MajorIndexListingViewModel.cs

public class MajorIndexListingViewModel : ViewModelBase
    {
        private readonly IMajorIndexService _majorIndexService;

        private MajorIndex _BTC;
        public MajorIndex BTC
        {
            get
            {
                return _BTC;
            }
            set
            {
                _BTC = value;
                OnPropertyChanged(nameof(BTC));
            }
        }

        private MajorIndex _LTC;
        public MajorIndex LTC
        {
            get
            {
                return _LTC;
            }
            set
            {
                _LTC = value;
                OnPropertyChanged(nameof(LTC));
            }
        }

        private MajorIndex _ETH;
        public MajorIndex ETH
        {
            get
            {
                return _ETH;
            }
            set
            {
                _ETH = value;
                OnPropertyChanged(nameof(ETH));
            }
        }

        public MajorIndexListingViewModel(IMajorIndexService majorIndexService)
        {
            _majorIndexService = majorIndexService;
        }

        public static MajorIndexListingViewModel LoadMajorIndexViewModel(IMajorIndexService majorIndexService)
        {
            MajorIndexListingViewModel majorIndexViewModel = new MajorIndexListingViewModel(majorIndexService);
            majorIndexViewModel.LoadMajorIndexes();
            return majorIndexViewModel;
        }

        private void LoadMajorIndexes()
        {
            _majorIndexService.GetMajorIndex(CoinbasePro.Shared.Types.ProductType.BtcUsd).ContinueWith(task =>
            {
                if (task.Exception == null)
                {
                    BTC = task.Result;
                }
            });

            _majorIndexService.GetMajorIndex(CoinbasePro.Shared.Types.ProductType.LtcUsd).ContinueWith(task =>
            {
                if (task.Exception == null)
                {
                    LTC = task.Result;
                }
            });

            _majorIndexService.GetMajorIndex(CoinbasePro.Shared.Types.ProductType.EthUsd).ContinueWith(task =>
            {
                if (task.Exception == null)
                {
                    ETH = task.Result;
                }
            });
        }
    }