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If I use ContentPage.BindingContext in XAML to define my binding context then how do I access that in the C# back end?

In my XAML I define the binding context like this:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:Japanese;assembly=Japanese"
             xmlns:template="clr-namespace:Japanese.Templates"
             xmlns:viewModels="clr-namespace:Japanese.ViewModels; assembly=Japanese"
             x:Class="Japanese.Cards" Title="Binding Title">
<ContentPage.BindingContext>
     <viewModels:CardsViewModel />
    </ContentPage.BindingContext>
</ContentPage>


What I would like to know is how can I access this context in my C# back end.

public partial class Cards : ContentPage
{

public Cards()
    
     InitializeComponent();
        NavigationPage.SetBackButtonTitle(this, "Back");
    

    protected override void OnAppearing()
    {
     // I want to set some properties of the view here


1 Answer
1

It seems you cannot give it an x:Name attribute like other elements in your XAML. In that case, your options are limited to declaring the object for your binding context in the code-behind, or referencing it from the BindingContext property.

x:Name

BindingContext

For the latter approach, do it like this:

protected override void OnAppearing()

var cardsViewModel = BindingContext as CardsViewModel;

if (cardsViewModel == null)
return;

cardsViewModel.Property = Value;



Earlier answer for reference:

You should be able to give it a name like so:

<ContentPage.BindingContext>
<viewModels:CardsViewModel x:Name="cardsViewModel" />
</ContentPage.BindingContext>


This will effectively just create a declaration like this in generated code:

private CardsViewModel cardsViewModel;


You can now access it in your code-behind:

protected override void OnAppearing()

cardsViewModel.Property = Value;



x:Name

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