BrowserProcessService.cs

// Safely closes affected browsers before their live profile data is edited.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;

namespace NotiWhacker
{
    internal sealed class BrowserStopResult
    {
        public HashSet<string> SafeToEdit { get; } = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        public List<string> Warnings { get; } = new List<string>();
    }

    internal static class BrowserProcessService
    {
        public static BrowserStopResult StopAffected(IEnumerable<string> processNames)
        {
            BrowserStopResult result = new BrowserStopResult();
            foreach (string processName in processNames.Distinct(StringComparer.OrdinalIgnoreCase))
            {
                Process[] processes = Process.GetProcessesByName(processName);

                // Ask top-level windows to close first so the browser can flush unrelated profile state.
                foreach (Process process in processes)
                {
                    try { process.CloseMainWindow(); } catch { }
                }

                foreach (Process process in processes)
                {
                    try
                    {
                        if (!process.WaitForExit(5000))
                        {
                            process.Kill();
                            process.WaitForExit(5000);
                        }
                    }
                    catch (Exception ex) when (ex is Win32Exception || ex is InvalidOperationException || ex is NotSupportedException)
                    {
                        result.Warnings.Add("Could not stop " + processName + " process " + SafeProcessId(process) + ": " + ex.Message);
                    }
                    finally
                    {
                        process.Dispose();
                    }
                }

                Process[] remaining = Process.GetProcessesByName(processName);
                bool stopped = remaining.Length == 0;
                foreach (Process process in remaining) process.Dispose();

                if (stopped)
                {
                    result.SafeToEdit.Add(processName);
                }
                else
                {
                    result.Warnings.Add(processName + " is still running; its selected permissions were not changed.");
                }
            }
            return result;
        }

        private static string SafeProcessId(Process process)
        {
            try { return process.Id.ToString(); } catch { return "unknown"; }
        }
    }
}