Split logic and design

Tasks/UrlTester/DT3/DT3cs.cs

@@ -54,6 +54,7 @@ namespace DT3 {
             {
                 url = value;
                 NotifyPropertyChanged();
+                _ = urlTester.GetUrlAsync(Url);
             }
         }
 

Tasks/UrlTester/MainWindow.xaml

@@ -5,7 +5,6 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:DT3"
         mc:Ignorable="d"
-        DataContext="{Binding RelativeSource={RelativeSource Self}}"
         Title="MainWindow"
         Height="450"
         Width="800">
@@ -33,10 +32,9 @@
                         <ColumnDefinition Width="*" />
                     </Grid.ColumnDefinitions>
                     <Button Content="GetUrl"
-                            IsDefault="true"
-                            Click="GetUrl" />
+                            IsDefault="true" />
                     <TextBox Grid.Column="2"
-                             x:Name="urlBox" />
+                             Text="{Binding Url, Mode=OneWayToSource}" />
                 </Grid>
                 <StackPanel Orientation="Horizontal">
                     <StackPanel.Resources>

Tasks/UrlTester/MainWindow.xaml.cs

@@ -10,6 +10,7 @@ using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
 using DT2;
+using DT3;
 
 namespace UrlTester;
 
@@ -18,39 +19,9 @@ namespace UrlTester;
 /// </summary>
 public partial class MainWindow : Window
 {
-    public static readonly DependencyProperty SizeProperty = DependencyProperty.Register(
-        "Size",
-        typeof(int),
-        typeof(MainWindow));
-
-    public static readonly DependencyProperty TimeProperty = DependencyProperty.Register(
-        "Time",
-        typeof(long),
-        typeof(MainWindow));
-
     public MainWindow()
     {
         InitializeComponent();
-    }
-
-    public void GetUrl(object sender, RoutedEventArgs e)
-    {
-        var tester = new DT2.UrlTester();
-        var stopWatch = new Stopwatch();
-
-        tester.PageStart += (_) =>
-        {
-            stopWatch.Start();
-        };
-
-        tester.PageLoaded += (_, size) =>
-        {
-            stopWatch.Stop();
-            SetValue(SizeProperty, size);
-            SetValue(TimeProperty, stopWatch.ElapsedMilliseconds);
-            Debug.WriteLine("");
-        };
-
-        _ = tester.GetUrlAsync(urlBox.Text);
+        DataContext = new UrlTesterModel();
     }
 }