using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
namespace AutoSync
{
    public class NewDirectory
    {
        public static Dictionary<string,string> GetDirectories(string dirname)
        {
            Dictionary<string, string> dirs = new Dictionary<string, string>();
            string[] strDirs = Directory.GetDirectories(dirname);
            foreach (string str in strDirs)
            {
                string[] result = str.Split('\\');
                dirs.Add(result[result.Length-1], result[result.Length-1]);
            }
            return dirs;
        }
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace AutoSync
{
    enum SyncResult
    {
        Success,SourceDirNotExists,DestDirNotExists
    }
    class FloderSync
    {
        public int CreateDirCount = 0;
        public int CopyFileCount = 0;
        public List<string> Log = new List<string>();
        private void AddLog(string logtext)
        {
            if (Log.Count < 1000)
                Log.Add(System.DateTime.Now.ToString() + logtext);
            else if (Log.Count == 1000)
                Log.Add(System.DateTime.Now.ToString() + "  達(dá)到日志上限,不再追加");
        }
        public SyncResult StartSync(string sourcedir, string destdir)
        {
            //傳入目錄名保護(hù)
            sourcedir = sourcedir.Trim();
            destdir = destdir.Trim();
            //保證目錄最后一個(gè)字符不是斜杠
            if (sourcedir[sourcedir.Length - 1] == '\\')
                sourcedir = sourcedir.Remove(sourcedir.Length - 1);
            if (destdir[destdir.Length - 1] == '\\')
                destdir = destdir.Remove(destdir.Length - 1);
            //判斷目錄是否存在
            if (!Directory.Exists(sourcedir)) return SyncResult.SourceDirNotExists;
            if (!Directory.Exists(destdir)) return SyncResult.DestDirNotExists;

            //獲取源、目的目錄內(nèi)的目錄信息
            Dictionary<string, string> SDirInfo = new Dictionary<string, string>();
            Dictionary<string, string> DDirInfo = new Dictionary<string, string>();
            Dictionary<string, string> aa = new Dictionary<string, string>();
            SDirInfo = NewDirectory.GetDirectories(sourcedir);//獲取源目錄的目錄信息
            DDirInfo = NewDirectory.GetDirectories(destdir);//獲取目標(biāo)目錄的目錄信息
            //
            //      開始同步兩個(gè)目錄，但只先同步源目錄信息
            //------比較兩目錄中的子目錄信息---------------------
            foreach (KeyValuePair<string, string> kvp in SDirInfo) //在查找有無源目錄存在而在目標(biāo)目錄中不存在的目錄
            {
                if(!DDirInfo.ContainsKey(kvp.Key)) //如果目標(biāo)目錄中不存在目錄，則馬上建立
                {
                    string dirname=destdir + "\\" + kvp.Key;
                    Directory.CreateDirectory(dirname);
                    AddLog("  創(chuàng)建目錄：" + dirname);

                    CreateDirCount++;
                }
                //遞歸調(diào)用目錄同步函數(shù)，實(shí)現(xiàn)嵌套目錄一次性全同步
                StartSync(sourcedir + "\\" + kvp.Key, destdir + "\\" + kvp.Key);
            }
            //取得源目錄下所有文件的列表
            string[] SFiles = Directory.GetFiles(sourcedir);
            //string[] DFiles = Directory.GetFiles(destdir);
            //------比較兩目錄中的文件信息（本層目錄）--------------
            foreach (string sfilename in SFiles)
            {
                string dfilename = destdir+"\\"+Path.GetFileName(sfilename);
                if (File.Exists(dfilename)) //如果目的目錄中已經(jīng)存在同名文件，則比較其最后修改時(shí)間，取最新的為準(zhǔn)
                {
                    //取得源、目的目錄中同名文件的文件信息
                    FileInfo sfi = new FileInfo(sfilename);
                    FileInfo dfi = new FileInfo(dfilename);
                    //如果源文件大于目的文件修改時(shí)間5秒以上才拷貝覆蓋過去，主要是考慮到操作系統(tǒng)的一些差異，對于修改時(shí)間相同而文件大小不同的文件則暫不處理
                    if (sfi.LastWriteTime > dfi.LastWriteTime.AddSeconds(5))
                    {
                        //拷貝源目錄下的同名文件到目的目錄
                        File.Copy(sfilename, dfilename, true);
                        AddLog("  覆蓋文件：" + dfilename);
                        CopyFileCount++;
                    }
                }
                else //如果目的目錄中不存在同名文件，則拷貝過去
                {
                    //拷貝源目錄下的同名文件到目的目錄
                    File.Copy(sfilename, dfilename, true);
                    AddLog("  拷貝文件：" + dfilename);
                    CopyFileCount++;
                }
            }
            return SyncResult.Success;
        }
    }
}