CODEWITHSUNDEEP
c#windows-phone-7windows-phone-8listbox
Newbie
Newbie

Reputation: 1180

Can't Remove a StackPanel by Name from a ListBox in C#

I'm trying to remove an item from a ListBox using the following code:

listBox.Items.Remove(stackPanelName);

I don't get any errors, but neither do I get any visible results.

Does anyone know what I am doing wrong?

Upvotes: 4

Views: 122

Answers (2)

keyboardP
keyboardP

Reputation: 69372

I wouldn't recommend trying to remove items from the ListBox directly (I'm surprised an error isn't thrown as listBox.Items returns a read-only collection so calling Remove on it shouldn't be possible, unless I'm mistaken). Either way, you should be focusing on managing the backing collection.

For example, if you store your items in an ObservableCollection it will automatically notify the UI (ListBox in this case) that an item was removed and will update the UI for you. This is because ObservableCollection implements the INotifyPropertyChanged and INotifyCollectionChanged interfaces by default and so when something in the collection changes, it's fires an event that tells the UI control to update.

Upvotes: 1

p.s.w.g
p.s.w.g

Reputation: 149030

You can do something like this:

var stackPanelItem = listBox.Items.OfType<FrameworkElement>()
                            .First(x => x.Name == stackPanelName);
listBox.Items.Remove(stackPanelItem);

This will fail if there is no item with that name in the listBox.Items collection. You might want to do this to be a bit safer:

var stackPanelItem = listBox.Items.OfType<FrameworkElement>()
                            .FirstOrDefault(x => x.Name == stackPanelName);
if (stackPanelItem != null)
{
    listBox.Items.Remove(stackPanelItem);
}

Upvotes: 1

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