用EF核心替代hasRequired是什么?

问题描述

使用Entity Framework，我们在字段上具有 HasRequired .用EF核心替代替代品是什么?

With Entity Framework we had HasRequired on a field. What is the alternative replacement for that with EF core?

https://msdn.microsoft.com/en-us/library/jj591620(v = vs.113).aspx

我尝试了 HasRequired ，但是会引发错误.

I tried with HasRequired but it throws error.

推荐答案

查看"> EF核心文档中的必需和可选关系.

具体来说，我认为您会想要这样的东西:

Specifically I think you'll want something like:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<MyEntity>()
        .HasOne(p => p.Relationship)
        .IsRequired();
}

或者类似的东西-您没有提供太多信息来继续

Or something like that - you haven't given much information to go on

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