How do I pass the Button as CommandParameter from XAML in a Xamarin.Forms Page?

Question

I would like to pass a Xamarin.Forms.Button in it's own Command as the CommandParameter to my ViewModel. I know how to achieve this from the code behind e.g. ...

XAML (with most properties missed out for brevity)

<Button x:Name="myButton"
    Text="My Button"
    Command="{Binding ButtonClickCommand}"/>

XAML.cs

public partial class MyTestPage
{
    public MyTestPage()
    {
        InitializeComponent();

        myButton.CommandParameter = myButton;
    }
}

ViewModel

public class MyViewModel : ViewModelBase
{
    public MyViewModel()
    {
        ButtonClickCommand = new Command(
            (parameter) =>
            {
                var view = parameter as Xamarin.Forms.Button;
                if (view != null)
                {
                    // Do Stuff
                }
            });
    }

    public ICommand ButtonClickCommand { get; private set; }
}

... BUT is it possible to declare the CommandParameter in the XAML itself? Or in other words what is the binding syntax to set the parameter to the button itself?

<Button x:Name="myButton"
        Text="My Button"
        Command="{Binding ButtonClickCommand}"
        CommandParameter="{[WHAT WOULD GO HERE]}"/>

btw I've already tried CommandParameter="{Binding RelativeSource={RelativeSource Self}}" and that didn't work.

Thanks,

Answer 1

Xamarin.Forms has a Reference markup extension that does just that:

<Button x:Name="myButton"
    Text="My Button"
    Command="{Binding ButtonClickCommand}"
    CommandParameter="{x:Reference myButton}"/>

Although, this is the first time I'm seeing this need, and you probably can better separate your Views from your ViewModels and solve this by using a cleaner pattern, or by not sharing a command across buttons.

Answer 2

 <Button x:Name="myButton"
        Text="My Button"
        Command="{Binding ButtonClickCommand}"
        CommandParameter="{x:Reference myButton}"/>

In your ViewModel

public YourViewModel()
{
    ButtonClickCommand= new Command(ButtonClicked);
}

private async void ButtonClicked(object sender)
{
    var view = sender as Xamarin.Forms.Button;
}