在实体框架6的更新数据库上未调用Seed方法

时间:2019-01-13 15:46:58

标签: c# sql-server database entity-framework

我有以下DbContext类。关于EF的一切都运转良好(迁移,关系等),唯一对我不起作用的是播种。我尝试了许多不同的解决方案,但似乎没有任何效果。有人知道吗?

当我运行update-database时,似乎执行了seed方法,但是数据库中没有任何更新。

public class ProgramContext : DbContext
{
    public ProgramContext() : base("ProgramContext")
    {
        Database.SetInitializer<ProgramContext>(new MyDbInit());
    }

    public DbSet<Bin> Bins { get; set; }
    public DbSet<Goal> Goals { get; set; }
    public DbSet<Queue> Queues { get; set; }
    public DbSet<Status> Statuses { get; set; }


    public class MyDbInit : DropCreateDatabaseIfModelChanges<ProgramContext>
    {
        protected override void Seed(ProgramContext context)
        {
            IList<Status> statuses = new List<Status>();
            Status status0 = new Status("WH-RAMP");
            Status status1 = new Status("Transport > Lijn");
            Status status2 = new Status("In lijn");
            Status status3 = new Status("Retour lijn");
            Status status4 = new Status("Transport > WH");
            context.Statuses.Add(status0);

            context.SaveChanges();
            base.Seed(context);
        }
    }
}

Bin.class

public class Bin
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long BinId { get; set; }
    public string Barcode { get; set; }
    public Status Status { get; set; }
    public bool Full { get; set; }

    public Bin(string Barcode, Status Status, bool full)
    {
        this.Barcode = Barcode;
        this.Status = Status;
        this.Full = Full;
    }

}

Status.class

public class Status
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long StatusId { get; set; }
    public string StatusName { get; set; }

    public Status(string StatusName)
    {
        this.StatusName = StatusName;
    }
}

1 个答案:

答案 0 :(得分:1)

From the Documentation

  

DropCreateDatabaseIfModelChanges   IDatabaseInitializer的实现将仅在自创建数据库以来模型已更改的情况下才删除,重新创建和有选择地重新种子数据库。

这可能会有所帮助。 Configuration类位于migrations文件夹内。

internal sealed class Configuration : DbMigrationsConfiguration<BookService.Models.BookServiceContext>
{
     protected override void Seed(BookService.Models.BookServiceContext context)
     {
        Status status0 = new Status("WH-RAMP");
        Status status1 = new Status("Transport> Lijn");
        Status status2 = new Status("In lijn");
        Status status3 = new Status("Retour lijn");
        Status status4 = new Status("Transport > WH");
        context.Statuses.Add(status0);
        context.Statuses.Add(status1);
        context.Statuses.Add(status2);
        context.Statuses.Add(status3);
        context.Statuses.Add(status4);

     }
}