mvvm Pass button click to parent

Question

Note: this is a different question to the one here: Pass dependency property to child view

I am currently creating a usercontrol in wpf which consists of several 'screens' that the user will click through.

For each 'screen' I have created a view with it's own viewmodel (e.g. View1.xaml, View2.xaml). The main usercontrol can then access these views:

<UserControl.Resources>
    <local:ModuleBaseViewModel x:Key="ViewModelDataSource" />
</UserControl.Resources>

<Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource ViewModelDataSource}}">
    <local:View1 Visibility="Visible"/>
    <local:View2 Visibility="Hidden"/>
</Grid>

I would like to pass a button click from a view back down to the parent usercontrol so that I can hide that view and show the next one. Can someone explain to me how to do this?

Thanks!

You need to create an event in each view that is fired when the button is clicked, like OnButtonClicked, then your user control can register to the event — musefan

Josh Josh · Accepted Answer · 2014-02-05T15:48:23

If you are using MVVM and WPF, chances are you are using an IoC container. Almost every IoC container contains a method of publishing an event and then subscribing to that event. In Prism, the code looks something like this:

EventAggregator.GetEvent<SomeEvent>().Publish(ParametersHere)

I would suggest you look at your options for publishing events and reacting to them. Then your parent view model can respond to the children's events.

mvvm Pass button click to parent

1 Answers