Unable to create a constant value of type 'System.Object'. Only primitive types ('such as Int32, String, and Guid') are supported in this context

Question

I\'m using MVC and Entity Framework. I\'ve created a class in my model folder with this code below. I keep getting the error message above with both queries below. I know

Answer 1

same issue using Any() i had to change my where clause to search on primitive types, for me int

so this

where order.User == user

becomes this

where order.User.UserId == user.UserId

There is a blog post explaining the quirk.