Question

有两个实体Post和Photo。两者都有comment实体的集合。

无论如何都要避免下面写的mapping（必须为Comment实体中的每个父级定义一个属性？ / p>

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

你可以这样做，

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;}

}

多个父实体首先在EF代码中包含一个子实体

1 个答案: