Asp.net UseSqlServer 方法缺少 MVC 6

我正在try 在MVC6中实现实体框架7，在这一页上，它说要做here

services.AddEntityFramework()
    .AddSqlServer()
    .AddDbContext<MusicStoreContext>(options =>
                        options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]));

但对我来说，UseSqlServer方法是不可见的？有人知道如何让它可见吗？或者这是配置实体框架的旧方法？

我的startup.cs文件是这样的

using FluentValidation;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.Framework.ConfigurationModel;
using Microsoft.Framework.DependencyInjection;

namespace me.namespace.project
{
    public class Startup
    {
        public static IConfiguration Configuration { get; set; }

        public Startup(IHostingEnvironment env)
        {
            // Setup configuration sources.
            Configuration = new Configuration()
                .AddJsonFile("config.json")
                .AddEnvironmentVariables();
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();

            // entity framework
            services.AddEntityFramework()
                .AddSqlServer()
                .AddDbContext<DataContext>();

        }
    }
}