C＃中FileSystemWatcher事件处理程序的访问方法

Question

I am trying to access a method from inside an event handler using the FileSystemWatcher. It seems like variations of this question have been asked but I sure can't seem to use any of them to answer to this point. In the code below I want to be able to access ReadNoteFile from OnChanged but cannot. Any help would be greatly appreciated.

public void CreateFileWatcher(string path)
    {
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = path;

        watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
           | NotifyFilters.FileName | NotifyFilters.DirectoryName;

        watcher.Filter = "*.txt";

        watcher.Changed += new FileSystemEventHandler(OnChanged);

        watcher.EnableRaisingEvents = true;
    }


public static void OnChanged(object source, FileSystemEventArgs e)
    {
        MessageBox.Show("New note has arrived!");

        //run ReadNoteFile here

    }

public void ReadNoteFile(string path)
    {
        //do some stuff
    }

Answer 1

The FileSystemEventHandler constructor expects (object, IntPtr) arguments.

I suggest skipping the creation of another object and pass a lambda directly (as is usual practice nowadays in this scenario):

watcher.Changed += delegate() { MessageBox.Show("New note has arrived!"); };

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FileSystemWatcher#Changed