//在数据库里存在的内容上进行修改
public void Update(Order order)
{
using (var db = new OrderDB())
{
db.Order.Attach(order);
db.Entry(order).State = EntityState.Modified;
order.OrderDetails.ForEach(
detail => db.Entry(detail).State = EntityState.Modified);
db.SaveChanges();
}
}
public void Add(Order order)
{
using (var db = new OrderDB())
{
db.Order.Add(order);
//db.Order.Attach(order);
db.Entry(order).State = EntityState.Added;
db.SaveChanges();
}
}
public void UpdateOr(Order order)
{
using (var db = new OrderDB())
{
db.OrderDetail.RemoveRange(order.OrderDetails);
db.Order.Remove(order);
db.Order.Add(order);
db.Entry(order).State = EntityState.Added;
db.SaveChanges();
}
}