Binding to a method with parameter in XAML using polymorphism in ViewModel

Question

I have a TabControl with six tabs in my ResultView. The ViewModel that sits behind this View can be either a ResultTypeOneViewModel or ResultTypeTwoViewModel, each of which deri

Answer 1

You can use an indexer property to be able to pass a single parameter to a property. Although it's probably not very intuitive to return a boolean value from an indexer property it works fine for me. Also keep in mind the indexer property looses it's expected functionality.

    class MyClass
    {
        public bool this[int tabNumber]
        {
            get
            {
                // Do logic to determine visibility here or in a separate method
                return IsTabVisible(tabNumber);
            }
        }

        bool IsTabVisible(int tabNumber)
        {
            bool result;

            // Method logic...

            return result;
        }
    }

So in XAML you can use the class name and provide a parameter between square brackets.

If you need to raise a NotifyPropertyChanged for the indexer property use:

    NotifyPropertyChanged("Item[]");

I don't know if this fits into the MVVM pattern but it could be useful for anyone who wants to bind to a method with a single parameter.