Create property dynamically in viewmodel MVVM light and UWP

Question

I would like to create viewmodel properties in runtime.

I'm not so familiar with MVVM in UWP. Rather windows forms. In the past I created custom class object with reflection and I had possibility to add properties in runtime. In current project I prepared solution with mvvm ligt and UWP app. Works fine with data exchange on viewmodel level. Now I try to find how to create properties of viewmodel in runtime ie. from descriptions in xml file.

namespace hmi_panel.ViewModels
{
    public class HomeViewModel : ViewModelBase
    {
        #region Fields
        readonly IPlcService _plcService;
        #endregion

        #region Constructors

        public HomeViewModel(IPlcService dummyPlcService)
        {
            _plcService = dummyPlcService;
            _plcService.Connect("127.0.0.1", 0, 1);

            //zdarzenie cyklicznego odswiezania zeminnych
            OnPlcServiceValuesRefreshed(null, null);
            _plcService.ValuesRefreshed += OnPlcServiceValuesRefreshed;
        }

        #endregion

        #region Properties

        public string AppVersion
        {
            get { return $"{Package.Current.Id.Version.Major}. 
{Package.Current.Id.Version.Minor}.{Package.Current.Id.Version.Build}. 
{Package.Current.Id.Version.Revision}"; }
        }

        public string AppCopyright
        {
            get { return "plc service: " + _plcService.ConnectionState.ToString(); }
        }

        private bool _pumpState;
        public bool pumpState
        {
            get { return _pumpState; }
            set {

                 _pumpState=value;
                RaisePropertyChanged(() => pumpState);

            }
        }

        #endregion

        #region Methods
        private RelayCommand _ConnectCommand;
        public RelayCommand ConnectCommand
        {
            get
            {
                return _ConnectCommand ?? (_ConnectCommand = new RelayCommand(() =>
                {
                    pumpState = true;

                }, () => true));
            }
        }

        private void OnPlcServiceValuesRefreshed(object sender, EventArgs e)
        {

            pumpState = _plcService.PumpState;

        }

        #endregion
    }
}

Property pumpState value is readed and writed with _plService. I can change value and I can read after external change. I would like to start only with bidirectional binding in xaml and create needed property ie. pumpState when viewmodel instance is created ie. in construtor.

I've helped you format your code. Please read [How do I format my posts using Markdown or HTML?](https://stackoverflow.com/help/formatting) to format your post next time. — Xie Steven, Jan 03 '19 at 02:32
I actually did not quite understand what you want to do. Did you want to use **TwoWay** bindings to change your property's value on XAML? — Xie Steven, Jan 03 '19 at 02:33
Yes I did. Property value in viewmodel is changed in proper way. I just want to create properties in viewmodel not in code but in runtime ie. from some description list. — Jakub Okaj, Jan 03 '19 at 20:31
You could bind it on XAML and set `Mode=TwoWay`. For example, you could bind the `CheckBox`'s IsChecked to `pumpState` property. `` Then, when the CheckBox checked or unchecked, the `pumpState` property's value will be changed. — Xie Steven, Jan 04 '19 at 01:51
That's done. It works. My goal is to do not define property pumpState in static code but build viewmodel object properties in runtime. — Jakub Okaj, Jan 04 '19 at 09:25

Create property dynamically in viewmodel MVVM light and UWP

0 Answers0