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问题描述
因此，如果我直接使用此查询或使用 db.ExecuteCommand() ，一切都会正常工作；
update Market..Area set EndDate = NULL where ID = 666 and NID =1 and Code = 36003
但是，我似乎无法在 LINQ to SQL 中执行此操作，我尝试了几种不同的方法，它们似乎都应该工作，这里是一个示例:
var s= db.Area.Single(s => s.ID == 666 && s.Code == 36003 && s.NID == 1); s.EndDate = null; db.SubmitChanges();
我不知道还有什么办法可以让它发挥作用.
我只是想编辑一个项目
推荐答案
Area表上是否定义了主键?Linq 2 SQL 不会对未定义主键的表进行更新.(而且，据我所知，它会默默地失败).
问题描述
So, if I use this query directly or by using db.ExecuteCommand() , everything will work fine;
update Market..Area set EndDate = NULL where ID = 666 and NID =1 and Code = 36003
However, I cant seem to do this in LINQ to SQL, I've tried a few different methods that all seem like they should work, here is an example of one:
var s= db.Area.Single(s => s.ID == 666 && s.Code == 36003 && s.NID == 1); s.EndDate = null; db.SubmitChanges();
I dont know what else to try to get this working.
EDIT
I am only trying to edit ONE item
推荐答案
Is there a primary key defined on the Area table? Linq 2 SQL will not make an update to a table without a primary key defined. (And, as far as I can remember, it will fail silently).
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