如何强制实体框架插入记录以在每个解决方案运行时清理数据库答案

【问题标题】：How to force Entity Framework insert records to clean database every solution run如何强制实体框架插入记录以在每个解决方案运行时清理数据库
【发布时间】：2014-08-03 13:59:30
【问题描述】：

在回答之前，请阅读整个问题。教程中的所有内容，堆栈 overflow 主题都不起作用。

我尝试强制实体框架在每次运行调试程序时将记录插入数据库，即使根本没有任何更改。这意味着如果我在上次运行期间进行任何更改，它们将消失。这不会发生。

我的 Global.asax：

 protected void Application_Start() {

            Database.SetInitializer(new MigrateDatabaseToLatestVersion<PersonContext, Configuration>()); 
            Database.SetInitializer(new DropCreateDatabaseAlways<PersonContext>());
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }

我的 Web.config 实体框架部分：

  <entityFramework>
    <contexts>
     <context type="WebApplication2.Models.PersonContext, WebApplication2">
        <databaseInitializer type="WebApplication2.Models.PersonInitializer, WebApplication2" />
      </context>
    </contexts>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>

我的种子方法：

   protected override void Seed(PersonContext context) {
            var persons = new List<Person> { 
             new Person{FirstName = "John", LastName = "Doe", CellNumber = "123-456-789", SecondaryPhoneNumber = "98873213", Address = "1street 2",BirthDate = DateTime.Now.Date, Pesel = "312312312", Notes = "Annoying"},
             new Person{FirstName = "Anna", LastName = "Doe", CellNumber = "113-456-789", SecondaryPhoneNumber = "98873213", Address = "1street 2",BirthDate = DateTime.Now.Date, Pesel = "548555672", Notes = "Less Annoying"}
            };

            persons.ForEach(person => context.Persons.Add(person));
            context.SaveChanges();

            var meetings = new List<Meeting>{
                new Meeting{PersonId = 1, Body = "Body of meeting", Date = DateTime.Now}
            };

            meetings.ForEach(meeting => context.Meetings.Add(meeting));
            context.SaveChanges();

            var statuses = new List<Status> {
                new Status{Name = "OK"},
                new Status {Name = "NOT_OK"}
            };

            statuses.ForEach(status => context.Statuses.Add(status));
            context.SaveChanges();
        }

编辑：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApplication2.Models {
    public class PersonInitializer : System.Data.Entity.DropCreateDatabaseIfModelChanges<PersonContext> {
        protected override void Seed(PersonContext context) {
            var persons = new List<Person> { 
             new Person{FirstName = "John", LastName = "Doe", CellNumber = "123-456-789", SecondaryPhoneNumber = "98873213", Address = "1street 2",BirthDate = DateTime.Now.Date, Pesel = "312312312", Notes = "Annoying"},
             new Person{FirstName = "Anna", LastName = "Doe", CellNumber = "113-456-789", SecondaryPhoneNumber = "98873213", Address = "1street 2",BirthDate = DateTime.Now.Date, Pesel = "548555672", Notes = "Less Annoying"}
            };

            persons.ForEach(person => context.Persons.Add(person));
            context.SaveChanges();

            var meetings = new List<Meeting>{
                new Meeting{PersonId = 1, Body = "Body of meeting", Date = DateTime.Now}
            };

            meetings.ForEach(meeting => context.Meetings.Add(meeting));
            context.SaveChanges();

            var statuses = new List<Status> {
                new Status{Name = "OK"},
                new Status {Name = "NOT_OK"}
            };

            statuses.ForEach(status => context.Statuses.Add(status));
            context.SaveChanges();
        }
    }
}

【问题讨论】：

包含Seed方法的类名是什么，该类的基类是什么？
@YuliamChandra 我在 OP 的 EDIT 中发布了完整的课程代码。执行迁移后调用 Seed 方法，因此我在数据库中有这些数据，但我希望它始终被调用。

标签： asp.net-mvc entity-framework seeding

【解决方案1】：

尝试替换

public class PersonInitializer :
   System.Data.Entity.DropCreateDatabaseIfModelChanges<PersonContext>

与

public class PersonInitializer :
   System.Data.Entity.DropCreateDatabaseAlways<PersonContext>

此代码将始终删除、重新创建和播种数据库。

PS：我认为配置中的初始化程序是优先级。

【讨论】：