C# Data Annotations in Interface

Question

Quick question...

If I put a notation in the Interface...

Say [Required]

can I ommit that notation in the C# class for the property?

i.e. can

Answer 1

The Data Annotation won't work but I don't know why.

If you are using EF code first you can use Fluent API to force this behavior when creating your database. This is a workaround, not a real solution because only your database will check the constraint, not EF or any other system working with Data Annotation (well I suppose).

I did it with

public partial class MyDbContext : DbContext
{
    // ... code ...

    protected override void OnModelCreating(DbModelBuilder dbModelBuilder)
    {
        dbModelBuilder.Types().Configure(y => y.Property(e => e.Bar).IsRequired());
    }
}

Telling the system that when it recognize a class implementing IFoo you configure the property to IsRequired.