我正在开发一个在Visual Studio 2010开始的MVC 4项目。现在我正在使用Visual Studio 2012的机器，因为我没有访问我最初工作的机器。我试图一整天早上找到答案，但他们似乎并没有帮助我的情况。
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"));
}
}
}
