[SOLVED] Unable to cast object of type ‘Xamarin. Forms. Xaml. ElementNode’ to type ‘Xamarin. Forms. Xaml. ValueNode’.

When writing XAML for Xamarin Forms, you may across the error:

Unable to cast object of type 'Xamarin.Forms.Xaml.ElementNode' to type 'Xamarin.Forms.Xaml.ValueNode'

This is nearly always caused by assigning a value to an event in XAML, instead of specifying a method name.

A common example is:

<Switch Toggled="{Binding IsToggled}" />

Toggled is the name of an event. The property that was probably intended is called IsToggled.

<Switch IsToggled="{Binding IsToggled}" />