Added some animations, fixed crash when reopening folder

Photos/Models/Photo.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.IO;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -96,7 +97,7 @@ public static partial class PhotoExtension
                     .ToList();
     }
 
-    public static void CreateAndAddPhotosToList(List<string> photos, string rootPath, IList<Photo> toAddTo)
+    public static void CreateAndAddPhotosToList(List<string> photos, string rootPath, ObservableCollection<Photo> toAddTo)
     {
         var bag = new ConcurrentBag<Photo>();
 
@@ -105,12 +106,12 @@ public static partial class PhotoExtension
             bag.Add(new Photo(p, rootPath));
         });
 
-        Dispatcher.UIThread.InvokeAsync(() =>
+        Dispatcher.UIThread.Invoke(() =>
         {
             foreach (var photo in bag)
             {
                 toAddTo.Add(photo);
             }
-        }).GetAwaiter().GetResult(); // TODO: When reopening folder this throws exception
+        }); // TODO: When reopening folder this throws exception
     }
 }