Question

我一直在寻找并寻找答案，而且有多个但我无法通过解决这些问题的解决方案来解决问题。我的问题是数据没有播种到数据库。数据库工作并创建表，但不会将数据库初始化程序中的数据放入其中。

上下文类

using System.Data.Entity;

namespace FlextrafikWeb.Models
{
    public class Context : DbContext
    {
        public Context() : base("FlextrafikWeb") { }

        public DbSet<Car> Cars { get; set; }
        public DbSet<User> Users { get; set; }
        public DbSet<Location> Locations { get; set; }
        public DbSet<Price> Prices { get; set; }
    }

}

数据库初始化程序

using System.Collections.Generic;
using System.Data.Entity;

namespace FlextrafikWeb.Models
{

    public class DatabaseInitializer :     DropCreateDatabaseIfModelChanges<Context>
    {
        protected override void Seed(Context context)

        {
            GetUsers().ForEach(u => context.Users.Add(u));
            GetCars().ForEach(c => context.Cars.Add(c));
            GetLocations().ForEach(l => context.Locations.Add(l));
            GetPrices().ForEach(p => context.Prices.Add(p));

            context.SaveChanges();
        }

        private static List<Car> GetCars()
        {
            var cars = new List<Car>
        {
            new Car
            {
                CarID = 1,
                GaranteeCarNumber = 2,
                RegistrationNumber = 123456,
                ContactTelephone = "12 34 56 78",
                CarType = 1,
                CarLocation = null,
                CarPrice = null,
                CarOwner = null,
                UserID = 1,
            },

            new Car
            {
                CarID = 3,
                GaranteeCarNumber = 4,
                RegistrationNumber = 654321,
                ContactTelephone = "87 65 43 21",
                CarType = 2,
                CarLocation = null,
                CarPrice = null,
                CarOwner = null,
                UserID = 2,
            },

        };

            return cars;
        }

        private static List<User> GetUsers()
        {
            var users = new List<User>
        {
            new User
            {
                UserID = 1,
                UserName = "Firma A",
                CompanyCVR = 12345678
            },

            new User
            {
                UserID = 2,
                UserName = "Firma B",
                CompanyCVR = 98765432
            }
        };

            return users;
        }

        private static List<Location> GetLocations()
        {
            var locations = new List<Location>
        {
            new Location
            {
                LocationID = 1,
                StreetName = "Testgade",
                StreetNumber = 4,
                PostalCode = 5000,
                City = "Odense",
                Municipality = "Odense",
            },

              new Location
            {
                LocationID = 2,
                StreetName = "Testvej",
                StreetNumber = 34,
                PostalCode = 5300,
                City = "Kerteminde",
                Municipality = "Kerteminde",
            }
        };

            return locations;
        }

        private static List<Price> GetPrices()
        {
            var prices = new List<Price>
        {
            new Price
            {
                PriceID = 1,
                StartupFeeWeekday = 30.00,
                RunningRateWeekday = 330.00,
                WaitingRateWeekday = 250.00,
                StartupFeeEvening = 60.00,
                RunningRateEvening = 500.00,
                WaitingRateEvening = 400.00,
                StartupFeeWeekend = 600.00,
                RunningRateWeekend = 500.00,
                WaitingRateWeekend = 400.00,
            },

                new Price
            {
                PriceID = 2,
                StartupFeeWeekday = 10.00,
                RunningRateWeekday = 249.00,
                WaitingRateWeekday = 249.00,
                StartupFeeEvening = 20.00,
                RunningRateEvening = 269.00,
                WaitingRateEvening = 269.00,
                StartupFeeWeekend = 20.00,
                RunningRateWeekend = 269.00,
                WaitingRateWeekend = 269.00,
            },
        };

            return prices;

        }
    }
}

全局

    using System.Web.Security;
using System.Web.SessionState;
using System.Data.Entity;
using FlextrafikWeb.Models;

namespace FlextrafikWeb
{
    public class Global : HttpApplication
    {
        void Application_Start(object sender, EventArgs e)
        {
            // Code that runs on application startup
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            // Initialize the product database.
            Database.SetInitializer(new DatabaseInitializer());


        }
    }
}

我不知道你还需要什么，但我似乎无法想出任何作品。

Answer 1

这里有两件事：

数据库初始化程序仅在数据库重新创建时，在您的情况下，初始化程序将在您的数据模型更改时启动，始终重新创建和播种数据库，更改初始化程序以从dropcreate数据库继承初始化程序。
您需要在dbcontect构造函数中专门设置初始化器（很可能是通过静态构造函数）

本教程应为您提供更多详细信息http://www.entityframeworktutorial.net/code-first/database-initialization-strategy-in-code-first.aspx

希望这有帮助

Answer 2

您应该在上下文类的构造函数中设置自定义初始化程序的使用：

using System.Data.Entity;

namespace FlextrafikWeb.Models
{
    public class Context : DbContext
    {
        public Context() : base("FlextrafikWeb")
        {
            Database.SetInitializer(new DatabaseInitializer());
        }

        public DbSet<Car> Cars { get; set; }
        public DbSet<User> Users { get; set; }
        public DbSet<Location> Locations { get; set; }
        public DbSet<Price> Prices { get; set; }
    }
}

数据库初始化程序没有播种

2 个答案: