I am using RelayCommand to handle a button click, I need to get the sender parameter but it is always null, any idea why?
ViewModel.cs
private RelayCommand _expandClickCommand;
public ICommand ExpandClickCommand
{
get
{
if (_expandClickCommand == null)
{
_expandClickCommand = new RelayCommand(ExpandClickCommandExecute, ExpandClickCommandCanExecute);
}
return _expandClickCommand;
}
}
public void ExpandClickCommandExecute(object sender)
{
//sender is always null when i get here!
}
public bool ExpandClickCommandCanExecute(object sender)
{
return true;
}
View.xaml
<ListBox ItemsSource="{Binding Path=MyList}">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Grid.Column="0" Grid.Row="0" Content="Expand" Command="{Binding DataContext.ExpandClickCommand,ElementName=SprintBacklog}"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I need to get the index of the currect ListboxItem in ExpandClickCommand