asp.net-mvc – System.Web.Optimization和Microsoft.Web.Optimi

我按照How to add reference to System.Web.Optimization for MVC-3-converted-to-4 app和从nuget安装到我的解决方案。即使我已经在我的机器上下载并安装了所有必需的参考软件包，System.Web.Optimization仍然缺少。还有什么我可以做吗？

编辑：当我尝试构建项目时，我收到以下错误

>类型或命名空间名称“Optimization”不存在于命名空间“System.Web”中(是否缺少程序集引用？) – BundleConfig.cs
>类型或命名空间名称“Optimization”不存在于命名空间“System.Web”中(是否缺少程序集引用？) – Global.asax.cs
>无法找到类型或命名空间“BundleCollection”(是否缺少using指令或程序集引用？) – BundleConfig.cs

我的BundleConfig.cs包含

using System.Web;
using System.Web.Optimization;

namespace BCCDC_AdminTool
{
    public class BundleConfig
    {
     // For more information on Bundling,visit http://go.microsoft.com/fwlink/?    LinkId=254725
    public static void RegisterBundles(BundleCollection bundles)
    {
           bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                    "~/Scripts/jquery-{version}.js"));

           bundles.Add(new ScriptBundle("~/bundles/jqueryui").Include(
                    "~/Scripts/jquery-ui-{version}.js"));

            bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(
                    "~/Scripts/jquery.unobtrusive*","~/Scripts/jquery.validate*"));

        // Use the development version of Modernizr to develop with and learn from. Then,when you're
        // ready for production,use the build tool at http://modernizr.com to pick only the tests you need.
            bundles.Add(new ScriptBundle("~/bundles/modernizr").Include(
                    "~/Scripts/modernizr-*"));

            bundles.Add(new StyleBundle("~/Content/css").Include("~/Content/site.css"));

            bundles.Add(new StyleBundle("~/Content/themes/base/css").Include(
                    "~/Content/themes/base/jquery.ui.core.css","~/Content/themes/base/jquery.ui.resizable.css","~/Content/themes/base/jquery.ui.selectable.css","~/Content/themes/base/jquery.ui.accordion.css","~/Content/themes/base/jquery.ui.autocomplete.css","~/Content/themes/base/jquery.ui.button.css","~/Content/themes/base/jquery.ui.dialog.css","~/Content/themes/base/jquery.ui.slider.css","~/Content/themes/base/jquery.ui.tabs.css","~/Content/themes/base/jquery.ui.datepicker.css","~/Content/themes/base/jquery.ui.progressbar.css","~/Content/themes/base/jquery.ui.theme.css"));
        }
    }
}