using System.ComponentModel.DataAnnotations.Schema; using System.Data.Entity.Infrastructure.Annotations; using System.Data.Entity.ModelConfiguration.Configuration; namespace Plattform.Helper { public static class MappingExtensions { public static PrimitivePropertyConfiguration IsUnique(this PrimitivePropertyConfiguration configuration) { return configuration.HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute { IsUnique = true })); } } }