Question

I have a ListBox called NotesList. I have an ObservableCollection called noteList, and I have a TextBox called NoteContents.

In my ObservableCollection, I set the Filename and Contents properties for a few items and then it gets added (bound) to my ListBox.

But now, I want to (when I click a button), show the “Contents” of the ListBox Item that was selected in the NoteContents TextBox.

How can I do this?

I currently have:

private void NotesList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    NoteContents.Text = noteList.Where(x => x.Filename.Contains(NotesList.SelectedValue.ToString())).FirstOrDefault().Contents;
}

Answer 1

You can do this without button clicks, just binding like:

<ListBox Name="NotesList" ItemsSource="{Binding YourObservableCollection}">
    <!--Your bindings here-->
</ListBox>
<TextBox Text="{Binding ElementName=NotesList, Path=SelectedItem.Contents}" />