Этап 2. Класс MapsCollection.

Liner/Liner/MapsCollection.cs

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