DataContractSerializer Error using Entity Framework 4.0 with WCF 4.0

When using the DbContext API for Code First (EF 4.3) I had to do:

public class MyClass : DbContext
{
    public MyClass()
    {
        base.Configuration.ProxyCreationEnabled = false;
    }
}

For EntityFramework 6.0 I had to change configuration as well:

public class MyContext : DbContext
{
    public MyContext() : base("name=MyContext")
    {
        Configuration.ProxyCreationEnabled = false;
    }
}

This was a pain to figure out but it is because EntityFramework creates a 'proxy' of your class. The TestObject class I had was setup correctly, but it was creating a class called: TestObject_240F2B681A782799F3A0C3AFBE4A67A7E86083C3CC4A3939573C5410B408ECCE

To make the ChannelFactory + WCF + Entity Framework all work together, you must go into your Context constructor and add the following:

ContextOptions.ProxyCreationEnabled = false;

I hope this helps someone else.