Button inside a WPF List view/data grid - wpf

Question

I am trying to get the value/ID of the clicked row. If the row is selected, this works fine. But if I just try to click the button inside, the selected customer is null. How do I do Command Parameters here.
I tried this see the answers to the following questions:
ListView and Buttons inside ListView
WPF - Listview with button
Here is the code:
<Grid>
<ListView ItemsSource="{Binding Path=Customers}"
SelectedItem="{Binding Path=SelectedCustomer}"
Width="Auto">
<ListView.View>
<GridView>
<GridViewColumn Header="First Name">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel Margin="6,2,6,2">
<TextBlock Text="{Binding Name}"/>
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Address">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel Margin="6,2,6,2">
<Button Content="Address" Command="{Binding Path=DataContext.RunCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}"/>
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
public class VM : ViewModelBase
{
public RelayCommand RunCommand { get; private set; }
private ObservableCollection<Customer> _Customers;
public ObservableCollection<Customer> Customers
{
get { return _Customers; }
set
{
if (value != _Customers)
{
_Customers = value;
RaisePropertyChanged("Customers");
}
}
}
private Customer _SelectedCustomer;
public Customer SelectedCustomer
{
get { return _SelectedCustomer; }
set
{
if (value != _SelectedCustomer)
{
_SelectedCustomer = value;
RaisePropertyChanged("SelectedCustomer");
}
}
}
public VM()
{
Customers = Customer.GetCustomers();
RunCommand = new RelayCommand(OnRun);
}
private void OnRun()
{
Customer s = SelectedCustomer;
}
}
in the OnRun Method, selected Customer is coming in as null. I want the data row(customer) here. How do I do this?

Answer 1

Three possible solutions that you can choose.
Pass current row object as a CommandParameter. In this case, you will modify OnRun method a little. (recommended)
<Button Content="Address" Command="{Binding Path=DataContext.RunCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" CommandParameter={Binding} />
I think CommandParameter={Binding} works fine because the DataContext of each row is each Customer object.
and OnRun method needs to be modified in order to get a parameter as an argument.
private void OnRun(object o){
if(!(o is Customer)) return;
// Do something
}
Or, Write a little code-behind with SelectionChanged event handling. (not recommended)
Or, Use EventToCommand in MVVM-light toolkit. (not recommended)

Answer 2

CommandParameter does NOT entirely support data binding.
http://connect.microsoft.com/VisualStudio/feedback/details/472932/wpf-commandparameter-binding-should-be-evaluated-before-command-binding