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

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();      }  }