using databinding in codebehind

Question

I have a page where I bind a command to a button. When I click it I calls a method where I get the data I want from an API.What if I don't want to only bind the data at the view but also use these data in code behind?! Lets say this is my view :

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         x:Class="HelloWorld.Pages.JohnDoePage"
         xmlns:local="clr-namespace:Xamarin.Forms.Maps;assembly=Xamarin.Forms.Pages"
         xmlns:vm="clr-namespace:HelloWorld.ViewModel;assembly=HelloWorld">
   <StackLayout Padding="20, 10" HorizontalOptions="Center">
                <Button Command="{Binding JohnDoe}"
                Text="Data about John Doe" />
   </StackLayout>
</ContentPage>

the code behihnd :

    Models.Info info;
    public JohnDoePage(Models.Info info)
    {
        InitializeComponent();
        BindingContext = new InfoDetailsViewModel(info);
        this.info= info;

     // i want to use the data here 
     //using the data
     }

the view model :

     Data _data;
    public Data Data
    {
        get { return _data; }
        set
        {
            if (value == _data) return;
            _data = value;
            OnPropertyChanged();
        }
    }
    public ICommand JohnDoe
    {
        get
        {
            return new Command(async () =>
            {
                var Dataa = await _apiServices.InfoAboutJohnDOe();
            });
        }
    }

and the service where I get the data I need is OK. I'm using the same viewmodel for binding different commands, and I don't know if this is possible by the way so I'm stuck. Any idea how can I use the data I get in the view code-behind?? Thanks in advance!!

Answer 1

why not just maintain a class level reference to your VM?

Models.Info info;
InfoDetailsViewModel vm;

public JohnDoePage(Models.Info info)
{
    InitializeComponent();
    vm = new InfoDetailsViewModel(info);
    BindingContext = vm;
    this.info= info;
 }

Answer 2

Save the result of your Service call as a public property

public <TargetType> Dataa { get; set; }

and save the DataContext of your JohnDoePage as a member.

JohnDoePageViewModel dataContext = (JohnDoePageViewModel)this.DataContext;

Because then you are able to get the information from the ViewModel.

var data = dataContext.Dataa;

Does this help?