CODEWITHSUNDEEP
c#wpfdata-bindingmvvmmvvm-light
Emily
Emily

Reputation: 256

WPF Call function on item select (with MVVM paradigm)

I have a ListBox that is bound to an ObservableCollection of Customers. The XAML code for this is:

<ListBox x:Name="lb_Customers" Height="683" ItemsSource="{Binding Path=Customers, UpdateSourceTrigger=PropertyChanged}">
     <ListBox.ItemTemplate>
          <DataTemplate>
               <Label Margin="0,0,0,0" Padding="0,0,0,0" Content="{Binding Name}" />
          </DataTemplate>
      </ListBox.ItemTemplate>
</ListBox>

This points over to some code in my MainViewModel class:

public ObservableCollection<Customer> Customers
{
    get { return _customers; }
    set
    {
        Set("Customers", ref _customers, value);
        this.RaisePropertyChanged("Customers");
    }
}

When I select a customer in this listbox, I'd like to execute some code that goes and compiles the customer's order history.

However, I have no idea how to do this using DataBinding/CommandBinding.

My question: where do I even begin?

Upvotes: 0

Views: 2721

Answers (2)

EtherDragon
EtherDragon

Reputation: 2698

As Tormond suggested:

Change

<ListBox x:Name="lb_Customers" Height="683" ItemsSource="{Binding Path=Customers, UpdateSourceTrigger=PropertyChanged}">

to

<ListBox x:Name="lb_Customers" Height="683" ItemsSource="{Binding Path=Customers, UpdateSourceTrigger=PropertyChanged}", SelectedValue="{Binding SelectedCustomer}">

Then in your ViewModel add:

private Customer _selectedCustomer;
public Customer SelectedCustomer
{
    get {}
    set
    {
        if (_selectedCustomer != value)
        {
            Set("SelectedCustomer", ref _selectedCustomer, value);
            this.RaisePropertyChanged("SelectedCustomer");

            // Execute other changes to the VM based on this selection...
        }
    }
}

Upvotes: 1

Tormod
Tormod

Reputation: 4573

You can add a "currentlyselected" object to your viewmodel and bind it against "SelectedItem" property of the listbox. Then do your desired actions in the "set" accessor.

Upvotes: 1

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