Question

In my current query I’m having an error like this:

The datetime literal value '2012-05-24' is not valid.   

For regular linq query it seems like this:

_listHistory = (from item in dbase.histories
                where item.UserID == details.UserID && item.FriendID.HasValue == true && item.LogDate < today
                select item).OrderByDescending(x => x.LogDate).Take(take).Skip(skip).ToList();  

I will be dealing with number of table “Columns” so I have to use linq predicate:

string predicate = string.Format("it.UserID=={0} && CAST(it.{1} as Edm.Int64) != null  && it.LogDate <= DATETIME'{2}'",
            details.UserID, columnname, string.Format("{0:yyyy-MM-dd}", today));

_listHistory = dbase.histories.Where(predicate)
                .OrderByDescending(x => x.LogDate).Take(take).Skip(skip).ToList();  

But this query result the error above. Can anyone help me to construct my linq query?
It is my first time to deal with Linq predicates and literals.

Answer 1

You could likely use the dynamic LINQ support instead, but assuming this is Entity Query Language, it appears that you can construct the datetime with a call to CreateDateTime:

http://msdn.microsoft.com/en-us/library/bb738563.aspx

CreateDateTime( year, month, day, hour, minute, second)