Entity Framework Code First - Mapping a table to another with both single and multiple relations?

Question

I am trying to set up a relationship where a Car can have multiple Testruns, as well as an optionally selected "active testrun".

public class Car
{
    public int ID { get; set; }

    public virtual TestRun ActiveTestRun { get; set; }
    public virtual ICollection<TestRun> TestRuns { get; set; }
}


public class TestRun
{
    public int ID { get; set; }
    public double TopSpeed { get; set; }

    public virtual Car ActiveCar { get; set; }
    public virtual Car Car { get; set; }
}

I have been trying to use InverseProperties with or without ForeignKey-attributes but to no luck. What is the correct way to setup this kind of relation? TIA!

Ps. I think I tried mostly all of the combinations from this tutorial without getting it to work :( http://www.entityframeworktutorial.net/code-first/inverseproperty-dataannotations-attribute-in-code-first.aspx

EDIT: The resulting DB-schema I would want is something like:

tbl_Cars: ID, ActiveTestRunID[Nullable]

tbl_TestRuns: ID, TopSpeed, CarID

Answer 1

This achieved the result that I wanted:

public class Car
{
    public int ID { get; set; }

    public int? ActiveTestRunID { get; set; }
    public virtual TestRun ActiveTestRun { get; set; }

    [InverseProperty("Car")]
    public virtual ICollection<TestRun> TestRuns { get; set; }
}


public class TestRun
{
    public int ID { get; set; }
    public double TopSpeed { get; set; }

    public int CarID { get; set; }
    public virtual Car Car { get; set; }
}