CODEWITHSUNDEEP
c#wpfmvvm
VansFannel
VansFannel

Reputation: 45911

Access a ViewModel from another ViewModel

I'm developing an WPF using MVVM pattern, C# and .NET Framework 4.6.1.

I have a Window that contains an UserControl (Control1) and that UserControl contains another UserControl (Control2). I have chosen this way to do it instead of using a Dialog Window (Control2 acts as Dialog Window).

Both user controls have a Viewmodel (Control1VM and Control2VM).

I use Control2 as a form to let users input some data that I need to start the application.

This is the MainWindow with Control1:

enter image description here

And this is Control2 over Control1.

enter image description here

My problem is that I don't know how to hide Control2 when I click on OK or Cancel button.

This is how Control2 is set on Control1:

<Grid x:Name="gridControl2" Margin="30" Grid.RowSpan="6" Grid.ColumnSpan="3" Visibility="{Binding GridControl2Visibility}">
    <local:Control2 x:Name="userControlControl2" />
</Grid>

To show Control2 and set GridControl2Visibility to Visible in Control1VM:

public Visibility GridControl2Visibility
{
    get { return gridControl2Visibility; }
    set
    {
        if (gridControl2Visibility != value)
        {
            gridControl2Visibility = value;

            RaisePropertyChangedEvent("GridControl2Visibility");
        }
    }
}

How can I hide Control2 when I click on Ok or Cancel button in Control2? My problem is that GridControl2Visibility is on Control1VM and I can't access that class from Control2VM.

Upvotes: 0

Views: 1933

Answers (2)

Haukinger
Haukinger

Reputation: 10863

Use a service that both view models can access and that stores the info whether Control2 should be visible or not. Ideally, the service would be registered as singleton with your di-container and injected into the view models.

Alternatively, you can use an event aggregator, which is basically a singleton service, too, but focused on distributing events rather than holding a state.

Upvotes: 1

Pratik Parikh
Pratik Parikh

Reputation: 158

You can use events, You can raise event from Control2VM and hadnle it in Control1VM and set GridControl2Visibility to false.

Upvotes: 0

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