您是从头开始创建订单行吗?如果是这样，则需要确保它们是新的，并且要为要添加的每个OrderLine调用Context.OrderLines.InsertOnSubmit(orderLine)，否则会遇到类似问题.另外，您应该在此处提供所有异常详细信息...

Are you creating OrderLines from scratch? If so, you need to make sure that if they're new, that you're calling Context.OrderLines.InsertOnSubmit(orderLine) for each OrderLine you're adding, or you'll get problems like this. Also, you should provide all exception details here...