oemanxTrader/OemanTrader.WPF/ViewModels/MajorIndexListingViewModel.cs

using OemanTrader.Domain.Models;
using OemanTrader.Domain.Services;
using OemanTrader.FinantialModelingPrepAPI.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OemanTrader.WPF.ViewModels
{
    public class MajorIndexListingViewModel : ViewModelBase
    {
        private readonly IMajorIndexService _majorIndexService;


        private MajorIndex _dowJones;
        public MajorIndex DowJones {
            get { return _dowJones; }
            set {
                _dowJones = value;
                OnPropertyChanged(nameof(DowJones));    
            }
        }

        private MajorIndex _nasdaq;
        public MajorIndex Nasdaq
        {
            get { return _nasdaq; }
            set
            {
                _nasdaq = value;
                OnPropertyChanged(nameof(Nasdaq));
            }
        }

        private MajorIndex _sp500;
        public MajorIndex SP500
        {
            get { return _sp500; }
            set
            {
                _sp500 = value;
                OnPropertyChanged(nameof(SP500));
            }
        }

        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(MajorIndexType.DowJones).ContinueWith(task => 
            {
                if(task.Exception == null) {
                    DowJones = task.Result;
                }
            });
            _majorIndexService.GetMajorIndex(MajorIndexType.Nasdaq).ContinueWith(task =>
            {
                if (task.Exception == null)
                {
                    Nasdaq = task.Result;
                }
            }); 
            _majorIndexService.GetMajorIndex(MajorIndexType.SP500).ContinueWith(task =>
            {
                if (task.Exception == null)
                {
                    SP500 = task.Result;
                }
            });
        }
    }
}