使用相同的数据库创建多个DbContext的表

Question

我想实现多个DbContext的目标相同的数据库。

它在第一个DbContext对象上调用DataBase.EnsureCreated（）时工作，但它不会为其余对象创建表。 后Init.Initalize（）我要包含两个表名为客户和地址

Initalize数据库的数据库：

public static class Init 
{ 
    public static void Initalize(BaseDbContext[] contexts, Config.Options.Environments environment) 
    {      
     if (environment == Config.Options.Environments.Development) 
     { 
      contexts[0].Database.EnsureDeleted(); 

      foreach(BaseDbContext context in contexts) 
      { 
       context.Database.EnsureCreated(); 
      } 

      var clients = new Client[] 
      { 
       new Client() { Key = Guid.NewGuid(), Name = "Smokers.no", DisplayName = "Smokers.no", Email = "post@smokers.no", LogoFilename = "logo.jpg" } 
      }; 

      foreach(BaseDbContext context in contexts) 
      { 
       if (context.GetType().Equals(typeof(Data.SharedDbContext))) 
       { 
        var cntx = context as Data.SharedDbContext; 
        foreach (Client client in clients) { cntx.Clients.Add(client); } 
        cntx.SaveChanges(); 
       } 
      } 


     } 
     else 
     { 
      foreach(BaseDbContext context in contexts) 
      { 
       context.Database.EnsureCreated(); 

       if (context.GetType().Equals(typeof(Data.SharedDbContext))) 
       { 
        var cntx = context as Data.SharedDbContext; 

        if (cntx.Clients.Any()) 
        { 
         return; 
        } 
       } 
      } 
     } 
    } 
} 

BaseDbContext：

public class BaseDbContext : DbContext 
{ 
    public BaseDbContext(DbContextOptions<BaseDbContext> options) : base(options) { } 
} 

SharedDbContext：

public class SharedDbContext : BaseDbContext 
{ 
    public SharedDbContext(DbContextOptions<BaseDbContext> options) : base(options) { } 

    #region DbSets 
    public DbSet<Client> Clients { get; set; } 
    #endregion 
} 

MailerDbContext：

public class MailerDbContext : BaseDbContext 
{ 
    SharedDbContext _context; 

    public MailerDbContext(DbContextOptions<BaseDbContext> options, SharedDbContext context) : base(options) 
    { 
     _context = context; 
    } 

    public SharedDbContext LCToolsContext 
    { 
     get 
     { 
      return _context; 
     } 
    } 

    #region DbSets 
    public DbSet<Address> Addresses { get; set; } 
    #endregion 
} 

Answer 1

您是否尝试过定义你设置ContextKey每个单独的上下文中的配置？

E.g：

public sealed class Configuration : DbMigrationsConfiguration<MyDataContext> 
{ 
public Configuration() 
{ 
    AutomaticMigrationsEnabled = false; 
    ContextKey = "MySpecialKey"; 
} 

//Seed method here.. 

} 

这样称呼它：

private static void InitializeDatabaseUsingEF() 
{ 

    System.Data.Entity.Database.SetInitializer(
    new System.Data.Entity.MigrateDatabaseToLatestVersion< 
     MyDataContext, 
     Migrations.Configuration>("ConnectionString.PostgreSql (Npgsql)")); 

    using (var db = new MyDataContext()) 
    { 
    db.Database.Initialize(true);   
    } 

} 

Answer 2

我最终改变了设计，现在一切正常。

Initalize数据库：

public static class Init 
{ 
    public static void Initalize(DbContext[] contexts, Config.Options.Environments environment) 
    {      
     if (environment == Config.Options.Environments.Development) 
     { 
      foreach(DbContext cntx in contexts) 
      { 
       if (cntx.GetType().Equals(typeof(GenericDbContext))) 
       { 
        cntx.Database.EnsureDeleted(); 
        cntx.Database.EnsureCreated(); 
       } 
      } 

      var clients = new Client[] 
      { 
       new Client() { Key = Guid.NewGuid(), Name = "Smokers.no", DisplayName = "Smokers.no", Email = "post@smokers.no", LogoFilename = "logo.jpg" } 
      }; 

      foreach(DbContext cntx in contexts) 
      { 
       if (cntx.GetType().Equals(typeof(GenericDbContext))) 
       { 
        var context = cntx as GenericDbContext; 
        foreach (Client client in clients) { context.Clients.Add(client); } 
        context.SaveChanges(); 
       } 
      } 
     } 
     else 
     { 
      foreach(DbContext cntx in contexts) 
      { 
       cntx.Database.EnsureCreated(); 

       if (cntx.GetType().Equals(typeof(GenericDbContext))) 
       { 
        var context = cntx as GenericDbContext; 
        if (context.Clients.Any()) 
        { 
         return; 
        } 
       } 
      } 
     } 
    } 
} 

GenericDbContext：

public class GenericDbContext : DbContext 
{ 
    public GenericDbContext(DbContextOptions<GenericDbContext> options) : base(options) { } 

    protected override void OnModelCreating(ModelBuilder builder) 
    { 
     builder.Entity<Models.Mailer.Address>().ToTable("MailerAddresses"); 
    } 

    public DbSet<Client> Clients { get; set; } 
    public DbSet<Models.Mailer.Address> MailerAddresses { get; set; } 
} 

MailerDbContext：

public class MailerDbContext : DbContext 
{ 
    public MailerDbContext(DbContextOptions<MailerDbContext> options, GenericDbContext generic) : base(options) 
    { 
     this.GenericDbContext = generic; 
    } 

    public GenericDbContext GenericDbContext { get; set; } 
}