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[英]Can I use a foreach loop on Seed method operations with Entity Framework 6 - Update-Database command
[英]Seed method is not called on update-database, Entity Framework 6
我有以下DbContext
類。 關於EF的一切都運轉良好(遷移,關系等),唯一對我不起作用的是播種。 我嘗試了許多不同的解決方案,但似乎沒有任何效果。 有人知道嗎?
當我運行update-database時,似乎執行了seed方法,但數據庫中沒有任何更新。
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;
}
}
DropCreateDatabaseIfModelChanges IDatabaseInitializer的實現, 僅當自創建數據庫以來模型發生更改時 ,該實現將刪除,重新創建數據庫並有選擇地重新種子化數據庫 。
這可能會有所幫助。 Configuration類位於migrations文件夾內。
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);
}
}
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