The fact is that ListBox.Items is a plain object collection and returns plain untyped objects, which cannot be multi-selected (by default). If you want to multi-select all items, then this will work: for (int i = 0; i < myListBox.Items.Count;i++) { myListBox.SetSelected(i, true); }
You can use ItemContainerStyle: <ListBox> <ListBox.ItemContainerStyle> <Style TargetType=”{x:Type ListBoxItem}”> <Style.Triggers> <DataTrigger Binding=”{Binding YourPropertyName}” Value=”False”> <Setter Property=”IsEnabled” Value=”False”/> </DataTrigger> </Style.Triggers> </Style> </ListBox.ItemContainerStyle> </ListBox>
I pasted your code into test project, added about 20 items and I get usable scroll bars, no problem, and they work as expected. When I only add a couple items (such that scrolling is unnecessary) I get no usable scrollbar. Could this be the case? that you are not adding enough items? If you … Read more
I have a Listbox bound to an object property which is of type List<MyCustomType>() and I verified that the following code updates the listbox when the List is updated. void On_MyObjProperty_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { MyListBox.Items.Refresh(); } If you’re still facing issues, scan the VS IDE output window (Ctrl+W, O) and see if you can … Read more
In Python, a list is a dynamic array. You can create one like this: lst = [] # Declares an empty list named lst Or you can fill it with items: lst = [1,2,3] You can add items using “append”: lst.append(‘a’) You can iterate over elements of the list using the for loop: for item … Read more
Less code solution: <Button Name=”button1″ IsEnabled=”{Binding ElementName=listBox1, Path=SelectedItems.Count}” /> If count is 0 that seems to map to false, > 0 to true.
The ListBox contains a HasItems property you can bind to. So you can just do this: <BooleanToVisibilityConverter x:Key=”BooleanToVisibility” /> … <ListBox Visibility=”{Binding HasItems, RelativeSource={RelativeSource Self}, Converter=BooleanToVisibility}” /> Or as a Trigger so you don’t need the converter: <ListBox> <ListBox.Style> <Style TargetType=”{x:Type ListBox}”> <Setter Property=”Visibility” Value=”Visible” /> <Style.Triggers> <DataTrigger Binding=”{Binding HasItems, RelativeSource={RelativeSource Self}}” Value=”False”> <Setter Property=”Visibility” … Read more
The easiest way to solve this is to ensure that your Listbox has a ItemContainerStyle. See the following example: <ListBox x:Name=”RecentItemsListBox” Grid.Row=”1″ BorderThickness=”0″ Margin=”2,0,0,0″ SelectionChanged=”RecentItemsListBox_SelectionChanged”> <ListBox.ItemContainerStyle> <Style TargetType=”{x:Type ListBoxItem}”> <Setter Property=”HorizontalContentAlignment” Value=”Left”/> <Setter Property=”VerticalContentAlignment” Value=”Center”/> </Style> </ListBox.ItemContainerStyle> … </ListBox> What happens is that your Items are being created, and by default they look for parent’s … Read more
isn’t the same as the Winform and Webform way? listBox1.Items.Clear();
If you want to retrieve the display text of the item, use the GetItemText method: string text = listBox1.GetItemText(listBox1.SelectedItem);