Второй этап доделан

SelfPropelledArtilleryUnit/MapsCollection.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Artilleries
+{
+    internal class MapsCollection
+    {
+        readonly Dictionary<string, MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>> _mapsStorage;
+        public List<string> Keys => _mapsStorage.Keys.ToList();
+
+        private readonly int _pictureWidth;
+        private readonly int _pictureHeight;
+
+        public MapsCollection(int pictureWidth, int pictureHeight)
+        {
+            _mapsStorage = new Dictionary<string, MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>>();
+            _pictureWidth = pictureWidth;
+            _pictureHeight = pictureHeight;
+        }
+
+        public void AddMap(string name, AbstractMap map)
+        {
+            if (!_mapsStorage.ContainsKey(name))
+            {
+                _mapsStorage.Add(name, new MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>(_pictureWidth, _pictureHeight, map));
+            }
+        }
+
+        public void DelMap(string name)
+        {
+            if (_mapsStorage.ContainsKey(name))
+            {
+                _mapsStorage.Remove(name);
+            }
+        }
+
+        public MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap> this[string index]
+        {
+            get
+            {
+                return _mapsStorage.ContainsKey(index) ? _mapsStorage[index] : null;
+            }
+        }
+    }
+}