FileSystemWatcher szüneteltetése (C#)

Question

Sziasztok!

Szeretnék beépíteni egy gombot (button5), aminek a megnyomása esetén lehetne szüneteltetni, illetve aztán tovább folytatni a FileSystemWatcher működését. Hogyan tudnám ezt beépíteni az alábbi kódba?

Form1.cs

using System;
using System.IO;
using System.Diagnostics;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Globalization;

namespace FirstApp
{
    public partial class Form1 : Form
    {

        public static string path_import = "";
        public static string path_export = "";
        FileSystemWatcher watcher;
	SemaphoreSlim semaphore;

        public Form1()
        {
            InitializeComponent(); 
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private void button3_Click(object sender, EventArgs e)
        {
	    numericUpDown1.Enabled = false;
	    int i = (int)numericUpDown1.Value;
            semaphore = new SemaphoreSlim(i, i);
            this.watch();
        }

        private void watch()
        {
            watcher = new FileSystemWatcher();
            watcher.Path = Form1.path_import;
            watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
                                   | NotifyFilters.FileName | NotifyFilters.DirectoryName;
            watcher.Filter = "*.mp4";
            watcher.Renamed += OnRenamed;
            watcher.EnableRaisingEvents = true;
        }

	private void OnRenamed(object source, RenamedEventArgs e) 
	{ 
            Task.Run(async() => { 
            	await Task.Delay(1000); 
            	await semaphore.WaitAsync(); 
            	try
            	{
            		ProcessRenaming(e.FullPath, e.Name);  
            	}
            	finally 
            	{
            		semaphore.Release(); 
            	}
	    });
	}

        private void ProcessRenaming(string fullPath, string name)
        {
            var lastPart = fullPath.Split('.').Last();
            if (lastPart == "mp4")
            {
                File.Move(fullPath, fullPath + ".firstapp");
                string nf = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(name);
                Process prcExecuteFFMPEG = new Process();
                prcExecuteFFMPEG.StartInfo.FileName = "ffmpeg.exe";
                prcExecuteFFMPEG.StartInfo.Arguments = "-ss 00:00:30 -i "" + fullPath + ".firstapp" -c copy "" + path_export + "" + nf + """;
                prcExecuteFFMPEG.StartInfo.UseShellExecute = false;
                prcExecuteFFMPEG.StartInfo.RedirectStandardOutput = true;
                prcExecuteFFMPEG.StartInfo.CreateNoWindow = true;
                prcExecuteFFMPEG.Start();
                prcExecuteFFMPEG.WaitForExit();
                string strOutput = prcExecuteFFMPEG.StandardOutput.ReadToEnd();
                File.Delete(fullPath + ".firstapp");
            }
        }

	private void button5_Click(object sender, EventArgs e)
        {
	    // ...
        }

    }
}

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