How to determine which data form button completed editing when using EventToCommand

Question

I am new to SilverLight and Mvvm-Light. I have a DataForm on my view that displays / edits the SelectedPerson property (Person object) of my view model.

I want to execute a command on my view model when the user clicks the Save button, but doesn’t want to take action if the user clicks the Cancel button.

I added the following to my ViewModel:

public RelayCommand PersonEditEnded {get; set;}
...
public void Initialize()
{
  PersonEditEnded = new RelayCommand(DoSomething);
  ...
}

public void DoSomething()
{
}

I added the following to my view:

<toolkit:DataForm x:Name="PersonForm" ... CurrentItem="{Binding SelectedPerson, Mode=TwoWay}">
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="EditEnded">
      <gs:EventToCommand Command="{Binding PersonEditEnded, Mode=OneWay}"/>
    </i:EventTrigger>
  </i:Interaction.Triggers>
</toolkit:DataForm>

This works, and the DoSomething method is called when the user clicks Submit. However, DoSomething is also called when the user clicks Cancel. Is there a way to find out which button was pressed or to suppress a call when the Cancel button is pressed?

, !

Answer 1

, , DataFormEditEndedEventArgs EditAction. DataFormEditAction Commit, Cancel.

: PassEventArgsToCommand ( EventToCommand) True. ViewModel RelayCommand. , -

e =>
{
    if (e.CommitAction == DataFormEditAction.Commit)
    {
        DoSomething();
    }
}

, ,

Answer 2

, CurrentItem ( ), , .