如何处理FileSystemWatcher事件中的事件侦听器 [英] How to dispose of event listeners from FileSystemWatcher events

问题描述

使用FileSystemWatcher，有没有办法在事件触发后处置事件侦听器的实例?

Using FileSystemWatcher, is there a way to dispose of instances of event listeners after an event has fired?

我的程序基本上在新创建的文件夹中侦听batch.complete.xml文件的创建.程序检测到文件已创建后，就无需继续在此文件夹中进行侦听了.

My program basically listens for the creation of a batch.complete.xml file in newly created folders. Once the program detects that the file has been created there is no need to continue listening in this folder.

我的程序如下:

public static void watchxmlfile(batchfolderpath){

 var deliverycompletewatcher = new FileSystemWatcher();    

 deliverycompletewatcher.Path = batchfolderpath;

 deliverycompletewatcher.Filter = "*.xml";

 deliverycompletewatcher.Created += new FileSystemEventHandler(OnChanged);

 deliverycompletewatcher.EnableRaisingEvents = true;

}


private static void OnChanged(object sender, FileSystemEventArgs e)
{
    BuildingestionXml(string.Format(@"{0}\{1}",e.FullPath,e.Name));
    Console.WriteLine(@"Second: Success sending{0}\{1}", e.FullPath, e.Name);
}

因此，当触发以上事件时，除非显式调用watchxmlfile()并将其具有新路径，否则我不再需要在"batchfolderpath"中监视事件.

So when the above event is fired I no longer need to watch for events in "batchfolderpath" unless watchxmlfile() is explicitly called which will have a new path.

我正在尝试防止上述事件的过多侦听器实例引起的内存泄漏.

I am trying to prevent memory leaks from too many instances of listeners for the above event.

推荐答案

您不需要分配变量，sender是FileSystemWatcher:

You don't need to assign a variable, sender is the FileSystemWatcher:

private static void OnChanged(object sender, FileSystemEventArgs e)
{
    BuildingestionXml(string.Format(@"{0}\{1}",e.FullPath,e.Name));
    Console.WriteLine(@"Second: Success sending{0}\{1}", e.FullPath, e.Name);
    ((FileSystemWatcher)sender).Dispose();
}

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