EFCore中如何移除主外键关系
场景介绍
我用EFCore写了一个blog程序,我要通过写文章来分享自己的知识,我定义了一个Article
用来存放文章信息,我还定义了一个Category
用来存放文章的分类,Category
与Article
是一对的关系。我的代码实现如下:
Article
public class Article
{
public int Id {get;set;}
public int CategoryId {get;set;}
//导航属性,efcore会自动创建主外键关系
public Category Category {get;set;}
}
Category
public class Category
{
public int Id {get;set;}
//导航属性,efcore会自动创建主外键关系
public List<Article> Articles { get; set; }
}
MyBlogDbContext
public class MyBlogDbContext:DbContext
{
public MyBlogDbContext(DbContextOptions options):base(options)
{}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
//Article
var articleBuilder = modelBuilder.Entity<Article>();
articleBuilder.ToTable("Article");
articleBuilder.HasKey(article => article.Id);
articleBuilder.HasIndex(article => article.CategoryId);
//Category
var categoryBuilder=modelBuilder.Entity<Category>();
categoryBuilder.ToTable("Category");
categoryBuilder.HasKey(category => category.Id);
}
}