Is it possible to include a list in a DbSet?

Question

WCF Service Demo Code

public List<Message> GetMessages(string userAddress)
{
    return this.projectContext.Messages.Include("Contacts").ToList();
}

Message Class

public class Message
{
    public int Id { get; set; }
    public string Text { get; set; }
    public List<Contact> Contacts { get; set; }
}

When i try to consume that method on client side i get the next error:

Answer 1

如果您将联系人设为实体，则可以在上下文中包含联系人实体，并通过外键将其映射到消息实体。