How to define an constructor argument accessible from Xaml

Question

Xamarin\'s ListView defines a 1-argument constructor as follows:

public ListView([Parameter(\"CachingStrategy\")] ListViewCachingStrategy cachin         


        

Answer 1

To make things simpler, I would recommend creating a BindableProperty for IsReadOnly. But you can always use x:Arguments to pass in parameters to constructor:

<local:ItemListControl ...>
    <x:Arguments>
        <x:Boolean>true</x:Boolean>
    </x:Arguments>
</local:ItemListControl>

EDIT - 1

There is one hack that you can use - (I wouldn't recommend as this could change anytime with an update in XAMLC compilation) - but you can make sure to keep the namespace same as the one used internally while defining the parameter attribute.

namespace Xamarin.Forms
{
    [AttributeUsage(AttributeTargets.Parameter)]
    internal sealed class ParameterAttribute : Attribute
    {
        public ParameterAttribute(string name)
        {
            Name = name;
        }

        public string Name { get; }
    }
}

And XAML usage would look like:

<local:ItemListControl IsReadOnly="true" .. />

EDIT - 2 This hack only seems to work if XAMLCompilation is applied to host control/page.