What is the replacement for hasRequired with EF core?

问题

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

i tried with hasRequired, but it throws error.

回答1:

Check out the Required and Optional Relationships in the EF Core Documentation.

Specifically I think you'll want something like:

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

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

来源：https://stackoverflow.com/questions/50577357/what-is-the-replacement-for-hasrequired-with-ef-core