播种数据实体框架指南

Question

启动dropcreatedatabase时，我遇到了播种某些常量数据的问题。我查看了一些类似的问题，但我很难理解为什么我的代码无效。

非常感谢所有帮助（c：

这是我的带有种子数据的SampleData模型

public class SampleData : DropCreateDatabaseIfModelChanges<fotmEntities>
{
    protected override void Seed(fotmEntities context)
    {
        var genres = new List<Genre>
        {
            new Genre { Name = "Specials" },
            new Genre { Name = "Online" },
            new Genre { Name = "Services" },
            new Genre { Name = "Food" },
            new Genre { Name = "Misc" },
            new Genre { Name = "Auto" }
        };var localities = new List<Locality>

        {
            new Locality { Name = "Location1" },
            new Locality { Name = "Location2" },
            new Locality { Name = "Location3" },
            new Locality { Name = "Location4" },

        };

        new List<Discount>
        {
            new Discount { Title = "Title A", Genre = genres.SingleOrDefault(g => g.Name == "Specials"), Information = "8.99M", Locality = localities.Single(a => a.Name == "Location1"), DiscountArtUrl = "/Content/img/placeholder.gif" },
            new Discount { Title = "Title B", Genre = genres.SingleOrDefault(g => g.Name == "Specials"), Information = "8.99M", Locality = localities.Single(a => a.Name == "Location2"), DiscountArtUrl = "/Content/img/placeholder.gif" },
            new Discount { Title = "Title C", Genre = genres.SingleOrDefault(g => g.Name == "Services"), Information = "8.99M", Locality = localities.Single(a => a.Name == "Location3"), DiscountArtUrl = "/Content/img/placeholder.gif" },
            new Discount { Title = "Title D", Genre = genres.SingleOrDefault(g => g.Name == "Food"), Information = "8.99M", Locality = localities.Single(a => a.Name == "Location4"), DiscountArtUrl = "/Content/img/placeholder.gif" },
            new Discount { Title = "Title E", Genre = genres.SingleOrDefault(g => g.Name == "Misc"), Information = "8.99M", Locality = localities.Single(a => a.Name == "Location1"), DiscountArtUrl = "/Content/img/placeholder.gif" },
            new Discount { Title = "Title F", Genre = genres.SingleOrDefault(g => g.Name == "Auto"), Information = "8.99M", Locality = localities.Single(a => a.Name == "Location2"), DiscountArtUrl = "/Content/img/placeholder.gif" },
        }.ForEach(a => context.Discounts.Add(a));

这是我的上下文模型：

using System.Data.Entity;

public class fotmEntities : DbContext
{
    public DbSet<Discount> Discounts { get; set; }
    public DbSet<Genre> Genres { get; set; }

    public DbSet<Locality> Localities { get; set; }
}

和我的Global.asx

protected void Application_Start()
    {
        System.Data.Entity.Database.SetInitializer(
            new fotm.Models.SampleData());
        AreaRegistration.RegisterAllAreas();
        RegisterGlobalFilters(GlobalFilters.Filters);
        RegisterRoutes(RouteTable.Routes);
    }