Question

使用FileSystemWatcher，是否有办法在事件触发后处理事件侦听器的实例？

我的程序基本上是在新创建的文件夹中监听batch.complete.xml文件的创建。一旦程序检测到文件已经创建，就不需要继续监听该文件夹了。

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，当上述事件被触发时，我不再需要在“batchfolderpath”中监视事件，除非显式调用watchxmlfile（），它将有一个新路径。

我正在尝试防止上述事件的过多侦听器实例的内存泄漏。

Answer 1

在你EventHandler中，您可以取消分配事件，但您必须将FileSystemWatcher声明为变量。

实施例

    private static FileSystemWatcher deliverycompletewatcher;

    public static void watchxmlfile(string batchfolderpath)
    {
        deliverycompletewatcher = new FileSystemWatcher();
        deliverycompletewatcher.Path = batchfolderpath;
        deliverycompletewatcher.Filter = "*.xml";
        deliverycompletewatcher.Created += OnChanged;
        deliverycompletewatcher.EnableRaisingEvents = true;
    }


    private static void OnChanged(object sender, FileSystemEventArgs e)
    {
        deliverycompletewatcher.EnableRaisingEvents = false;
        deliverycompletewatcher.Created -= OnChanged;

        // Do some cool stuff
    }

Answer 2

您不需要分配变量，sender是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();
}

如何从FileSystemWatcher事件中处理事件侦听器

2 个答案: