我收到一个例外:删除记录实体框架
无法更新EntitySet的“会话”,因为它有一个DefiningQuery并没有 元素的元素存在于 支持当前的操作。
尝试从数据库表中删除一行时。对于存在的行调用SaveChanges()
时会出现异常。以下是我的代码:
public static Func<DC21GPDEntities, string, IQueryable<Session>> compiledDeleteQuery =
CompiledQuery.Compile((DC21GPDEntities ctx, string userId) =>
(from rows in ctx.Sessions
where rows.User_ID == userId
select rows));
[HttpPost]
public ActionResult Index(string searchItem)
{
try
{
string userId =searchItem.Trim();
string successMessage
= "The session for User ID: " + userId + " has been cleared in Fascor.";
dc21gpdContext.CommandTimeout = 180;
Models.Session session = Queries.compiledDeleteQuery(dc21gpdContext, userId).FirstOrDefault();
if (session == null)
successMessage = "Session for User ID: " + userId + " does noe exist";
else
{
dc21gpdContext.DeleteObject(session);
dc21gpdContext.SaveChanges();
}
ViewData["SuccessMessage"] = successMessage;
return View();
}
catch (Exception ex)
{
ViewData["SuccessMessage"] = "Failed to clear session";
return View();
}
}
会话表是否有主键? – 2012-01-17 21:08:24
@Klaus Byskov Hoffmann:不幸的是,它没有主键 – 14578446 2012-01-17 21:43:55