タイマーは５種類

using System;
using System.Diagnostics;
using System.Threading;
using System.Windows.Forms;
using System.Windows.Threading;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
 
            Debug.WriteLine("Current UI Thread {0}", Thread.CurrentThread.ManagedThreadId);
 
            // Form
            var formTimer = new System.Windows.Forms.Timer();
            formTimer.Interval = 1000;
            formTimer.Tick += (_, __) => Debug.WriteLine("Forms.Timer {0}", Thread.CurrentThread.ManagedThreadId);
 
            buttonFormStart.Click += (_, __) => formTimer.Start();
            buttonFormStop.Click += (_, __) => formTimer.Stop();
 
            // Thead
            var theadTimer = new System.Threading.Timer((_) => Debug.WriteLine("Threading.Timer {0}", Thread.CurrentThread.ManagedThreadId));
 
            buttonThreadingStart.Click += (_, __) => theadTimer.Change(0, 1000);
            buttonThreadingStop.Click += (_, __) => theadTimer.Change(Timeout.Infinite, Timeout.Infinite);
 
            // Server 
            var serverTimer = new System.Timers.Timer();
            serverTimer.Interval = 1000;
            serverTimer.Elapsed += (_, __) => Debug.WriteLine("Timers.Timer {0}", Thread.CurrentThread.ManagedThreadId);
 
            buttonServerStart.Click += (_, __) => serverTimer.Start();
            buttonServerStop.Click += (_, __) => serverTimer.Stop();
 
            // Server(Sync)
            var serverTimer_Sync = new System.Timers.Timer();
            serverTimer_Sync.Interval = 1000;
            serverTimer_Sync.SynchronizingObject = this; // この設定があるとUIスレッドで実行される
            serverTimer_Sync.Elapsed += (_, __) => Debug.WriteLine("Timers.Timer (Sync) {0}", Thread.CurrentThread.ManagedThreadId);
 
 
            buttonServerStartSync.Click += (_, __) => serverTimer_Sync.Start();
            buttonServerStopSync.Click += (_, __) => serverTimer_Sync.Stop();
 
            // Dispatcher
            var dispatcherTimer = new DispatcherTimer(); 
            dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
            dispatcherTimer.Tick += (_, __) => Debug.WriteLine("Dispatcher.Timer {0}", Thread.CurrentThread.ManagedThreadId);
 
            buttonDispatcherStart.Click += (_, __) => dispatcherTimer.Start();
            buttonDispatcherStop.Click += (_, __) => dispatcherTimer.Stop();
        }
    }
}