使用代码添加母版和详细信息 [英] Add Master and Details with code

问题描述

我希望在论坛的其他地方都不会回答这个问题.

I hope this wasn't answered elsewhere in the forums.

假设我正在如何?"一书中与贝丝的项目一起工作.视频中，她有一个OrderHeader表和一个与一对多关系相关的OrderDetails表.我看到如何通过以下方式在代码中添加新的OrderHeader  item:

Suppose I'm working with Beth's project from the "How do I?" videos, where she has an OrderHeader table, and an OrderDetails table related with a one to many relationship. I see how one could add a new OrderHeader  item in code by:

Dim oHeader as new OrderHeader()
with oHeader
.HeaderDetail1 = something
.HeaderDetail2 = somethingelse
end with

结尾

一个人如何同时添加一个新的OrderHeader，然后向该标头添加一个新的OrderDetail?

How would one add both a new OrderHeader, and then add a new OrderDetail to that header?

此外，如何将刚刚创建的OrderHeader或OrderDetail定位到其他查询目的?

Also, how could one target the just-created OrderHeader or OrderDetail  for other querying purposes?

推荐答案

使用与OrderHeader相同的逻辑.  抱歉，这是在C#中:

Use the same logic as you did for the OrderHeader.  Sorry this is in C#:

var oHeader = new OrderHeader();
// Set order header properties here.

var headerDetail = new HeaderDetail();
headerDetail.OrderHeader = oHeader;
// Set header detail properties here
// etc.

如果您还希望将新记录包含在某些查询中，则可能要调用SaveChanges.

You'll probably want to call SaveChanges if you also want the new records to be included in some query.

LightSwitch博客上应该有此示例，但在这里您必须深入研究博客/帖子-您可能找不到专门的博客/帖子名称.

There should be examples of this on the LightSwitch blog and here but you'll have to drill into the blog/post a bit - you might not find it specifically the blog/post name.

希望这会有所帮助.

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