LinqPad + EF Code First: The type 'UserQuery+' was not mapped. Check that the type has not been explicitly excluded by using the Ignore method or NotMappedAttribute data annotation. Verify that the type was defined as a class, is not primitive, nested or generic, and does not inherit from EntityObject.

Take the following simple Entity Framework code:

public static void Main()
{
 var context = new MyContext();
 context.Database.Connection.ConnectionString = "Data Source=.;Integrated Security=SSPI;Initial Catalog=AndyTest;MultipleActiveResultSets=true";
}

public class Person
{
 [Key]
 public int Id { get; set; }
 public int Age { get; set; }
 [StringLength(50)]
 public int Name { get; set; }
}

public class MyContext : DbContext
{
 public DbSet Persons {get; set;}
}

If you run this in LinqPad, you get the error: The type 'UserQuery+Person' was not mapped. Check that the type has not been explicitly excluded by using the Ignore method or NotMappedAttribute data annotation. Verify that the type was defined as a class, is not primitive, nested or generic, and does not inherit from EntityObject. This is because all the code written in LinqPad is encapsulated within a UserQuery class - and Entity Framework will complain that the Person class is nested within LinqPad's UserQuery class. To allow this code to work within LinqPad, add the following line to the top of the LinqPad code:

#define NONEST

http://stackoverflow.com/questions/8730225/linqpad-ef-4-1-sqlce