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() + "  达到日志上限,不再追加");
        }
        public SyncResult StartSync(string sourcedir, string destdir)
        {
            //传入目录名保护
            sourcedir = sourcedir.Trim();
            destdir = destdir.Trim();
            //保证目录最后一个字符不是斜杠
            if (sourcedir[sourcedir.Length - 1] == '\\')
                sourcedir = sourcedir.Remove(sourcedir.Length - 1);
            if (destdir[destdir.Length - 1] == '\\')
                destdir = destdir.Remove(destdir.Length - 1);
            //判断目录是否存在
            if (!Directory.Exists(sourcedir)) return SyncResult.SourceDirNotExists;
            if (!Directory.Exists(destdir)) return SyncResult.DestDirNotExists;

            //获取源、目的目录内的目录信息
            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);//获取源目录的目录信息
            DDirInfo = NewDirectory.GetDirectories(destdir);//获取目标目录的目录信息
            //
            //      开始同步两个目录，但只先同步源目录信息
            //------比较两目录中的子目录信息---------------------
            foreach (KeyValuePair<string, string> kvp in SDirInfo) //在查找有无源目录存在而在目标目录中不存在的目录
            {
                if(!DDirInfo.ContainsKey(kvp.Key)) //如果目标目录中不存在目录，则马上建立
                {
                    string dirname=destdir + "\\" + kvp.Key;
                    Directory.CreateDirectory(dirname);
                    AddLog("  创建目录：" + dirname);

                    CreateDirCount++;
                }
                //递归调用目录同步函数，实现嵌套目录一次性全同步
                StartSync(sourcedir + "\\" + kvp.Key, destdir + "\\" + kvp.Key);
            }
            //取得源目录下所有文件的列表
            string[] SFiles = Directory.GetFiles(sourcedir);
            //string[] DFiles = Directory.GetFiles(destdir);
            //------比较两目录中的文件信息（本层目录）--------------
            foreach (string sfilename in SFiles)
            {
                string dfilename = destdir+"\\"+Path.GetFileName(sfilename);
                if (File.Exists(dfilename)) //如果目的目录中已经存在同名文件，则比较其最后修改时间，取最新的为准
                {
                    //取得源、目的目录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时间5秒以上才拷贝覆盖过去，主要是考虑到操作系统的一些差异，对于修改时间相同而文件大小不同的文件则暂不处理
                    if (sfi.LastWriteTime > dfi.LastWriteTime.AddSeconds(5))
                    {
                        //拷贝源目录下的同名文件到目的目录
                        File.Copy(sfilename, dfilename, true);
                        AddLog("  覆盖文件：" + dfilename);
                        CopyFileCount++;
                    }
                }
                else //如果目的目录中不存在同名文件，则拷贝过去
                {
                    //拷贝源目录下的同名文件到目的目录
                    File.Copy(sfilename, dfilename, true);
                    AddLog("  拷贝文件：" + dfilename);
                    CopyFileCount++;
                }
            }
            return SyncResult.Success;
        }
    }
}