MvvmCross bind command with parameter in Windows Phone

Question

i am currently working on a simple app developped with Xamarin and MvvmCross. I have a simple list of items and i want a click on an item open a new view.

I managed to do that in Android with :

this code in the .axml of the view

ListCustomersView.xaml

<MvxListView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        local:MvxItemTemplate="@layout/listcustomerscell"
        local:MvxBind="ItemsSource ListCustomers; ItemClick ShowCommand"
        android:id="@+id/listCustomersView" />

and this code in the ViewModel file :

ListCustomersViewModel.cs

private MvxCommand<CustomerListDTO> _showCommand;
public ICommand ShowCommand
{
     get { return _showCommand ?? (_showCommand = new MvxCommand<CustomerListDTO>(c => this.ShowCustomerDetail(c))); }
}

public void ShowCustomerDetail(CustomerListDTO c)
{
    ShowViewModel<CustomerDetailViewModel>(new CustomerDetailParameters() { CustomerID = c.Id });
}

As you can see, i send a parameter through the command : an instance of the CustomerDetailParameters class. It works well in Android, but i do not manage to do that in Windows Phone.

I m using this code in the ListCustomersView.xaml :

<ListBox Name="listBox" ItemsSource="{Binding ListCustomers}">
        <ListBox.ItemContainerStyle>
            <Style TargetType="ListBoxItem">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            </Style>
        </ListBox.ItemContainerStyle>
        <ListBox.ItemTemplate>
            <DataTemplate>
                <controls:ListCustomersCell />
            </DataTemplate>
        </ListBox.ItemTemplate>
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="SelectionChanged">
                <i:InvokeCommandAction Command="{Binding ShowCommand}"/>
            </i:EventTrigger>
        </i:Interaction.Triggers>
</ListBox>

The ShowCommand is well called but the CustomerListDTO which should be sent is null. I imagine i am not using the good code. If you have any idea, i will take them.

Thanks for any help and have a good day !

Answer 1

Command paramter is not passed to the command. Try below code by passing CommandParameter to the VM

CommandParameter="{Binding ElementName=listBox, Path=SelectedItem}