将命令与参数绑定

Question

In my Xamarin iOS project, I want to bind a button to a ICommand with a parameter.

View:

var set = this.CreateBindingSet<MyView, MyViewModel>();
set.Bind(Button1).To(vm => vm.EditCommand).WithConversion(new MvxCommandParameterValueConverter(), 1);
set.Apply();

ViewModel:

private readonly ICommand editCommand;
public MyViewModel()
{
   editCommand = new BaseMvxCommand<int>(DoEditPhoto);
}

public ICommand EditCommand { get { return editCommand; } }
private void DoEditPhoto(int imageNum)
{
    // enter code here
}

When I hit the button, I am not able to execute the DoEditPhoto() . Am I binding in a wrong way? Can anyone help me out?

Answer 1

Yes your binding is technically not wrong. However, you don't need a converter to pass a parameter to a bound ICommand . For this you can use CommandParameter in your chain instead:

set.Bind(Button1).To(vm => vm.EditCommand).CommandParameter(ViewModel.ImageNumber);