Convert contents of a ListBoxItem to an instance of Thickness by using the ThicknessConverter

     

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="ThicknessConverter_Csharp.Window1"
    Title="ThicknessConverter Sample">
  <DockPanel Width="400" HorizontalAlignment="Left" VerticalAlignment="Top">
    <TextBlock DockPanel.Dock="Top" FontFamily="Verdana" FontSize="18" FontWeight="Bold" Margin="5">
      ThicknessConverter Sample</TextBlock>
    <Border Name="border1" Height="300" Width="300" Border.BorderThickness="2" Border.BorderBrush="Black" DockPanel.Dock="Top">
      <Grid Height="30" VerticalAlignment="Top">
        <Grid.RowDefinitions>
          <RowDefinition/>
          <RowDefinition/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0" Name="bThickness"/>
        <TextBlock Grid.Row="1" Name="bColor"/>
      </Grid>
    </Border>
    <Grid DockPanel.Dock="Top">
      <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
        <ColumnDefinition/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <TextBlock Grid.Row="1" Grid.Column="0" Margin="10,0,0,0" TextWrapping="Wrap">Change the BorderThickness Property:</TextBlock>
      <ListBox VerticalAlignment="Top" Grid.Column="1" Grid.Row="1" Width="50" Height="50" Margin="5" SelectionChanged="changeThickness">
        <ListBoxItem>0</ListBoxItem>
        <ListBoxItem>5</ListBoxItem>
        <ListBoxItem>10</ListBoxItem>
        <ListBoxItem>15</ListBoxItem>
        <ListBoxItem>20</ListBoxItem>
        <ListBoxItem>25</ListBoxItem>
        <ListBoxItem>30</ListBoxItem>
        <ListBoxItem>35</ListBoxItem>
        <ListBoxItem>40</ListBoxItem>
        <ListBoxItem>45</ListBoxItem>
        <ListBoxItem>50</ListBoxItem>
      </ListBox>
    </Grid>
  </DockPanel>        
</Window>

//File:Window.xaml.vb
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents
Imports System.Windows.Navigation
Imports System.Windows.Media

Namespace ThicknessConverter_Csharp
  Public Partial Class Window1
    Inherits Window
    Public Sub changeThickness(sender As Object, args As SelectionChangedEventArgs)
      Dim li As ListBoxItem = TryCast(TryCast(sender, ListBox).SelectedItem, ListBoxItem)
      Dim myThicknessConverter As New ThicknessConverter()
      Dim th1 As Thickness = CType(myThicknessConverter.ConvertFromString(li.Content.ToString()), Thickness)
      border1.BorderThickness = th1
      bThickness.Text = "Border.BorderThickness =" & li.Content.ToString()
    End Sub
  End Class
End Namespace

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Convert contents of a ListBoxItem to an instance of Thickness by using the ThicknessConverter : ListBox « Windows Presentation Foundation « VB.Net

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