範例
此範例示範如何創造建立 ThicknessConverter 執行個體並使用來變更框線的粗細。
此範例會定義稱為 changeThickness 的自訂方法；這個方法會先將 ListBoxItem 的內容，如個別的 Extensible Application Markup Language (XAML) 檔案中所定義，轉換為 Thickness 的執行個體，稍後會將內容轉換成 String。 這個方法會將 ListBoxItem 傳遞至 ThicknessConverter 物件，此物件會將 ListBoxItem 的 Content 轉換成 Thickness 的執行個體。 接著，這個值會當做 Border 的 BorderThickness 屬性值傳回。
此範例不會執行。
private void changeThickness(object sender, SelectionChangedEventArgs args)
{
ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
ThicknessConverter myThicknessConverter = new ThicknessConverter();
Thickness th1 = (Thickness)myThicknessConverter.ConvertFromString(li.Content.ToString());
border1.BorderThickness = th1;
bThickness.Text = "Border.BorderThickness =" + li.Content.ToString();
}
Private Sub changeThickness(ByVal sender As Object, ByVal args As SelectionChangedEventArgs)
Dim li As ListBoxItem = CType(CType(sender, ListBox).SelectedItem, ListBoxItem)
Dim myThicknessConverter As System.Windows.ThicknessConverter = New System.Windows.ThicknessConverter()
Dim th1 As Thickness = CType(myThicknessConverter.ConvertFromString(li.Content.ToString()), Thickness)
border1.BorderThickness = th1
bThickness.Text = "Border.BorderThickness =" + li.Content.ToString()
End Sub
