public void UpdateRecipe(Recipe item)
{
// update record in db
bool ok = DBHelper.Update(item);
if (!ok)
{
throw new InvalidOperationException();
}
// remove item from old group if category is changed
bool isRemoved = false;
foreach (var group in GroupedRecipes)
{
if (group.Contains(item) && (string)group.Key != item.Category)
{
group.Remove(item);
isRemoved = true;
}
}
// add item to new group if needed
if (isRemoved)
{
GroupedRecipes.GetOrAddGroup(item.Category).Add(item);
// recount items in categories
RecipeCategories.CountItemsFrom(GroupedRecipes);
}
}
public void DeleteRecipe(Recipe item)
{
// delete record from db
bool ok = DBHelper.Delete(item);
if (!ok)
{
throw new InvalidOperationException();
}
// remove item from collection
Recipes.Remove(item);
// remove item from grouped collection
GroupedRecipes.GetOrAddGroup(item.Category).Remove(item);
// recount items in categories
RecipeCategories.CountItemsFrom(GroupedRecipes);
}
public void AddRecipe(Recipe item)
{
// add new record to database
bool ok = DBHelper.Insert(item);
if (!ok)
{
throw new InvalidOperationException();
}
// add item to collection
Recipes.Add(item);
// add item to grouped collection
GroupedRecipes.GetOrAddGroup(item.Category).Add(item);
// recount items in categories
RecipeCategories.CountItemsFrom(GroupedRecipes);
}