c# - .HasRequired 无法在模型中工作

Question

我一直在四处寻找答案，但找不到合适的答案。我有两个具有 1:* 关系的模型:

namespace test.Models
{
    public class Blog 
    { 
        public int Id { get; set; } 
        public string Title { get; set; } 
        public string BloggerName { get; set; } 
        public virtual ICollection<Post> Posts { get; set; } 
    } 
}

namespace test.Models
{
    public class Post
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public DateTime DateCreated { get; set; }
        public string Content { get; set; }
        public int BlogId { get; set; }
        public Blog Blog { get; set; }
    }
}

还有我的ApplicationDbContext是:

namespace test.Models
{
     public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public DbSet<Post> Post { get; set; }
        public DbSet<Blog> Blog { get; set; }
        protected override void OnModelCreating(ModelBuilder builder)
        {
             base.OnModelCreating(builder);
             base.OnModelCreating(builder);
             builder.Entity<Post>().HasRequired(p => p.Blog);
         }
     }
 }

但是，我得到以下错误:

CS1061: 'EntityTypeBuilder' does not contain a definition for 'HasRequiered' and no extension method 'HasRequiered' accepting a first argument of type 'EntityTypeBuilder' could be found (are you missing a using directive or an assembly reference?)

我是新手，所以一直在学习各种教程，但都推荐以这种方式使用它。任何帮助将不胜感激。我只想确保 <post>始终是博客的一部分。 HasRequiered尽管此错误始终显示为红色。

Answer 1

试试这个:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
     base.OnModelCreating(modelBuilder);
     modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
     builder.Entity<Post>().HasRequired(p => p.Blog);
}