如何使從屬實體只讀而不丟失EF core 2.0中的外鍵？

Question

我正在嘗試使BlogId和Blog為只讀，而不會將BlogId作為外鍵丟失。 如何在EF Core 2.0中實現這一目標？ 謝謝

    public class Blog
    {
        public int Id { get; set; }
        public string Url { get; set; }
    }

    public class Post
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }

        private int _blogId;
        public int BlogId =>_blogId;

        //I want this entity to be read-only without loose the foreign key             
        //in the database 
        public Blog Blog { get; set; }
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)        
    {
       modelBuilder.Property<int>("BlogId").HasField("_blogId");
    }

Answer 1

使Blog屬性的set訪問器protected

public Blog Blog { get; protected set; }