.net中日期转为中文

    public class ConvertDateToChinese
    {
        private static ConvertDateToChinese instance = null;

        public static ConvertDateToChinese Instance
        {
            get
            {
                if (instance == null)
                {
                     instance=new ConvertDateToChinese();
                }

                return instance;
            }
        }

        public char[] chinese;

        private ConvertDateToChinese()
        {
            chinese = new char[] {'〇','一','二','三','四','五','六','七','八','九','十'};
        }

       //Method for Convert to Chinese
        public string ConvertMethod(string date)
        {
            // Define stringBuilder variable  for write out the chinese of date
            StringBuilder strb = new StringBuilder();

            //define regex regularExpressins variable
            Regex regex = new Regex(@"(\d{2}|\d{4})(-|/)(\d{1}|\d{2})(-|/)(\d{1}|\d{2})");
            if (regex.IsMatch(date))
            {
             string[] str=null;
             if (date.Contains("-"))
             {
                 str = date.Split('-');
             }
             else
             {
                 if(date.Contains("/"))
                 {
                     str=date.Split('/');

                 }
             }
             //Convert year as follow
             for (int i = 0; i < str[0].Length; i++)
             {
                 strb = strb.Append(chinese[int.Parse(str[0][i].ToString())]);
             }
             strb.Append("年");
              
                  //Convert month as follow
            // if (chinese[int.Parse(str[1][0].ToString())] != '0')
            // {
            //     strb.Append(chinese[int.Parse(str[1][0].ToString())]);
            // }
            // for (int i = 1; i < str[1].Length; i++)
            // {
            //     strb = strb.Append(chinese[int.Parse(str[1][i].ToString())]);
            // }
            // strb.Append("月");

            //        //Convert day as follow
            // if (chinese[int.Parse(str[2][0].ToString())] !='0')
            // {
            //     strb.Append(chinese[int.Parse(str[2][0].ToString())]);
            // }
            // for (int i = 1; i < str[2].Length; i++)
            // {
            //     strb = strb.Append(chinese[int.Parse(str[2][i].ToString())]);
            // }
             // strb.Append("日");
             #region  //convert month
             int monthod = int.Parse(str[1]);
                int MN1 = monthod / 10;
                int MN2 = monthod % 10;


                if (MN1 > 0)
                {
                    strb.Append(chinese[10]);
                }
                if (MN2 != 0)
                {
                    strb.Append(chinese[MN2]);
                }
 
　　　　　　　　 strb.Append("月");

             #endregion
             #region //convert day
                int day = int.Parse(str[2]);
                int day1 = day / 10;
                int day2 = day % 10;

                if (day1 > 1)
                {
                    strb.Append(chinese[day1]);
                   
                    
                }
                if (day1 > 0)
                {
                    strb.Append(chinese[10]);
                }
                if (day2 > 0)
                {
                    strb.Append(chinese[day2]);
                }

 　　　　　　　　 strb.Append("日");

                #endregion


            }
               
            else
            {
                throw new ArgumentException();
               
            }
            
            return strb.ToString(); 

        }
    }