
            StringBuilder result = new StringBuilder();

            //// 依據正則表達式判斷參數是否正確
            //Regex theReg = new Regex(@"(d{2}|d{4})(/|-)(d{1,2})(/|-)(d{1,2})");

            if (!string.IsNullOrEmpty(strDate))
            {
                // 將數字日期的年月日存到字符數組str中
                string[] str = null;
                if (strDate.Contains("-"))
                {
                    str = strDate.Split('-');
                }
                else if (strDate.Contains("/"))
                {
                    str = strDate.Split('/');
                }
                // str[0]中為年，將其各個字符轉換為相應的漢字
                for (int i = 0; i < str[0].Length; i++)
                {
                    result.Append(strChinese[int.Parse(str[0][i].ToString())]);
                }
                result.Append("年");

                // 轉換月
                int month = int.Parse(str[1]);
                int MN1 = month / 10;
                int MN2 = month % 10;

                if (MN1 > 1)
                {
                    result.Append(strChinese[MN1]);
                }
                if (MN1 > 0)
                {
                    result.Append(strChinese[10]);
                }
                if (MN2 != 0)
                {
                    result.Append(strChinese[MN2]);
                }
                result.Append("月");

                // 轉換日
                int day = int.Parse(str[2]);
                int DN1 = day / 10;
                int DN2 = day % 10;

                if (DN1 > 1)
                {
                    result.Append(strChinese[DN1]);
                }
                if (DN1 > 0)
                {
                    result.Append(strChinese[10]);
                }
                if (DN2 != 0)
                {
                    result.Append(strChinese[DN2]);
                }
                result.Append("日");
            }
            else
            {
                throw new ArgumentException();
            }

            return result.ToString();
        }
    }
}