Entity Framework Core add unique constraint code-first

Question

I can\'t find way to add a unique constraint to my field with using attribute:

public class User
{
    [Required]
    public int Id { get; set; }

    [Requi         


        

Answer 1

To use it in EF core via model configuration

public class ApplicationCompanyConfiguration : IEntityTypeConfiguration
{
    public void Configure(EntityTypeBuilder builder)
    {
        builder.ToTable("Company"); 
        builder.HasIndex(p => p.Name).IsUnique();
    }
}