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在C#中，你可以使用异常处理来处理Watcher可能遇到的异常情况。以下是一个基本的示例，展示了如何在Watcher中处理异常：
using System; using System.IO; using System.Threading.Tasks; using System.Windows.Forms; namespace WatcherExample { public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private void btnStartWatcher_Click(object sender, EventArgs e) { btnStartWatcher.Enabled = false; btnStopWatcher.Enabled = true; Task.Run(() => StartWatcher()); } private void btnStopWatcher_Click(object sender, EventArgs e) { btnStartWatcher.Enabled = true; btnStopWatcher.Enabled = false; } private void StartWatcher() { try { FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = @"C:\example_folder"; watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName; watcher.Changed += new FileSystemEventHandler(OnChanged); watcher.Created += new FileSystemEventHandler(OnChanged); watcher.Deleted += new FileSystemEventHandler(OnChanged); watcher.Renamed += new RenamedEventHandler(OnRenamed); watcher.EnableRaisingEvents = true; Console.WriteLine("Watcher started."); } catch (Exception ex) { MessageBox.Show("Error: " + ex.Message); } } private void OnChanged(object source, FileSystemEventArgs e) { // Handle the change event here. Console.WriteLine($"File '{e.FullPath}' has been changed."); } private void OnRenamed(object source, RenamedEventArgs e) { // Handle the rename event here. Console.WriteLine($"File '{e.OldFullPath}' has been renamed to '{e.FullPath}'."); } } } 在这个示例中，我们创建了一个简单的WinForms应用程序，其中包含一个开始Watcher按钮和一个停止Watcher按钮。当点击开始按钮时，会启动一个新的Watcher任务，该任务将监视指定的文件夹。如果在启动Watcher时发生任何异常，程序将弹出一个包含异常消息的对话框。
