CODEWITHSUNDEEP
c#buttonuwpframenavigationview
DavidSNB
DavidSNB

Reputation: 181

How to make changes to objects in the page above

I have a NavigationView that loads a page into its associated frame.

On the loaded page there is a button, how can I use this button to change the properties of the NavigationView.

I know that to update the page in the frame is:

Frame.Navigate(typeof(Window2));

So I thought it might be:

Frame.NavigationView.IsEnabled = False

But this isn't valid.

Is there a way to do this?

Upvotes: 0

Views: 75

Answers (1)

Faywang - MSFT
Faywang - MSFT

Reputation: 5868

You can not set NavigationView.IsEnabled directly from loaded page.You can set a property in a viewmodel to bind with the IsEnabled of navigationView.When you navigate a new page by Frame.Navigate(),pass the viewmodel to the new page.You can set the property to false when you click the button in the page.In this case,the navigationView will be disabled.

.xaml:

<NavigationView IsEnabled="{x:Bind MyViewModel.IsEnabled,Mode=OneWay}">
        <NavigationView.MenuItems>
            <NavigationViewItem Content="Item 1"></NavigationViewItem>
        </NavigationView.MenuItems>
        <Frame x:Name="ContentFrame"/>
</NavigationView>

.cs:

public class ViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };

    private bool isEnabled = false;
    public bool IsEnabled {
        get { return isEnabled; }
        set {
            isEnabled = value;
            OnPropertyChanged();
        }
    }
    public void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

public sealed partial class MainPage: Page
{​
    public MainPage()​
    {​
        this.InitializeComponent();​
        MyViewModel = new ViewModel();
    }
    private ViewModel MyViewModel { get; set; }
}

When you want to navigate a new page,pass the viewmodel:

ContentFrame.Navigate(typeof(Page1),MyViewModel);

Page1.cs:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    base.OnNavigatedTo(e);
    isEnabledVM = (e.Parameter as ViewModel);
}
private ViewModel isEnabledVM { get; set; }
private async void Button_Click(object sender, RoutedEventArgs e)
{
    isEnabledVM.IsEnabled = false;
}

Upvotes: 1

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