Revert "new C# features"

This reverts commit 64483f5.

Conflicts:
	ViewModels/CardViewModel.cs

Author: codeConcussion

Entities/Card.cs

@@ -9,7 +9,10 @@ public sealed class Card
         public int SecondNumber { get; set; }
         public Operation Operation { get; set; }
 
-        public int Answer => _answerStrategy[Operation](FirstNumber, SecondNumber);
+        public int Answer
+        {
+            get { return _answerStrategy[Operation](FirstNumber, SecondNumber); }
+        }
 
         private readonly Dictionary<Operation, Func<int, int, int>> _answerStrategy = new Dictionary<Operation, Func<int, int, int>>
         {

Entities/Deck.cs

@@ -14,9 +14,9 @@ public sealed class Deck
         public Card CurrentCard { get; set; }
         public List<Card> Cards { get; set; }
 
-        public int CurrentIndex => Cards.IndexOf(CurrentCard);
-        public bool HasCurrentCard => CurrentCard != null;
-        public bool IsLastCard => CurrentCard == Cards.Last();
+        public int CurrentIndex { get { return Cards.IndexOf(CurrentCard); } }
+        public bool HasCurrentCard { get { return CurrentCard != null; } }
+        public bool IsLastCard { get { return CurrentCard == Cards.Last(); } }
 
         public Card Deal()
         {

Entities/Record.cs

@@ -22,6 +22,9 @@ public Record(Deck deck, decimal seconds)
         public int Order { get; set; }
         public decimal Seconds { get; set; }
 
-        public string DisplayTime => Seconds.GetTiming();
+        public string DisplayTime
+        {
+            get { return Seconds.GetTiming(); }
+        }
     }
 }

Entities/User.cs

@@ -15,8 +15,8 @@ public User(string name)
         private List<Record> _records;
         public List<Record> Records
         {
-            get => _records ?? (_records = new List<Record>());
-            set => _records = value;
+            get { return _records ?? (_records = new List<Record>()); }
+            set { _records = value; }
         }
 
         public bool UpdateRecord(Record record)

Utilities/Container/AutoSubscriptionModule.cs

@@ -13,7 +13,8 @@ protected override void AttachToComponentRegistration(IComponentRegistry registr
 
         private static void OnComponentActivated(object sender, ActivatedEventArgs<object> e)
         {
-            var handler = e?.Instance as IHandle;
+            if (e == null) return;
+            var handler = e.Instance as IHandle;
             if (handler != null) e.Context.Resolve<IEventAggregator>().Subscribe(handler);
         }
     }

Utilities/Container/ContainerBootstrapper.cs

@@ -86,7 +86,7 @@ protected override object GetInstance(Type service, string key)
                 if (_container.TryResolveNamed(key, service, out instance)) return instance;
             }
 
-            throw new Exception($"Could not locate any instances of {key ?? service.Name}.");
+            throw new Exception(string.Format("Could not locate any instances of {0}.", key ?? service.Name));
         }
 
         protected override void OnStartup(object sender, StartupEventArgs e)

Utilities/Extensions.cs

@@ -10,7 +10,7 @@ public static class Extensions
         [DebuggerStepThrough]
         public static void ForEach<T>(this IEnumerable<T> enumerable, Action<T> action)
         {
-            foreach (var x in enumerable) action(x);
+            foreach (T x in enumerable) action(x);
         }
 
         [DebuggerStepThrough]
@@ -27,7 +27,7 @@ public static string GetTiming(this decimal value)
             if (value <= 0) return "";
             var minutes = (int)value / 60;
             var seconds = value - (minutes * 60);
-            return $"{minutes:D2}:{seconds:00.0}";
+            return string.Format("{0:D2}:{1:00.0}", minutes, seconds);
         }
     }
 }

Utilities/Game/DeckConfiguration.cs

@@ -9,7 +9,10 @@ namespace CodeConcussion.KVL.Utilities.Game
     internal static class DeckConfiguration
     {
         private static List<Deck> _decks;
-        public static List<Deck> Decks => _decks ?? (_decks = CreateDecks());
+        public static List<Deck> Decks
+        {
+            get { return _decks ?? (_decks = CreateDecks()); }
+        }
 
         private static List<Deck> CreateDecks()
         {

Utilities/Game/GameManager.cs

@@ -16,8 +16,8 @@ public GameManager(MessageDispatch dispatcher)
 
         private readonly MessageDispatch _dispatcher;
 
-        public List<Deck> AllDecks => DeckConfiguration.Decks;
         public User User { get; set; }
+        public List<Deck> AllDecks { get { return DeckConfiguration.Decks; } }
         public Color BackgroundColor { get; set; }
         public bool PlayErrorSound { get; set; }
 

Utilities/Game/UserMessageConfiguration.cs

@@ -8,7 +8,10 @@ namespace CodeConcussion.KVL.Utilities.Game
     internal static class UserMessageConfiguration
     {
         private static Dictionary<UserMessage, string> _messages;
-        public static Dictionary<UserMessage, string> Messages => _messages ?? (_messages = GetMessages());
+        public static Dictionary<UserMessage, string> Messages
+        {
+            get { return _messages ?? (_messages = GetMessages()); }
+        }
 
         private static Dictionary<UserMessage, string> GetMessages()
         {