本文介绍了FileSystemWatcher Changed 事件引发两次的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个应用程序，我在其中查找文本文件，如果对文件进行了任何更改，我将使用 OnChanged 事件处理程序来处理事件.我正在使用 NotifyFilters.LastWriteTime 但该事件仍然被触发两次.这是代码.
I have an application where I am looking for a text file and if there are any changes made to the file I am using the OnChanged eventhandler to handle the event. I am using the NotifyFilters.LastWriteTime but still the event is getting fired twice. Here is the code.
public void Initialize()
{
FileSystemWatcher _fileWatcher = new FileSystemWatcher();
_fileWatcher.Path = "C:\Folder";
_fileWatcher.NotifyFilter = NotifyFilters.LastWrite;
_fileWatcher.Filter = "Version.txt";
_fileWatcher.Changed += new FileSystemEventHandler(OnChanged);
_fileWatcher.EnableRaisingEvents = true;
}
private void OnChanged(object source, FileSystemEventArgs e)
{
.......
}
在我的情况下，OnChanged 被调用了两次，当我更改文本文件 version.txt 并保存它时.
In my case the OnChanged is called twice, when I change the text file version.txt and save it.
推荐答案
我已经在我的委托中使用以下策略修复"了这个问题:
I've "fixed" that problem using the following strategy in my delegate:
// fsw_ is the FileSystemWatcher instance used by my application.
private void OnDirectoryChanged(...)
{
try
{
fsw_.EnableRaisingEvents = false;
/* do my stuff once asynchronously */
}
finally
{
fsw_.EnableRaisingEvents = true;
}
}
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