?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace 同步文件監視測試
{
??? class Program
??? {
???????
??????? static string a = @"C:\Users\dell\Desktop\123";
??????? static string d = @"C:\Users\dell\Desktop\備份";
??????? //static string d = @"D:\備份";
??????? static DirectoryInfo fbeifen;
??????? static DirectoryInfo f123 = new DirectoryInfo(a);
??????? static? StreamReader rain;//不能放于循環體多次創建，要記住啊！！！
??????? static? StreamWriter saout;
??????? static? StringBuilder fff = new StringBuilder("");
??????? static FileSystemWatcher w;
??????? static void Main(string[] args)
??????? {
???????????
??????????? w = new FileSystemWatcher(a);
??????????? w.Changed += new FileSystemEventHandler(w_Changed);
??????????? //w.NotifyFilter = NotifyFilters.CreationTime | NotifyFilters.LastWrite | NotifyFilters.FileName;
??????????? w.EnableRaisingEvents = true;
??????????? Console.Read();
??????? }
??????? static void w_Changed(object sender, FileSystemEventArgs e)
??????? {
??????????? //此處可避免同時執行兩次
??????????? w.EnableRaisingEvents = false;
??????????? System.Threading.Thread.Sleep(1000);
??????????? w.EnableRaisingEvents = true;
??????????? fbeifen = new DirectoryInfo(d);//注意這里，不能只用一個對象
??????????? // 每次改變都會執行兩次不知到為什么
??????????????? if (!fbeifen.Exists)
??????????????? {
??????????????????? try
??????????????????? {
??????????????????????? fbeifen.Create();
??????????????????????? Console.WriteLine("開始創建備份時間" + DateTime.Now.Ticks.ToString());
??????????????????????? foreach (var item in f123.GetFiles())
??????????????????????? {
??????????????????????????? rain = new StreamReader(item.DirectoryName + @"\" + item.Name,Encoding.GetEncoding("gb2312"));
??????????????????????????? File.Create(d + @"\" + item.Name).Close();
??????????????????????????? saout = File.AppendText(d + @"\" + item.Name);
??????????????????????????? saout.Write(rain.ReadToEnd());
??????????????????????????? rain.Close();
??????????????????????????? saout.Close();
??????????????????????????? //System.Threading.Thread.Sleep(100);
??????????????????????? }
??????????????????????? Console.WriteLine("創建備份成功！");
??????????????????? }
??????????????????? catch (Exception ex)
??????????????????? {
??????????????????????? Console.WriteLine("創建備份失敗！" + ex.Message);
??????????????????? }

??????????????? }
??????????????? else
??????????????? {
??????????????????? try
??????????????????? {
??????????????????????? rain = new StreamReader(a + @"\" + e.Name,Encoding.GetEncoding("gb2312"));
??????????????????????? File.Create(d + @"\" + e.Name).Close();
??????????????????????? saout = File.AppendText(d + @"\" + e.Name);
??????????????????????? saout.Write(rain.ReadToEnd());
??????????????????????? rain.Close();
??????????????????????? saout.Close();
??????????????????????? Console.WriteLine(e.Name + "---文件更新備份成功！");
??????????????????? }
??????????????????? catch (Exception ex)
??????????????????? { Console.WriteLine("文件更新備份失敗：" + ex.Message); }
??????????????? }
?
??????? }
??? }
}

c#同步備份文件夾文件（部分案例）