我为FileSystemWatcher
创建了包装器类,但是无法触发事件。使用FileSystemWatcher
类时,它们按预期方式触发,但不是我的包装器。
任何想法为什么?
public class FolderWatcher
{
public event FileSystemEventHandler Created;
public event FileSystemEventHandler Changed;
private FileSystemWatcher _watcher;
public FolderWatcher(string watchedFolderPath)
{
_watcher = new FileSystemWatcher(watchedFolderPath);
_watcher.Created += Created;
_watcher.Changed += Changed;
_watcher.EnableRaisingEvents = true;
}
}
class Program
{
static async Task Main(string[] args)
{
string watchedFolder = "/home/user";
// 1. Custom wrapper for FileSystemWatcher. No events get fired.
FolderWatcher watcher = new FolderWatcher(watchedFolder);
// 2. The built in FileSystemWatcher works as expected. Uncomment to test.
// FileSystemWatcher watcher = new FileSystemWatcher(watchedFolder);
// watcher.EnableRaisingEvents = true;
bool createdTriggered = false;
bool changedTriggered = false;
bool wait = (changedTriggered == false && createdTriggered == false);
watcher.Created += (sender, args) =>
{
createdTriggered = true;
Console.WriteLine($"{args.Name} created!");
};
watcher.Changed += (sender, args) =>
{
changedTriggered = true;
Console.WriteLine($"{args.Name} changed!");
};
Console.WriteLine($"Watching folder {watchedFolder}");
while (wait)
{
await Task.Delay(1);
}
Console.WriteLine("Closing application...");
}
}
[为了测试,我刚刚启动它并创建一个新文件/编辑/home/user
中的现有文件。方案1(在代码中注释)不会触发事件,但是方案2(在代码中注释)不会触发事件。我正在努力找出原因。
值得一提的是,我不太喜欢this answer.
而不是尝试将File Watcher的事件挂接到您的事件,而是在捕获File Watcher的事件时仅触发您的事件。
watcher.Changed += (sender, args) =>
{
if (Created != null)
Created(sender, args);
}
您的活动在那儿,有人正在使用您的课程上钩。
为了简化罗伯特·哈维的答案,只需将构造函数更新为:
public FolderWatcher(string watchedFolderPath)
{
_watcher = new FileSystemWatcher(watchedFolderPath);
_watcher.Created += (sender, args) => this.Created(sender, args);
_watcher.Changed += (sender, args) => this.Changed(sender, args);
_watcher.EnableRaisingEvents = true;
}