转自：C# 实现监控文件夹和里面文件的变化 - 秋天的林子 - 博客园 (cnblogs.com)
描述：
- FileSystemWatcher位于System.IO;
- 命名空间下面，想要使用它必须先引用System.IO;
下面的例子使用了FileSystemWatcher来监控C盘文件的变化，因为这个目录的变化是最频繁的，运行程序打开浏览器可以看到很频繁的临时文件创建，需要注意的是：
- 添加文件或文件夹时，会触发Created事件，然后修改默认文件夹或文件名称再触发Changed事件。
- 复制或移动文件夹文件时则是触发Created事件。
- 删除文件夹或文件时触发Deleted事件。
下面是整个例子的代码，可以建一个空的控制台应用程序复制粘贴就能运行了：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace HelloCsharp
{
class Program
{
static void Main(string[] args)
{
FileListenerServer f1 = new FileListenerServer(@"c:\");
f1.Start();
Console.ReadKey();
}
}
public class FileListenerServer
{
private FileSystemWatcher _watcher;
public FileListenerServer()
{
}
public FileListenerServer(string path)
{
try
{
this._watcher = new FileSystemWatcher();
_watcher.Path = path;
_watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.Size | NotifyFilters.DirectoryName;
_watcher.IncludeSubdirectories = true;
_watcher.Created += new FileSystemEventHandler(FileWatcher_Created);
_watcher.Changed += new FileSystemEventHandler(FileWatcher_Changed);
_watcher.Deleted += new FileSystemEventHandler(FileWatcher_Deleted);
_watcher.Renamed += new RenamedEventHandler(FileWatcher_Renamed);
}
catch (Exception ex)
{
Console.WriteLine("Error:" + ex.Message);
}
}
public void Start()
{
this._watcher.EnableRaisingEvents = true;
Console.WriteLine("文件监控已经启动...");
}
public void Stop()
{
this._watcher.EnableRaisingEvents = false;
this._watcher.Dispose();
this._watcher = null;
}
protected void FileWatcher_Created(object sender, FileSystemEventArgs e)
{
Console.WriteLine("新增:" + e.ChangeType + ";" + e.FullPath + ";" + e.Name);
}
protected void FileWatcher_Changed(object sender, FileSystemEventArgs e)
{
Console.WriteLine("变更:" + e.ChangeType + ";" + e.FullPath + ";" + e.Name);
}
protected void FileWatcher_Deleted(object sender, FileSystemEventArgs e)
{
Console.WriteLine("删除:" + e.ChangeType + ";" + e.FullPath + ";" + e.Name);
}
protected void FileWatcher_Renamed(object sender, RenamedEventArgs e)
{
Console.WriteLine("重命名: OldPath:{0} NewPath:{1} OldFileName{2} NewFileName:{3}", e.OldFullPath, e.FullPath, e.OldName, e.Name);
}
}
}
更改监听配置信息：
1 private static void WatcherStrat(string StrWarcherPath, string FilterType, bool IsEnableRaising, bool IsInclude) 2 { 3 //初始化监听 4 watcher.BeginInit(); 5 //设置监听文件类型 6 watcher.Filter = FilterType; 7 //设置是否监听子目录 8 watcher.IncludeSubdirectories = IsInclude; 9 //设置是否启用监听? 10 watcher.EnableRaisingEvents = IsEnableRaising; 11 //设置需要监听的更改类型(如:文件或者文件夹的属性,文件或者文件夹的创建时间;NotifyFilters枚举的内容) 12 watcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size; 13 //设置监听的路径 14 watcher.Path = StrWarcherPath; 15 //注册创建文件或目录时的监听事件 16 //watcher.Created += new FileSystemEventHandler(watch_created); 17 //注册当指定目录的文件或者目录发生改变的时候的监听事件 18 watcher.Changed += new FileSystemEventHandler(watch_changed); 19 //注册当删除目录的文件或者目录的时候的监听事件 20 watcher.Deleted += new FileSystemEventHandler(watch_deleted); 21 //当指定目录的文件或者目录发生重命名的时候的监听事件 22 watcher.Renamed += new RenamedEventHandler(watch_renamed); 23 //结束初始化 24 watcher.EndInit(); 25 }