多個父實體首先在EF代碼中包含一個子實體

Question

有兩個實體Post和Photo 。 兩者都有comment實體的集合。

反正是為了避免下面寫的mapping （必須為Comment實體中的每個父項定義一個屬性）？

public class Post
{
    public string Title {get; set;}
    public ICollection<Comment> Comments{get; set; }
}

public class Photo
{
    public string Path{get;set;}
    public ICollection<Comment> Comments{get; set; }
}

public class Comment
{
    public int? PostId{get;set;}
    public Virtual Post Post{get;set;}

    public int? PhotoId{get;set;}
    public Virtual Photo Photo{get;set;}
}

Answer 1

你可以這樣做，

public class PostBase{
    public ICollection<Comment> Comments{get; set; }
}


public class Post:PostBase
{
    public string Title {get; set;}

}

public class Photo:PostBase
{
    public string Path{get;set;}

}

public class Comment
{
    public int? PostBaseId{get;set;}
    public Virtual PostBase PostBase{get;set;}

}