ViewModel<T> constructor with no parameter and public ApplicationContext?

[michaelcsikos]

I'm hoping to write some more generic classes to reduce the disappointing amount of repetition I have, particularly with ViewModel wrapping BusinessListBase collections. I've hit a snag with the ApplicationContext:

    public abstract class ViewModelListBase<T, C, VM>
        : ViewModel<T>
        where T  : BusinessListBase<T, C>
        where C  : IEditableBusinessObject
        where VM : ViewModel<C>, new()
    {
        public ViewModelListBase(ApplicationContext applicationContext)
            : base(applicationContext)
        {
        }

        List<VM> _list = null;

        public List<VM> List
        {
            get
            {
                if (_list == null)
                {
                    if (Model != null)
                    {
                        _list = new List<VM>();

                        foreach (var item in Model)
                        {
                            // This can't be done with generics:
                            // var vm = new VM(ApplicationContext);

                            // No parameterless constructor...
                            var vm = new VM();

                            // and this is not accessible currently:
                            vm.ApplicationContext = ApplicationContext;

                            vm.Model = item;

                            _list.Add(vm);
                        }
                    }
                }

                return _list;
            }
        }
    }

[rockfordlhotka]

You can probably use ApplicationContext.CreateInstanceDI instead of the new keyword.

[michaelcsikos]

Excellent, thanks.