获得字符串的某些词

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 字符串练习
{
    class Program
    {
        static void Main(string[] args)
        {
            
            t2();


        }


        #region t1 //


        public static void t1()
        {
            Console.WriteLine("输入一个字符串，马上就给你反转过来");
            string input = Console.ReadLine();
            string[] wds = input.Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < wds.Length; i++)
            {
                wds[i] = ResStr(wds[i]);

            }
            string rs = string.Join(" ", wds);
            Console.WriteLine(rs);
            Console.ReadKey();
        }
        #endregion

public static void t2()
{
    string str = "今天是201年34月34日";
    int yearIndex = str.IndexOf("年");//字符串从0开始计数，yearIndex为6
    int getStartIndex = GetStart(str, yearIndex);
    int mouthIndex = str.IndexOf("月");
    int dayIndex = str.IndexOf("日");
    string yStr = str.Substring(getStartIndex+1, yearIndex-getStartIndex-1);
    string mStr = str.Substring(yearIndex+1, mouthIndex - yearIndex - 1);
    string dStr = str.Substring(mouthIndex+1, dayIndex - mouthIndex - 1);
    Console.WriteLine(yStr);
    Console.WriteLine(mStr);
   Console.WriteLine(dStr);
    Console.ReadKey();
}

 public static void t3()//读出csv文件内容
        {
            string[] str = File.ReadAllLines("t.csv",Encoding.Default);
            for (int i = 0; i < str.Length; i++)
            {
                string[] juti = str[i].Split(',');
                Console.WriteLine("姓名{0}；电话{1}",juti);//标准流，所以不需要使用juti[0],juti[1]这样的形式
               
            }
            Console.ReadKey();
        }
        private static string ResStr(string input)
        {
            char[] wd = input.ToCharArray();
            for (int i = 0; i < wd.Length/2; i++)
            {
                char temp = wd[i];
                wd[i] = wd[wd.Length - i-1];
                wd[wd.Length - i - 1] = temp;
               
            }
            return  new string(wd);

        }
        //获得起始位置下标
        private static int GetStart(string str,int yearIndex)
        {
            for (int i = yearIndex; i >=0; i--)
            {

                if (!char.IsDigit(str[i]))//判断是否为十进制数
                {
                    return i;
                }
            }
            return -1;
        }
    }
}