C# 根據時間獲取目錄及文件

實際開發中遇到的問題，記錄下來以便以后查看

業務：每天自動生成一個目錄，在按日期生成的目錄中會生成N個子目錄，

         子目錄中會生成一至兩個文件，先在需要取到子目錄中的文件 

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MULUTEST
{
    class Program
    {
        //返回文件列表 
        private static List<String>  filelist;
        private static int fileDirJB=2;

        static void Main(string[] args)
        {
            string dir = "E:\\mulutest";
            Console.WriteLine("當前目錄:" + dir);
            try
            {
                List<String> datelist = getDateDir();
                if (datelist != null && datelist.Count > 0) 
                {   filelist=new List<string>();
                    foreach (string datemulu in datelist)
                    {
                        Console.WriteLine("檢查日期" + datemulu + "的目錄");
                        string mulu = dir + "\\" + datemulu;                        
                        ListFiles(new DirectoryInfo(mulu),"",1);
                    }                  
                }

                Console.WriteLine("最終文件:");
                foreach (string filename in filelist) {
                    Console.WriteLine(filename);
                }
                Console.ReadLine();
            }
            catch (IOException e)
            {
                Console.WriteLine(e.Message);
            } 
        }

        #region 按時間 獲取文件夾名稱
        public static List<String> getDateDir() 
        {
            DateTime testdaay = Convert.ToDateTime("2015-03-11");
            Console.WriteLine("最后生成時間：" + testdaay.ToString("yyyyMMdd"));
            DateTime dt = DateTime.Today;
            Console.WriteLine("今天：" + dt.ToString("yyyyMMdd"));
            List<String> datelist = new List<string>();

            while (DateTime.Compare(dt, testdaay) > 0)
            {
                testdaay = testdaay.AddDays(1);
                datelist.Add(testdaay.ToString("yyyyMMdd"));
            }
            return datelist;
        }
        #endregion

        public static void ListFiles(FileSystemInfo info, string fjinfo,int mulujb)
        {
            if (fjinfo != null && !fjinfo.Equals(""))
            {
                Console.WriteLine("開始查找目錄：" + fjinfo + "\\" + info.ToString());
            }
            else {
                Console.WriteLine("開始查找目錄："  + info.ToString());
            }

            if (!info.Exists) {
                Console.WriteLine("不存在目錄："+info.ToString());
                return;
            }

            DirectoryInfo dir = info as DirectoryInfo;
            //不是目錄 
            if (dir == null) {
                Console.WriteLine("不是目錄: "+info.ToString());
                return;
            } 

            FileSystemInfo[] files = dir.GetFileSystemInfos();
            for (int i = 0; i < files.Length; i++)
            {
                FileInfo file = files[i] as FileInfo;
                //是文件 
                if (file != null)
                {
                    if (mulujb == fileDirJB)
                    {
                        filelist.Add(file.FullName);
                        Console.WriteLine("找到合法文件：" + file.FullName);
                    }
                    else {
                        Console.WriteLine("找到文件：" + file.FullName+" 不合法 ，忽略");
                    }                 
                }
                //對於子目錄，進行遞歸調用 
                else
                {
                    int jib = mulujb + 1;
                    ListFiles(files[i], info.ToString(),jib);
                }

            }
        } 
    }
}