我对MVC很新,我有级联删除的麻烦.对于我的模型我以下2个类：
public class Blog
{
[Key]
public int Id { get; set; }
[required]
public string Name { get; set; }
[DisplayFormat()]
public virtual ICollection<BlogEntry> BlogEntries { get; set; }
public DateTime CreationDateTime { get; set; }
public string UserName { get; set; }
}
public class BlogEntry
{
[Key]
public int Id { get; set; }
[required]
public string Title { get; set; }
[required]
public string Summary { get; set; }
[required]
public string Body { get; set; }
public List<Comment> Comments { get; set; }
public List<Tag> Tags { get; set; }
public DateTime CreationDateTime { get; set; }
public DateTime UpdateDateTime { get; set; }
public virtual Blog ParentBlog { get; set; }
}
对于我的控制器,我设置他在删除帖子后继续：
[HttpPost,ActionName("Delete")]
public ActionResult DeleteConfirmed(int id)
{
Blag blog = db.Blogs.Find(id);
foreach (var blogentry in blog.BlogEntries)
{
//blogentry = db.BlogEntries.Find(id);
db.BlogEntries.Remove(blogentry);
}
db.Blogs.Remove(blog);
db.SaveChanges();
return RedirectToAction("Index");
}
问题是无论如何都不会工作I read this post但是我似乎只适用于关系是一对一的模型,所以我在这里失去了,我有无处不在的搜索,找不到这个问题的解决方案,如果有人可以指出我错过了什么这真的很好:),谢谢提前,再次,赦免我的nooobness我刚刚开始,但想要解决一个大项目,以能够学到很多.
解决方法
这是因为默认情况下,EF不会为可选关系强制执行级联删除.您的模型中的关系被推断为可选的.
public class BlogEntry
{
[Key]
public int Id { get; set; }
[required]
public string Title { get; set; }
[required]
public string Summary { get; set; }
[required]
public string Body { get; set; }
public List<Comment> Comments { get; set; }
public List<Tag> Tags { get; set; }
public DateTime CreationDateTime { get; set; }
public DateTime UpdateDateTime { get; set; }
public int ParentBlogId { get; set; }
public virtual Blog ParentBlog { get; set; }
}
或使用流畅的API进行配置
modelBuilder.Entity<BlogEntry>()
.Hasrequired(b => b.ParentBlog)
.WithMany(b => b.BlogEntries)
.WillCascadeOnDelete(true);
