C#通过FileSystemWatcher监控文件添加或者删除事件，当监控的目录里的文件增加或者删除时会触发指定的事件
代码语言：javascript复制using System;
using System.IO;
using System.Windows.Forms;
class MainClass {
static void Main(string[] args) {
using (FileSystemWatcher watch = new FileSystemWatcher()) {
watch.Path = Application.StartupPath;
watch.Filter = ".";
watch.IncludeSubdirectories = true;
// Attach the event handler.
watch.Created = new FileSystemEventHandler(OnCreatedOrDeleted);
watch.Deleted = new FileSystemEventHandler(OnCreatedOrDeleted);
watch.EnableRaisingEvents = true;
Console.WriteLine("Press Enter to create a file.");
Console.ReadLine();
if (File.Exists("test.bin")) {
File.Delete("test.bin");
}
// Create test.bin.
using (FileStream fs = new FileStream("test.bin", FileMode.Create)) {
// Do something.
}
Console.WriteLine("Press Enter to terminate the application.");
Console.ReadLine();
}
}
private static void OnCreatedOrDeleted(object sender, FileSystemEventArgs e) {
Console.WriteLine("tNOTIFICATION: " e.FullPath "' was " e.ChangeType.ToString());
Console.WriteLine();
}
}</pre> 
