Conection MVVM Light with SelectionChanged - binding

Question

I'm creating app in UWP and i have question.
Can I somehow connection MVVM Light with SelectionChanged event (e.g. ListView) or with other event?
I would like that when I will click on some Item in ListView then I call SelectionChanged.
How do I do?

Answer 1

You can write the Method in ViewModel ,and use the x:bind to connection ViewModel.
The MVVMLight's method is use in WPF that cant bind the event in Method.
UWP can use x:bind to bind the UI event to ViewModel.
The sample:
XAML:
<ListView SelectionChanged = "{x:bind view.SelectionChanged }"/>
XAML.cs:
private ViewModel View{set;get;}
ViewModel:
public void SelectionChanged()
{
}
You can use ItemClick event that will run when you click the ListViewItem .

Answer 2

Inside your viewmodel something *.cs
public class RelayCommand : ICommand
{
private Predicate<object> _canExecute;
private Action<object> _execute;
public RelayCommand(Predicate<object> canExecute, Action<object> execute)
{
this._canExecute = canExecute;
this._execute = execute;
}
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
public bool CanExecute(object parameter)
{
return _canExecute(parameter);
}
public void Execute(object parameter)
{
_execute(parameter);
}
}
public class MyViewModel
{
private ICommand _doSelectionChangedCommand;
public ICommand DoSelectionChangedCommand
{
get
{
if (_doSelectionChangedCommand == null)
{
_doSelectionChangedCommand = new RelayCommand(
p => this.CanSelectionChanged,
p => this.DoSomeImportantMethod());
}
return _doSomething;
}
}
}
In your viewSomemthing.xaml
--For namespace
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
--Then go down to your control, we'll use Combobox as an example
<ComboBox ... />
<i:Interaction.Triggers>
<EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding DoSelectionChangedCommand}"/>
</EventTrigger>
</i:Interaction.Triggers>
</ComboBox>