Add article, code, toc, and redirects (#1343)

dotnet-desktop-guide/net/wpf/events/snippets/object-lifetime-events/csharp/MainWindow.xaml.cs

@@ -0,0 +1,71 @@
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace CodeSampleCsharp
+{
+    //<LifetimeEventsCodeBehind>
+    public partial class MainWindow : Window
+    {
+        public MainWindow() => InitializeComponent();
+
+        // Handler for the Initialized lifetime event (attached in XAML).
+        private void InitHandler(object sender, System.EventArgs e) => 
+            Debug.WriteLine($"Initialized event on {((FrameworkElement)sender).Name}.");
+
+        // Handler for the Loaded lifetime event (attached in XAML).
+        private void LoadHandler(object sender, RoutedEventArgs e) => 
+            Debug.WriteLine($"Loaded event on {((FrameworkElement)sender).Name}.");
+
+        // Handler for the Unloaded lifetime event (attached in XAML).
+        private void UnloadHandler(object sender, RoutedEventArgs e) =>
+            Debug.WriteLine($"Unloaded event on {((FrameworkElement)sender).Name}.");
+
+        // Remove nested controls.
+        private void Button_Click(object sender, RoutedEventArgs e) => 
+            canvas.Children.Clear();
+    }
+
+    // Custom control.
+    public class ComponentWrapper : ComponentWrapperBase { }
+
+    // Custom base control.
+    public class ComponentWrapperBase : StackPanel
+    {
+        public ComponentWrapperBase()
+        {
+            // Assign handler for the Initialized lifetime event (attached in code-behind).
+            Initialized += (object sender, System.EventArgs e) => 
+                Debug.WriteLine($"Initialized event on componentWrapperBase.");
+
+            // Assign handler for the Loaded lifetime event (attached in code-behind).
+            Loaded += (object sender, RoutedEventArgs e) => 
+                Debug.WriteLine($"Loaded event on componentWrapperBase.");
+
+            // Assign handler for the Unloaded lifetime event (attached in code-behind).
+            Unloaded += (object sender, RoutedEventArgs e) => 
+                Debug.WriteLine($"Unloaded event on componentWrapperBase.");
+        }
+    }
+
+    /* Output:
+    Initialized event on textBox1.
+    Initialized event on textBox2.
+    Initialized event on componentWrapperBase.
+    Initialized event on componentWrapper.
+    Initialized event on outerStackPanel.
+
+    Loaded event on outerStackPanel.
+    Loaded event on componentWrapperBase.
+    Loaded event on componentWrapper.
+    Loaded event on textBox1.
+    Loaded event on textBox2.
+
+    Unloaded event on outerStackPanel.
+    Unloaded event on componentWrapperBase.
+    Unloaded event on componentWrapper.
+    Unloaded event on textBox1.
+    Unloaded event on textBox2.
+    */
+    //</LifetimeEventsCodeBehind>
+}