question

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Firstly take a look at Bindable Layouts in Xamarin.Forms .

Bindable layouts enable any layout class that derives from the Layout<T> class to generate its content by binding to a collection of items .

BindableLayout exposes the attached properties (including ItemsSource ,ItemTemplate) .

The usage is pretty simple

<StackLayout BindableLayout.ItemsSource="{Binding User.TopFollowers}"
             Orientation="Horizontal"
             ...>
    <BindableLayout.ItemTemplate>
        <DataTemplate>
            <controls:CircleImage Source="{Binding}"
                                  Aspect="AspectFill"
                                  WidthRequest="44"
                                  HeightRequest="44"
                                  ... />
        </DataTemplate>
    </BindableLayout.ItemTemplate>
</StackLayout>

Note : While it's technically possible to attach a bindable layout to any layout class that derives from the Layout<T> class, it's not always practical to do so, particularly for the AbsoluteLayout, Grid, and RelativeLayout classes.

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 public static readonly BindableProperty ValuesProperty= BindableProperty.Create(nameof(ElectricityValues),
             typeof(List<Models.Equipments.TimeAndCurrent>),
             typeof(PoChart),
             new List<Models.Equipments.TimeAndCurrent>(),
              BindingMode.OneWay,
              propertyChanged: OnPropertyChanged);