ComputersShop/ComputersShopFileImplement/Implements/ShopStorage.cs

@@ -74,41 +74,48 @@ namespace ComputersShopFileImplement.Implements
 
         public bool SellComputers(IComputerModel model, int quantity)
         {
-            int availableQuantity = source.Shops.Select(x => x.Computers.FirstOrDefault(y => y.Key == model.Id).Value.Item2).Sum();
-            if (availableQuantity < quantity)
-            {
-                return false;
-            }
-            var shops = source.Shops.Where(x => x.Computers.ContainsKey(model.Id));
-            foreach (var shop in shops)
-            {
-                int countInCurrentShop = shop.Computers[model.Id].Item2;
-                if (countInCurrentShop <= quantity)
-                {
-                    shop.Computers[model.Id] = (shop.Computers[model.Id].Item1, 0);
-                    quantity -= countInCurrentShop;
-                }
-                else
-                {
-                    shop.Computers[model.Id] = (shop.Computers[model.Id].Item1, countInCurrentShop - quantity);
-                    quantity = 0;
-                }
-                Update(new ShopBindingModel
-                {
-                    Id = shop.Id,
-                    ShopName = shop.ShopName,
-                    ShopAddress = shop.ShopAddress,
-                    DateOpening = shop.DateOpening,
-                    Computers = shop.Computers,
-                    Capacity = shop.Capacity
-                });
-                if (quantity == 0)
-                {
-                    return true;
-                }
-            }
-            return false;
-        }
+			int hasCount = 0;
+
+			source.Shops.ForEach(x =>
+			{
+				if (x.Computers.TryGetValue(model.Id, out var pair))
+				{
+					hasCount += pair.Item2;
+				}
+			});
+
+			if (hasCount < quantity) return false;
+
+			source.Shops.ForEach(x =>
+			{
+				if (x.Computers.TryGetValue(model.Id, out var pair))
+				{
+					if (quantity >= pair.Item2)
+					{
+						quantity -= pair.Item2;
+						x.Computers[model.Id] = (model, 0);
+					}
+					else
+					{
+						x.Computers[model.Id] = (model, pair.Item2 - quantity);
+						quantity = 0;
+					}
+
+					x.Update(new ShopBindingModel
+					{
+						Id = x.Id,
+						ShopAddress = x.ShopAddress,
+						Capacity = x.Capacity,
+						DateOpening = x.DateOpening,
+						ShopName = x.ShopName,
+						Computers = x.Computers
+					});
+				}
+			});
+
+			source.SaveShops();
+			return true;
+		}
 
         public ShopViewModel? Update(ShopBindingModel model)
         {

ComputersShop/ComputersShopView/FormSellComputers.cs

@@ -39,7 +39,7 @@ namespace ComputersShopView
         {
             if (comboBoxDocuments.SelectedValue == null)
             {
-                MessageBox.Show("Выберите корабль", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                MessageBox.Show("Выберите компьютер", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                 return;
             }
             if (string.IsNullOrEmpty(numericUpDownCount.Text))