C#利用FileSystemWatcher对文件进行监控

1、打开VS，选择Visual C#模板创建WPF应用程序。输入名称FileSystemWatcherTest，并指定其位置，点击确认按钮进入代码编写界面。

2、准备一个RichTextBox控件拖入到Form1界面中，点击右上角三角形，弹出RichTextBox任务，选择在父容器中停靠。该RichTextBox将用于监控外部记事本改变时显示改动后的内容。

3、添加一个名为MyWatcher的新类。可点击VS菜单项中的【项目】在其下拉菜单中找到【添加类】并点击，弹出添加新项窗口，在点击C#项中【类】，输入名称MyWatcher，点击【添加】按钮

4、在MyWatcher.cs页面中添加复制粘贴如下代码：using System;u衡痕贤伎sing System.Collections.Gen髫潋啜缅eric;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace FileSystemWatcherTest{ class MyWatcher { public MyWatcher(dynamic FormTest,string path) { this.FormTest = FormTest; this.Path = path; } private FileSystemWatcher watcher = null; private dynamic FormTest; internal string Path { set { //watcher.Path = value; WatcherStrat(value); } } private void WatcherStrat(string path) { if (watcher == null) { watcher = new FileSystemWatcher(); System.IO.FileInfo f = new FileInfo(path); watcher.Path = f.DirectoryName ; watcher.Changed += new FileSystemEventHandler(OnChanged); watcher.EnableRaisingEvents = true; watcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size; watcher.IncludeSubdirectories = true; watcher.Filter ="*"+ f.Extension; } else { System.IO.FileInfo f = new FileInfo(path); watcher.Path = f.FullName; watcher.Filter = "*" + f.Extension; } } private void OnChanged(object source, FileSystemEventArgs e) { FormTest.TxtChanged(watcher.Path + "\\" + e.Name); } }}

5、在Form1页面中添加复制粘贴如下代码：using System;using Sy衡痕贤伎stem.Collections.Generic;us足毂忍珩ing System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace FileSystemWatcherTest{ public partial class Form1 : Form { public Form1() { InitializeComponent(); MyWatcher mwatcher = new MyWatcher(this, "1.txt"); } public void TxtChanged(string path) { System.IO.StreamReader sr = new System.IO.StreamReader(path); string str = sr.ReadToEnd(); sr.Close(); RichTextBox1Text = str; } private delegate void RefleshUI(string s); private void Thread(string s)//UI线程要做的事情 { this.richTextBox1.Text = s; } public string RichTextBox1Text { set { this.richTextBox1.Invoke(new RefleshUI(Thread), value); } } }}

6、编译代码，生成解决方案。编译成功后，按F5执行。在生成目录下创建一个TXT文件，并修改其内容后保存，会发现richTextBox1中的内容发生了同样的变化。