public BookCategory Update(BookCategory t)
{
BookCategory f = Get(t.Id);
if (f == null)
{
throw new ArgumentNullException($"BookCategory Item with id {t.Id} does not exist or its deleted");
}
bookCategory.Remove(t);
if (!IsDuplicate(t))
{
if (t.Id <= 0)
{
throw new ArgumentException("Invalid BookCategory Item Id");
}
f.CategoryName = t.CategoryName;
f.Quantity = t.Quantity;
f = DbStore.Save <BookCategory>(f);
return(f);
}
else
{
bookCategory.Add(f);
throw new DuplicateItemException("BookCategory Item already exists");
}
}
public void Delete(long id)
{
BookCategory r = Get(id);
DbStore.Delete <BookCategory>(r);
bookCategory.Remove(r);
}
public BookCategory Add(BookCategory t)
{
if (!IsDuplicate(t))
{
t.Id = 0;
var ret = DbStore.Save <BookCategory>(t);
if (ret != null)
{
bookCategory.Add(ret);
}
return(ret);
}
else
{
throw new DuplicateItemException("Book Category already exists");
}
}
bool IsDuplicate(BookCategory r)
{
return(bookCategory.Exists(d => (d.CategoryName == r.CategoryName && d.Quantity == r.Quantity)));
}