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为什么在Entity Framework模型定义中使用'virtual'作为类属性?

在以下博客中:http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx

该博客包含以下代码示例:

public class Dinner
{
   public int DinnerID { get; set; }
   public string Title { get; set; }
   public DateTime EventDate { get; set; }
   public string Address { get; set; }
   public string HostedBy { get; set; }
   public virtual ICollection<RSVP> RSVPs { get; set; }
}

public class RSVP
{
   public int RsvpID { get; set; }
   public int DinnerID { get; set; }
   public string AttendeeEmail { get; set; }
   public virtual …
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c# virtual properties class

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