canvas rectangle generate

PacticeSolution/MVVMCanvasRectangle/MainWindow.xaml.cs

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+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();
+        }
+    }
+}