Unable to create a constant value of type 'System.Object' in Entity Framework

Question

I have a table named UserTenders having many-to-one relationship with aspnet_Membership table.
I am using EntityFramework 4.0 and when I try so

Answer 1

Just wanted to point out, you could have also used tender.HasAdminApproved.HasValue.Equals(true))... this works when bool allows nulls

Answer 2

I had the same exception caused by a different problem: a char versus a string used as a constant. My select looked like this:

from p in Person
select new Foo
{
  FullName = p.FirstName + ' ' + p.LastName
}

The boolean conditionals I had elsewhere in the query (i.e. "where p.IsActive") worked fine. I had to switch to using a string:

from p in Person
select new Foo
{
  FullName = p.FirstName + " " + p.LastName
}

This obviously is not the answer to the OP's question, but I was unable to find a similar question with the char/string issue so I wanted to post it for others' benefit.

Answer 3

Try replacing

.Where(tender => tender.HasAdminApproved.Equals(true))

With:

.Where(tender => tender.HasAdminApproved == true)

Or as previously suggested by @Ladislav Mrnka if your field is bool?

.Where(tender => tender.HasAdminApproved)

Answer 4

@Ladislav told you the correct answer (.Where(tender => tender.HasAdminApproved)), but you might wonder why you get this message.

You're trying to call System.Boolean.Equals(Object obj). So you're boxing the constant true. And L2E, as the message says, has no support for a const of a non-primitive type like System.Object. Hence the error.