WPF_Practice/PacticeSolution/MVVMCanvasRectangle/MainWindow.xaml.cs

using MVVMCanvasRectangle.ViewModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Timers;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace MVVMCanvasRectangle
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private System.Timers.Timer _timer;

        public MainWindow()
        {
            InitializeComponent();

            _timer = new System.Timers.Timer();
            _timer.Interval = 1000;
            _timer.Elapsed -= _timer_Elapsed;
            _timer.Elapsed += _timer_Elapsed;
            _timer.Start();
        }

        private void _timer_Elapsed(object? sender, ElapsedEventArgs e)
        {
            if (this.Dispatcher.Thread != Thread.CurrentThread)
            {
                this.Dispatcher.Invoke(DispatcherPriority.Normal, () =>
                {
                    AddOneRect();
                });
            }
            else
            {
                AddOneRect();
            }
        }

        private void AddOneRect()
        {
            RectModelView dataContext = this.DataContext as RectModelView;
            if (dataContext == null)
                return;

            dataContext.AddOne();
        }
    }
}