CallDataMethod trigger in Xamarin Forms

Here’s a very simple implementation of a CallDataMethod trigger in Xamarin Forms:

    public class CallDataMethod: TriggerAction<VisualElement>
    {
        public string Method { get; set; }

        #region implemented abstract members of TriggerAction

        protected override void Invoke (VisualElement sender)
        {
            MethodInfo method = sender.GetType ().GetRuntimeMethod (Method, new Type[0]);
            if (method != null) {
                ParameterInfo[] parameters = method.GetParameters ();
                if (parameters.Length == 0)
                    method.Invoke (sender, null);
            }
        }

        #endregion
    }

For a demo, let’s say we have two text-boxes (Entry control in Xamarin Forms) and you want to enable the second one when the first has ten characters:

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:controls="clr-namespace:Xamore.Controls;assembly=Xamore.Controls"
    x:Class="Xamore.Controls.TestApp.Views.CallDataMethodPage">
    <StackLayout>
        <Entry x:Name="FirstEntry"
               WidthRequest="100" />
        <Entry IsEnabled="false"
               WidthRequest="100">
            <Entry.Triggers>
                <DataTrigger TargetType="Entry"
                             Binding="{Binding Source={x:Reference FirstEntry}, Path=Text.Length}"
                             Value="10">
                    <Setter Property="IsEnabled"
                            Value="True" />
                    <Trigger.EnterActions>
                        <controls:CallDataMethod Method="Focus" />
                    </Trigger.EnterActions>
                </DataTrigger>
            </Entry.Triggers>
        </Entry>
    </StackLayout>
</ContentPage>