Passing parameter to an event handler [stackoverflow],

Passing parameter to an event handler [stackoverflow],

Q:

I want to pass myList<string>As parameter using my event

public event EventHandler _newFileEventHandler;    List<string> _filesList = new List<string>();public void startListener(string directoryPath){    FileSystemWatcher watcher = new FileSystemWatcher(directoryPath);    _filesList = new List<string>();    _timer = new System.Timers.Timer(5000);    watcher.Filter = "*.pcap";    watcher.Created += watcher_Created;                watcher.EnableRaisingEvents = true;    watcher.IncludeSubdirectories = true;}void watcher_Created(object sender, FileSystemEventArgs e){                _timer.Elapsed += new ElapsedEventHandler(myEvent);    _timer.Enabled = true;    _filesList.Add(e.FullPath);    _fileToAdd = e.FullPath;}private void myEvent(object sender, ElapsedEventArgs e){    _newFileEventHandler(_filesList, EventArgs.Empty);;}

And from my main form I want to get this List:

void listener_newFileEventHandler(object sender, EventArgs e){}

A:

Make a new EventArgs class such:

public class ListEventArgs : EventArgs    {        public List<string> Data { get; set; }        public ListEventArgs(List<string> data)        {            Data = data;        }    }

And make your event as this:

public event EventHandler<ListEventArgs> NewFileAdded;

Add a firing method:

protected void OnNewFileAdded(List<string> data){    var localCopy = NewFileAdded;    if (localCopy != null)    {        localCopy(this, new ListEventArgs(data));    }}

And when you want to handle this event:

myObj.NewFileAdded += new EventHandler<ListEventArgs>(myObj_NewFileAdded);

The handler method wowould appear like this:

public void myObj_NewFileAdded(object sender, ListEventArgs e){       // Do what you want with e.Data (It is a List of string)}