initial load

YouTubeViewers.WPF/ViewModels/YouTubeViewersDetailsViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using YouTubeViewers.WPF.Stores;
+using YouTubeViewers.Domain.Models;
+
+namespace YouTubeViewers.WPF.ViewModels
+{
+    public class YouTubeViewersDetailsViewModel : ViewModelBase
+    {
+        private readonly SelectedYouTubeViewerStore _selectedYouTubeViewerStore;
+        private YouTubeViewer SelectedYouTubeViewer => _selectedYouTubeViewerStore.SelectedYouTubeViewer;
+
+        public bool HasSelectedYouTubeViewer => SelectedYouTubeViewer != null;
+        public string UserName => SelectedYouTubeViewer?.Username ?? "Unknown";
+        public string IsSubScribedDisplay => (SelectedYouTubeViewer?.IsSubscribed ?? false) ? "Yes" : "No";
+        public string IsMemberDisplay => (SelectedYouTubeViewer?.IsMember ?? false) ? "Yes" : "No";
+
+        public YouTubeViewersDetailsViewModel(SelectedYouTubeViewerStore selectedYouTubeViewerStore)
+        {
+            _selectedYouTubeViewerStore = selectedYouTubeViewerStore;
+
+            _selectedYouTubeViewerStore.SelectedYouTubeViewerChanged += SelectedYouTubeViewerStore_SelectedYouTubeViewerChanged;
+        }
+
+        protected override void Dispose()
+        {
+            _selectedYouTubeViewerStore.SelectedYouTubeViewerChanged -= SelectedYouTubeViewerStore_SelectedYouTubeViewerChanged;
+            base.Dispose();
+        }
+
+        private void SelectedYouTubeViewerStore_SelectedYouTubeViewerChanged()
+        {
+            OnPropertyChanged(nameof(HasSelectedYouTubeViewer));
+            OnPropertyChanged(nameof(UserName));
+            OnPropertyChanged(nameof(IsSubScribedDisplay));
+            OnPropertyChanged(nameof(IsMemberDisplay));
+        }
+    }
+}