我正在关注本教程，并尝试在 userprofile 表中添加一些新列。我试图创建一个新表。
public class UsersContext : DbContext
{
public UsersContext()
: base("DefaultConnection")
{
}
public DbSet<UserProfile> UserProfiles { get; set; }
public DbSet<TestTabel> TestTabel { get; set; }
}
[Table("UserProfile")]
public class UserProfile
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int UserId { get; set; }
public string UserName { get; set; }
public string Mobile { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
}
[Table("TestTabel")]
public class TestTabel
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int TestId { get; set; }
public string TestName { get; set; }
public string TestMobile { get; set; }
}
比我尝试使用 update-database 命令在控制台更新数据库时，我得到了这个错误消息：
数据库中已经有一个名为“UserProfile”的对象。
未添加的新列和表均未添加。
我错过了什么？
[编辑] 我执行了 add-migration 和 update-database 命令，这就是结果（必须执行两次 update-database 命令，第二次详细说明）
PM> Add-Migration
cmdlet Add-Migration at command pipeline position 1
Supply values for the following parameters:
Name: test
Scaffolding migration 'test'.
The Designer Code for this migration file includes a snapshot of your current Code First model. This snapshot is used to calculate the changes to your model when you scaffold the next migration. If you make additional changes to your model that you want to include in this migration, then you can re-scaffold it by running 'Add-Migration 201304011714212_test' again.
PM> Update-Database
The project 'MVC4SimpleMembershipCodeFirstSeedingEF5' failed to build.
PM> Update-Database
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Applying code-based migrations: [201304011714212_test].
Applying code-based migration: 201304011714212_test.
Running Seed method.
PM> Update-Database -verbose
Using StartUp project 'MVC4SimpleMembershipCodeFirstSeedingEF5'.
Using NuGet project 'MVC4SimpleMembershipCodeFirstSeedingEF5'.
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Target database is: 'aspnet-MVC4SimpleMembershipCodeFirstSeedingEF5' (DataSource: ., Provider: System.Data.SqlClient, Origin: Configuration).
No pending code-based migrations.
Running Seed method.
PM>
[/编辑]
配置.cs：
namespace MVC4SimpleMembershipCodeFirstSeedingEF5.Migrations
{
internal sealed class Configuration : DbMigrationsConfiguration<UsersContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = true;
}
protected override void Seed(UsersContext context)
{
WebSecurity.InitializeDatabaseConnection(
"DefaultConnection",
"UserProfile",
"UserId",
"UserName", autoCreateTables: true);
if (!Roles.RoleExists("Administrator"))
Roles.CreateRole("Administrator");
if (!WebSecurity.UserExists("test"))
WebSecurity.CreateUserAndAccount(
"test",
"password",
new { Mobile = "+19725000374", FirstName = "test", LastName = "test" });
if (!Roles.GetRolesForUser("test").Contains("Administrator"))
Roles.AddUsersToRoles(new[] { "test" }, new[] { "Administrator" });
}
}
}
在 Filters 文件夹 1 cs 文件中：
namespace MVC4SimpleMembershipCodeFirstSeedingEF5.Filters
{
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false,
Inherited = true)]
public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
{
private static SimpleMembershipInitializer _initializer;
private static object _initializerLock = new object();
private static bool _isInitialized;
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
// Ensure ASP.NET Simple Membership is initialized only once per app start
LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock);
}
private class SimpleMembershipInitializer
{
public SimpleMembershipInitializer()
{
Database.SetInitializer<UsersContext>(null);
try
{
using (var context = new UsersContext())
{
if (!context.Database.Exists())
{
// Create the SimpleMembership database without Entity Framework migration schema
((IObjectContextAdapter)context).ObjectContext.CreateDatabase();
}
}
WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true);
}
catch (Exception ex)
{
throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex);
}
}
}
}
}
连接字符串：
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
上次迁移：
namespace MVC4SimpleMembershipCodeFirstSeedingEF5.Migrations
{
using System;
using System.Data.Entity.Migrations;
public partial class test : DbMigration
{
public override void Up()
{
CreateTable(
"dbo.TestTabel",
c => new
{
TestId = c.Int(nullable: false, identity: true),
TestName = c.String(),
TestMobile = c.String(),
})
.PrimaryKey(t => t.TestId);
}
public override void Down()
{
DropTable("dbo.TestTabel");
}
}
}