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

2026-09-08 16:06:07 +02:00 · 2022-04-04 13:46:22 -07:00
parent 907918d922
commit 0baa50f040
18 changed files with 600 additions and 0 deletions
@@ -0,0 +1,9 @@
+<Application x:Class="Application"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:CodeSampleVb"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
@@ -0,0 +1,6 @@
+Class Application
+
+    ' Application-level events, such as Startup, Exit, and DispatcherUnhandledException
+    ' can be handled in this file.
+
+End Class
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+'The ThemeInfo attribute describes where any theme specific and generic resource dictionaries can be found.
+'1st parameter: where theme specific resource dictionaries are located
+'(used if a resource is not found in the page,
+' or application resource dictionaries)
+
+'2nd parameter: where the generic resource dictionary is located
+'(used if a resource is not found in the page,
+'app, and any theme specific resource dictionaries)
+<Assembly: ThemeInfo(ResourceDictionaryLocation.None, ResourceDictionaryLocation.SourceAssembly)>
@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <RootNamespace>CodeSampleVb</RootNamespace>
+    <NeutralLanguage>en-us</NeutralLanguage>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Import Include="System.Windows" />
+    <Import Include="System.Windows.Controls" />
+    <Import Include="System.Windows.Data" />
+    <Import Include="System.Windows.Documents" />
+    <Import Include="System.Windows.Input" />
+    <Import Include="System.Windows.Media" />
+    <Import Include="System.Windows.Media.Imaging" />
+    <Import Include="System.Windows.Navigation" />
+    <Import Include="System.Windows.Shapes" />
+  </ItemGroup>
+
+</Project>
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+<Window x:Class="MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
+    xmlns:custom="clr-namespace:CodeSampleVb"
+    Title="Object lifetime events" Height="100" Width="300">
+
+    <!--<LifetimeEventsXaml>-->
+    <Canvas x:Name="canvas">
+        <StackPanel x:Name="outerStackPanel" Initialized="InitHandler" Loaded="LoadHandler" Unloaded="UnloadHandler">
+            <custom:ComponentWrapper x:Name="componentWrapper" Initialized="InitHandler" Loaded="LoadHandler" Unloaded="UnloadHandler">
+                <TextBox x:Name="textBox1" Initialized="InitHandler" Loaded="LoadHandler" Unloaded="UnloadHandler" />
+                <TextBox x:Name="textBox2" Initialized="InitHandler" Loaded="LoadHandler" Unloaded="UnloadHandler" />
+            </custom:ComponentWrapper>
+        </StackPanel>
+        <Button Content="Remove canvas child elements" Click="Button_Click"/>
+    </Canvas>
+    <!--</LifetimeEventsXaml>-->
+
+</Window>
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+'<LifetimeEventsCodeBehind>
+Partial Public Class MainWindow
+    Inherits Window
+
+    Public Sub New()
+        InitializeComponent()
+    End Sub
+
+    ' Handler for the Initialized lifetime event (attached in XAML).
+    Private Sub InitHandler(sender As Object, e As EventArgs)
+        Debug.WriteLine($"Initialized event on {CType(sender, FrameworkElement).Name}.")
+    End Sub
+
+    ' Handler for the Loaded lifetime event (attached in XAML).
+    Private Sub LoadHandler(sender As Object, e As RoutedEventArgs)
+        Debug.WriteLine($"Loaded event on {CType(sender, FrameworkElement).Name}.")
+    End Sub
+
+    ' Handler for the Unloaded lifetime event (attached in XAML).
+    Private Sub UnloadHandler(sender As Object, e As RoutedEventArgs)
+        Debug.WriteLine($"Unloaded event on {CType(sender, FrameworkElement).Name}.")
+    End Sub
+
+    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
+        ' Remove nested controls.
+        canvas.Children.Clear()
+    End Sub
+End Class
+
+' Custom control.
+Public Class ComponentWrapper
+    Inherits ComponentWrapperBase
+End Class
+
+' Custom base control.
+Public Class ComponentWrapperBase
+    Inherits StackPanel
+
+    Public Sub New()
+        ' Attach handlers for the lifetime events.
+        AddHandler Initialized, AddressOf InitHandler
+        AddHandler Loaded, AddressOf LoadHandler
+        AddHandler Unloaded, AddressOf UnloadHandler
+    End Sub
+
+    ' Handler for the Initialized lifetime event (attached in code-behind).
+    Private Sub InitHandler(sender As Object, e As EventArgs)
+        Debug.WriteLine("Initialized event on componentWrapperBase.")
+    End Sub
+
+    ' Handler for the Loaded lifetime event (attached in code-behind).
+    Private Sub LoadHandler(sender As Object, e As RoutedEventArgs)
+        Debug.WriteLine("Loaded event on componentWrapperBase.")
+    End Sub
+
+    ' Handler for the Unloaded lifetime event (attached in code-behind).
+    Private Sub UnloadHandler(sender As Object, e As RoutedEventArgs)
+        Debug.WriteLine("Unloaded event on componentWrapperBase.")
+    End Sub
+End Class
+
+'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>