[entity framework core] Entity Framework Core Type Configuration

https://www.learnentityframeworkcore.com/configuration/fluent-api/type-configuration

how to use?

protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity(typeof(EntityName))...
    }

protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity("EntityName")...
    }

protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
       modelBuilder.Entity<EntityName>()...
    }

example

public class SampleContext : DbContext
    {
        public DbSet<Order> Orders { get; set; }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Order>()
                .HasKey(o => o.OrderNumber);
        }
    }
    public class Order
    {
        public int OrderNumber { get; set; }
        public DateTime DateCreated { get; set; }
        public Customer Customer { get; set; }
        ...
    )

public class SampleContext : DbContext
{
    public DbSet<Order> Orders { get; set; }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Order>()
            .HasKey(o => new { o.CustomerAbbreviation, o.OrderNumber });
    }
}