Entity Framework 4 and Code First CTP 5 - Missing Key

Question

Can anyone understand this error?

During model generation, one or more validation errors were detected:

System.Data.Edm.EdmEntityType :: EntityType 'Address' does not have a key. Define a key for this EntityType . System.Data.Edm.EdmEntitySet: EntityType: EntitySet addresses are based on the Address type, which does not have specific keys.

I defined this entity:

public class Address
{
    [Key]
    public int ID;

    [Required]
    [MinLength(1)]
    [MaxLength(200)]
    public string Address1 { get; set; }

    [MinLength(1)]
    [MaxLength(200)]
    public string Address2 { get; set; }

    [Required]
    [MinLength(1)]
    [MaxLength(10)]
    public string Zip { get; set; }

    [MinLength(1)]
    [MaxLength(100)]
    public string Province { get; set; }

    public virtual US_State State { get; set; }

    [Required]
    public virtual Country Country { get; set; }
}

My question is: how does the error make sense for a class that has an annotation of key attribute data, as well as a conditional name for its PC.

I would think that this class satisfies all the rules necessary to create a meaningful entity.

Answer 1

, ID .

public int ID { get; set; }

, [Key] ID, (.. ) .