protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<PostBody>().Property(p => p.ID)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
}
也可以通过在实体类属性上加标记实现：
public class BlogPost
{
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public int ID { get; set; }
}