实体框架种子方法不起作用

Question

我使用的是代码第一次迁移方法，并且存在填充数据的问题。 正在命令update-database上创建数据库/表，但数据未被插入。

这里是代码

internal sealed class Configuration : DbMigrationsConfiguration<webapp_sample.Models.ApplicationDbContext> 
    { 
     public Configuration() 
     { 
      AutomaticMigrationsEnabled = false; 
      //ContextKey = "webapp_sample.Models.ApplicationDbContext"; 
     } 

     protected override void Seed(webapp_sample.Models.ApplicationDbContext context) 
     { 

      context.Companies.AddOrUpdate(p => p.Name, 
       new Models.Company { CompanyId = 1, Name = "ABC Traders" }, 
       new Models.Company { CompanyId = 2, Name = "XYZ Traders" } 
       ); 
      context.Divisions.AddOrUpdate(p => p.Name, 
       new Models.Division { CompanyId = 1, DivisionId = 1, Name = "IT" }, 
       new Models.Division { CompanyId = 1, DivisionId = 2, Name = "Purchasing" }, 
       new Models.Division { CompanyId = 1, DivisionId = 3, Name = "Finance" }, 
       new Models.Division { CompanyId = 1, DivisionId = 4, Name = "Production" }, 
       new Models.Division { CompanyId = 1, DivisionId = 5, Name = "Retail" }, 
       new Models.Division { CompanyId = 2, DivisionId = 6, Name = "HR" }, 
       new Models.Division { CompanyId = 2, DivisionId = 7, Name = "Cafe" }, 
       new Models.Division { CompanyId = 2, DivisionId = 8, Name = "Projects" } 
       ); 
      context.SubDivisions.AddOrUpdate(p => p.Name, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 1, SubDivisionId = 1, Name = "Application" }, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 1, SubDivisionId = 2, Name = " Infra" }, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 1, SubDivisionId = 3, Name = "MIS" }, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 2, SubDivisionId = 1, Name = "Purchasing" }, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 3, SubDivisionId = 1, Name = "Finance" }, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 4, SubDivisionId = 1, Name = "Production" }, 
       new Models.SubDivision { CompanyId = 1, DivisionId = 5, SubDivisionId = 1, Name = "Retail" }, 
       new Models.SubDivision { CompanyId = 2, DivisionId = 5, SubDivisionId = 1, Name = "Admin" }, 
       new Models.SubDivision { CompanyId = 2, DivisionId = 6, SubDivisionId = 1, Name = "Cafe" }, 
       new Models.SubDivision { CompanyId = 2, DivisionId = 7, SubDivisionId = 1, Name = "Projects" } 
       ); 
     } 


    } 

和ApplicationDbContext文件，如下

public class ApplicationDbContext : IdentityDbContext<ApplicationUser> 
    { 
     public ApplicationDbContext() 
      : base("DefaultConnection", throwIfV1Schema: false) 
     { 
     } 
     protected override void OnModelCreating(DbModelBuilder modelBuilder) 
     { 
      modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>(); 



      modelBuilder.Entity<ApplicationUser>().Property(a => a.Latitude).HasPrecision(18, 9); 
      modelBuilder.Entity<ApplicationUser>().Property(a => a.Longitude).HasPrecision(18, 9); 

      base.OnModelCreating(modelBuilder); 

     } 
     public static ApplicationDbContext Create() 
     { 
      return new ApplicationDbContext(); 
     } 


     public DbSet<Company> Companies { get; set; } 

     public DbSet<Division> Divisions { get; set; } 


     public DbSet<SubDivision> SubDivisions { get; set; } 

     public System.Data.Entity.DbSet<webapp_sample.Models.MainMenu> MainMenus { get; set; } 
    } 

Answer 1

你使用EF7？

您可以创建一个类：

public class DataInitializer 
{ 
     webapp_sample.Models.ApplicationDbContext _context 

     public void InitializeDataAsync(IServiceProvider serviceProvider) 
     { 
      _context = serviceProvider.GetService<webapp_sample.Models.ApplicationDbContext>(); 
      // Add the code for inintializing at here 
      ... 
     } 
} 

而且你需要使用_context.SaveChanges（）;.

在Startup.cs文件，你可以做出头如下：

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) 
{ 
      ... 
      DataInitializer dataseed = new DataInitializer(); 
      dataseed.InitializeDataAsync(app.ApplicationServices); 
} 

希望这有助于！