how to get the selected object in a listbox ---wpf

Question

i have three listboxes, whose itemsSource is binded to a list, list and dictionary. i want to add the selected user and selected book to the dictionary with a command but i can't take the selected items. i am trying to obey the mvvm. i have a booklist and a userlist in my viewmodel which are binded to the given listboxes in my view. i couldn't send the selected items to my viewmodel. how can i do this? thanks for helping in advance.

Answer 1

Just bind a property to SelectedItem:

<ListBox 
  ItemsSource="{Binding Books}" 
  SelectedItem="{Binding SelectedBook}"/>

And in the ViewModel

public class Library : INotifyPropertyChanged
{
  public ObservableCollection<Book> Books {get;private set;}
  public Book SelectedBook {get;set;}
}

Answer 2

In your viewModel, couldn't you create a SelectedBook and a SelectedUser and bind those to the SelectedItem of your ListBoxes? Then, when they change, add them to your dictionary.

Answer 3

You can also use standard binding syntax using a slash (/).

{Binding Books/}

will allow you to bind directly to the current item in a collection.