Passing two parameters in CommandParameter in Xamarin Forms

Question

I have defined a model as follows:

public class UserDetails
{
    public int Id { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public List<Transport> TransportModel { get; set; }
}

Based on the above model, I have instantiated a list that contains hard coded values for testing purposes.

Further, I am dynamically populating buttons based on the TransportModel values on a XAML page as follows:

        StackLayout stack = new StackLayout();

        foreach (var t in user.TransportModel)
        {
// Here I am looping to access data in the TransportModel
            Button btn = new Button();
            btn.Text = t.Name;
            btn.SetBinding(Button.CommandProperty, new Binding("ShowCommandParameter"));
            btn.CommandParameter = user.TransportModel; // if this correct ?
            stack.Children.Add(btn);
        }

And I have the following ViewModel:

 public TransportViewModel()
        {
            ShowCommandParameter = new Command<UserDetails>(Show);
        }

        public void Show(UserDetails param)
        {
        // I want to access properties of TransportModel here..
        }

The issue that I am having is that I want to pass two parameters in the CommandParameter. And I want to access these values within the Show method.

Could someone please help me on this ? I'm totally stuck.

you should only need to pass a UserDetails object as the parameter, it has all of the data you need — Jason
– Jason, Commented Jan 18, 2018 at 16:12
@Jason : Is this correct : btn.CommandParameter = t; ? Then how do I access it within the method Show ? — ExpertGenie
– ExpertGenie, Commented Jan 18, 2018 at 16:14

Jason · Accepted Answer · 2018-01-18 16:27:01Z

2

since each button only applies to a specific Transport, you want to pass a Transport object as your CommandParameter

foreach (var t in user.TransportModel)
{
  ...
  btn.CommandParameter = t;
  ...
}

then

    public TransportViewModel()
    {
        ShowCommandParameter = new Command<Transport>(Show);
    }

    public void Show(Transport param)
    {
        // param contains the selected Transport
    }

answered Jan 18, 2018 at 16:27

Jason

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1 Comment

ExpertGenie Over a year ago

Thanks a tons brother. You are always helpful :)

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