Entity Framework Code First Using One column as Primary Key and another as Auto Increment Column

Question

I have a class named Sale

public class Sale
{
    public int Id { get; set; }
    public string TrNo { get; set; }
    public DateTime Date          


        

Answer 1

I believe you can do this using Fluent API

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity().Property(a => a.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
    modelBuilder.Entity().Property(a => a.TrNo).HasKey(b => b.TrNo);
}