Why Does My FileSystemWatcher Trigger the Changed Event Twice?

Problem description:

When monitoring text file changes using the FileSystemWatcher class, each time it is modified and saved the file, the OnChanged event will trigger twice.

Analysis of the cause:

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)
{
   // ...事件处理逻辑...
}

Solution:

Although attributes can sometimes alleviate this problem, in some cases, they may need to be manually filter and repeat incidents.

Optimize the suggestion used by FileSystemWatcher:

Filter repeat events based on other conditions (such as file size or content). NotifyFilter

Considering a third -party library that provides improved FileSystemWatcher functions.

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