// удаление записи из таблицы истории
public void RemoveEatingHistoryItem(EatingHistoryItem item)
{
using (_context = new Context())
{
var request = from eh in _context.EatingHistory
where eh.ID == item.ID
select eh;
_context.EatingHistory.Remove(request.Single());
_context.SaveChanges();
}
}
// добавление записи в таблицу истории
public void AddEatingHistoryItem(Dish dish, float quantity)
{
EatingHistoryItem eatingHistoryItem = new EatingHistoryItem
{
Date = DateTime.Now.Date,
Dish = dish,
Quantity = quantity,
Calories = dish.Calories / 100 * quantity,
Fats = dish.Fats / 100 * quantity,
Proteins = dish.Proteins / 100 * quantity,
Carbohydrates = dish.Carbohydrates / 100 * quantity
};
using (_context = new Context())
{
_context.Dishes.Attach(dish);
_context.EatingHistory.Add(eatingHistoryItem);
_context.SaveChanges();
}
}
