我收到一個例外:刪除記錄實體框架
無法更新EntitySet的「會話」,因爲它有一個DefiningQuery並沒有 元素的元素存在於 支持當前的操作。
嘗試從數據庫表中刪除一行時。對於存在的行調用SaveChanges()
時會出現異常。以下是我的代碼:
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();
}
}
會話表是否有主鍵? – 2012-01-17 21:08:24
@Klaus Byskov Hoffmann:不幸的是,它沒有主鍵 – 14578446 2012-01-17 21:43:55