Handles CheckBox Indeterminate events when a CheckBox changes to a indeterminate state. : CheckBox « Windows Presentation Foundation « VB.Net






Handles CheckBox Indeterminate events when a CheckBox changes to a indeterminate state.

Handles CheckBox Indeterminate events when a CheckBox changes to a indeterminate state.
   
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="250" Width="300">
    <StackPanel Name="panel">
        <CheckBox 
                  Content="Third CheckBox (Tri-State Enabled)" 
                  Indeterminate="CheckBox_Indeterminate"  IsChecked="True" 
                  IsThreeState="True" Margin="2" Name="checkbox3" 
                  />
        <Button Content="Get Selected" Margin="5" MaxWidth="100" 
                Click="Button_Click" />
        <TextBlock FontWeight="Bold" Text="Selected CheckBoxes:" />
        <ListBox Margin="5" MinHeight="2cm" Name="listbox" />
    </StackPanel>
</Window>
//File:Window.xaml.vb
Imports System.Linq
Imports System.Windows
Imports System.Windows.Controls

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub
    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
      listbox.Items.Clear()
      For Each checkbox As CheckBox In panel.Children.OfType(Of CheckBox)().Where(Function(cb) cb.IsChecked = True)
        listbox.Items.Add(checkbox.Name)
      Next
    End Sub
    Private Sub CheckBox_Indeterminate(sender As Object, e As RoutedEventArgs)
      If Not IsInitialized Then
        Return
      End If

      Dim checkbox As CheckBox = TryCast(e.OriginalSource, CheckBox)

      If checkbox IsNot Nothing Then
        MessageBox.Show(checkbox.Name & " is indeterminate.", Title)
      End If
    End Sub

  End Class
End Namespace

   
    
    
  








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