EF 4.1 升级后代码首次问题

Question

好的，我刚刚通过 NuGet 升级到 EF Code First 4.1，现在我的 JobSiteContext.cs 类中出现以下构建错误：

“名称 'DbDatabase' 在当前上下文中不存在”

这里是我的代码：

public class JobSiteContext : DbContext
{
    public DbSet<JobSite.Models.Job> Jobs { get; set; }

    public DbSet<JobSite.Models.Location> Locations { get; set; }

    public DbSet<JobSite.Models.Profile> Profiles { get; set; }

    public JobSiteContext()
    {
        // Instructions:
        //  * You can add custom code to this file. Changes will *not* be lost when you re-run the scaffolder.
        //  * If you want to regenerate the file totally, delete it and then re-run the scaffolder.
        //  * You can delete these comments if you wish
        //  * If you want Entity Framework to drop and regenerate your database automatically whenever you 
        //    change your model schema, uncomment the following line:
            DbDatabase.SetInitializer(new DropCreateDatabaseIfModelChanges<JobSiteContext>());
    }
}

任何人都可以指出我正确的方向吗？

谢谢保罗

Answer 1

现在它只是数据库。

请参阅此处：http://blogs .msdn.com/b/adonet/archive/2011/03/15/ef-4-1-release-candidate-available.aspx

Answer 2

public class Initializer : IDatabaseInitializer<AuthenticationContext>
        {
            public void InitializeDatabase(AuthenticationContext context)
            {
                if (context.Database.Exists() && !context.Database.CompatibleWithModel(false))
                    context.Database.Delete();

                if (!context.Database.Exists())
                {
                    context.Database.Create();

                }
            }
        }