How Can I Prevent Unexpected Termination When Monitoring a Directory in a Windows Forms Application?

Effective Directory Monitoring using FileSystemWatcher

When working with a Windows Forms Application, monitoring a directory and managing files dropped into it can be a common task. However, encountering unexpected termination of the program can raise concerns.

One potential reason for this issue lies in the notify filters. The code provided included several notify filters, including LastAccess, FileName, and DirectoryName. This resulted in the program attempting to open files that were still being copied into the directory.

To resolve this issue, it is advisable to fine-tune the notify filters. In the updated code snippet, all but the LastWrite filter have been removed. This ensures that the program only reacts when a write operation is performed on the directory, preventing attempts to open files that are still being copied.

private void watch()
{
  FileSystemWatcher watcher = new FileSystemWatcher();
  watcher.Path = path;
  watcher.NotifyFilter = NotifyFilters.LastWrite;
  watcher.Filter = "*.*";
  watcher.Changed += new FileSystemEventHandler(OnChanged);
  watcher.EnableRaisingEvents = true;
}

By implementing this change, the program can effectively monitor the directory and handle incoming files without encountering premature termination.

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