Use the FontSizeConverter class to convert the content of a ListBoxItem to a value that represents the size of a font.

     


<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="FontSizeConverter_Csharp.Window1"
    Title="FontSizeConverter Sample">
<StackPanel>
        <TextBlock Name="text1" TextWrapping="Wrap" Height="300" Width="500">
            this is a test
        </TextBlock>
    <ListBox Grid.Column="1" Grid.Row="1" VerticalAlignment="Top" Height="50" Margin="10,0,0,0" SelectionChanged="changeSize">
        <ListBoxItem>5</ListBoxItem>
        <ListBoxItem>8</ListBoxItem>
        <ListBoxItem>11</ListBoxItem>
        <ListBoxItem>14</ListBoxItem>
        <ListBoxItem>17</ListBoxItem>
        <ListBoxItem>20</ListBoxItem>
        <ListBoxItem>23</ListBoxItem>
        <ListBoxItem>26</ListBoxItem>
        <ListBoxItem>29</ListBoxItem>
        <ListBoxItem>32</ListBoxItem>
    </ListBox>
    <ListBox Grid.Column="3" Grid.Row="1" VerticalAlignment="Top" Height="50" Margin="10,0,0,0" SelectionChanged="changeFamily">
      <ListBoxItem>Arial</ListBoxItem>
      <ListBoxItem>Courier New</ListBoxItem>
      <ListBoxItem>Tahoma</ListBoxItem>
      <ListBoxItem>Times New Roman</ListBoxItem>
      <ListBoxItem>Verdana</ListBoxItem>
    </ListBox>      
   
  </StackPanel>        
</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 FontSizeConverter_Csharp
  Public Partial Class Window1
    Inherits Window
    Public Sub changeSize(sender As Object, args As SelectionChangedEventArgs)
      Dim li As ListBoxItem = TryCast(TryCast(sender, ListBox).SelectedItem, ListBoxItem)
      Dim myFontSizeConverter As New FontSizeConverter()
      text1.FontSize = CType(myFontSizeConverter.ConvertFromString(li.Content.ToString()), [Double])
    End Sub

    Public Sub changeFamily(sender As Object, args As SelectionChangedEventArgs)
      Dim li2 As ListBoxItem = TryCast(TryCast(sender, ListBox).SelectedItem, ListBoxItem)
      text1.FontFamily = New System.Windows.Media.FontFamily(li2.Content.ToString())
    End Sub
  End Class
End Namespace

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Use the FontSizeConverter class to convert the content of a ListBoxItem to a value that represents the size of a font. : ListBox « Windows Presentation Foundation « VB.Net

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