Contains Element? : Xaml « Windows Presentation Foundation « VB.Net Tutorial






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  3. Xaml
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="ElemCollMethods.Pane1"
    WindowTitle="UI Element Collection Methods Sample">
 <StackPanel>
    <TextBlock Name="txt" FontSize="16">UI Element Collection - Methods</TextBlock>

    <TabControl>
        <TabItem MouseLeftButtonUp="ContainsElement">
            <TabItem.Header>Contains Element?</TabItem.Header>
        </TabItem>
    </TabControl>
    <StackPanel Name="sp1"></StackPanel>

 </StackPanel>
</Page>
//File:Window.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents
Imports System.Windows.Navigation
Imports System.Windows.Shapes
Imports System.Windows.Data
Imports System.Windows.Input

Namespace ElemCollMethods

  Public Partial Class Pane1
    Inherits Page
    Private btn As System.Windows.Controls.Button, btn1 As System.Windows.Controls.Button, btn2 As System.Windows.Controls.Button, btn3 As System.Windows.Controls.Button

    Private Sub ContainsElement(sender As Object, e As RoutedEventArgs)
      sp1.Children.Clear()
      btn = New Button()
      btn.Content = "Click to clear"
      sp1.Children.Add(btn)
      AddHandler btn.Click, (AddressOf ClearControls)
      btn1 = New Button()
      btn1.Content = "Click to clear"
      sp1.Children.Add(btn1)
      AddHandler btn1.Click, (AddressOf ClearControls)
      btn2 = New Button()
      btn2.Content = "Click to clear"
      sp1.Children.Add(btn2)
      AddHandler btn2.Click, (AddressOf ClearControls)
      btn3 = New Button()
      btn3.Content = "Click to clear"
      sp1.Children.Add(btn3)
      AddHandler btn3.Click, (AddressOf ClearControls)

      Dim txt1 As New TextBlock()
      sp1.Children.Add(txt1)
      txt1.Text = "This StackPanel contains UIElement btn1: " + sp1.Children.Contains(btn1).ToString()
    End Sub

    Private Sub ClearControls(sender As Object, e As RoutedEventArgs)
      sp1.Children.Clear()
    End Sub
  End Class
End Namespace
WPF Contains Element




16.131.Xaml
16.131.1.A simple XAML structureA simple XAML structure
16.131.2.Properties in XAMLProperties in XAML
16.131.3.Embdded implementation of our button's Click event handlerEmbdded implementation of our button's Click event handler
16.131.4.Create a Standard WPF ApplicationCreate a Standard WPF Application
16.131.5.Inline click eventInline click event
16.131.6.Inlining code within a XAML fileInlining code within a XAML file
16.131.7.Inline declaration of a simple attributeInline declaration of a simple attribute
16.131.8.Explicit declaration of a complex attributeExplicit declaration of a complex attribute
16.131.9.Button with explicitly declared Background BrushButton with explicitly declared Background Brush
16.131.10.Button with a Background Brush declared using abbreviated markupButton with a Background Brush declared using abbreviated markup
16.131.11.Example of abbreviated markup versus explicit syntaxExample of abbreviated markup versus explicit syntax
16.131.12.Using Width to constrain the size of elementsUsing Width to constrain the size of elements
16.131.13.Display Control Content Surrounded by BracesDisplay Control Content Surrounded by Braces
16.131.14.WPF provides four different units of measures:WPF provides four different units of measures:
16.131.15.Draw a line from Point(0,0) to Point (100,100) on the canvas with the default units of device-independent pixelsDraw a line from Point(0,0) to Point (100,100) on the canvas with the default units of device-independent pixels
16.131.16.My First WPF App with code behindMy First WPF App with code behind
16.131.17.Create Button from Xaml stringCreate Button from Xaml string
16.131.18.A default miter limit of 10A default miter limit of 10
16.131.19.Pure XAML RSS ReaderPure XAML RSS Reader
16.131.20.Reference name defined in Xaml in vb fileReference name defined in Xaml in vb file
16.131.21.Add child controlAdd child control
16.131.22.Show Index of ControlsShow Index of Controls
16.131.23.Clear ControlsClear Controls
16.131.24.Contains Element?Contains Element?
16.131.25.Xaml and Code behindXaml and Code behind
16.131.26.Insert new line character to xaml attributeInsert new line character to xaml attribute