Entity Framework 7 Code First中的一对一关系 [英] One-to-One relationships in Entity Framework 7 Code First

问题描述

如何首先使用数据注释或Fluent Api在Entity Framework 7代码中配置一对一或零或一对一关系？

How to configure One-to-One or ZeroOrOne-to-One relationships in Entity Framework 7 Code First using Data Annotations or Fluent Api?

推荐答案

您可以在Entity Framework 7中使用Fluent API定义OneToOne关系，如下所示：

You can define OneToOne relationship using Fluent API in Entity Framework 7 as below

class MyContext : DbContext
{
    public DbSet<Blog> Blogs { get; set; }
    public DbSet<BlogImage> BlogImages { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Blog>()
            .HasOne(p => p.BlogImage)
            .WithOne(i => i.Blog)
            .HasForeignKey<BlogImage>(b => b.BlogForeignKey);
    }
}

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

    public BlogImage BlogImage { get; set; }
}

public class BlogImage
{
    public int BlogImageId { get; set; }
    public byte[] Image { get; set; }
    public string Caption { get; set; }

    public int BlogForeignKey { get; set; }
    public Blog Blog { get; set; }
}

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