C#利用FileSystemWatcher实时监控文件的增加,修改,重命名和删除

在C#中，可以使用FileSystemWatcher类实现对文件夹进行监视，实现对文件夹中文件的增加、修改、重命名和删除等操作的即时监控。

FileSystemWatcher基本用法

1. 创建FileSystemWatcher对象

FileSystemWatcher watcher = new FileSystemWatcher();

1. 设置FileSystemWatcher对象的需要监控的文件夹路径

watcher.Path = @"C:\SomePath";

1. 设置需要监控的文件类型

watcher.Filter = "*.*";

1. 启动监视

watcher.EnableRaisingEvents = true;

1. 为FileSystemWatcher注册监控事件

watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
watcher.Deleted += new FileSystemEventHandler(OnDeleted);

1. 定义监视事件的处理方法

private static void OnChanged(object sender, FileSystemEventArgs e)
{
    Console.WriteLine($"File {e.FullPath} has been {e.ChangeType}");
}

private static void OnRenamed(object sender, RenamedEventArgs e)
{
    Console.WriteLine($"File {e.OldFullPath} has been renamed to {e.FullPath}");
}

private static void OnDeleted(object sender, FileSystemEventArgs e)
{
    Console.WriteLine($"File {e.FullPath} has been deleted");
}

示例一：监视文件夹中的文件即时增加事件

// 创建FileSystemWatcher对象
FileSystemWatcher watcher = new FileSystemWatcher();

// 设置FileSystemWatcher对象的需要监控的文件夹路径
watcher.Path = @"C:\SomePath";

// 设置需要监控的文件类型
watcher.Filter = "*.*";

// 启动监视
watcher.EnableRaisingEvents = true;

// 为FileSystemWatcher注册监控事件
watcher.Created += new FileSystemEventHandler(OnFileAdded);

// 定义监视事件的处理方法
private static void OnFileAdded(object sender, FileSystemEventArgs e)
{
    Console.WriteLine($"File {e.FullPath} has been added to the folder");
}

示例二：监视文件夹中的文件即时修改事件

// 创建FileSystemWatcher对象
FileSystemWatcher watcher = new FileSystemWatcher();

// 设置FileSystemWatcher对象的需要监控的文件夹路径
watcher.Path = @"C:\SomePath";

// 设置需要监控的文件类型
watcher.Filter = "*.*";

// 启动监视
watcher.EnableRaisingEvents = true;

// 为FileSystemWatcher注册监控事件
watcher.Changed += new FileSystemEventHandler(OnFileChanged);

// 定义监视事件的处理方法
private static void OnFileChanged(object sender, FileSystemEventArgs e)
{
    Console.WriteLine($"File {e.FullPath} has been modified");
}