public class BundleConfig
{
    public static void RegisterBundles(BundleCollection bundles)
    {
        // base bundles that come with MVC 4

        var bootstrapBundle = new Bundle("~/bundles/bootstrap").Include("~/Content/less/bootstrap.less");
        bootstrapBundle.Transforms.Add(new TwitterBootstrapLessTransform());
        bootstrapBundle.Transforms.Add(new CssMinify());
        bundles.Add(bootstrapBundle);
    }
}

TwitterBootsrapLessTransform如下(它比我想要的更复杂，因为需要将sub.less文件导入到dotLess)

public class TwitterBootstrapLessTransform : IBundleTransform
{
    public static string BundlePath { get; private set; }

    public void Process(BundleContext context,BundleResponse response)
    {
        setBasePath(context);

        var config = new DotlessConfiguration(DotlessConfiguration.GetDefault());
        config.LessSource = typeof(TwitterBootstrapLessMinifyBundleFileReader);

        response.Content = Less.Parse(response.Content,config);
        response.ContentType = "text/css";
    }

    private void setBasePath(BundleContext context)
    {
        BundlePath = context.HttpContext.Server.MapPath("~/Content/less" + "/imports" + "/");
    }
}

public class TwitterBootstrapLessMinifyBundleFileReader : IFileReader
{
    public IPathResolver PathResolver { get; set; }
    private string basePath;

    public TwitterBootstrapLessMinifyBundleFileReader(): this(new RelativePathResolver())
    {
    }

    public TwitterBootstrapLessMinifyBundleFileReader(IPathResolver pathResolver)
    {
        PathResolver = pathResolver;
        basePath = TwitterBootstrapLessTransform.BundlePath;
    }

    public bool DoesFileExist(string fileName)
    {
        fileName = PathResolver.GetFullPath(basePath + fileName);

        return File.Exists(fileName);
    }

    public byte[] GetBinaryFileContents(string fileName)
    {
        throw new System.NotImplementedException();
    }

    public string GetFileContents(string fileName)
    {
        fileName = PathResolver.GetFullPath(basePath + fileName);

        return File.ReadAllText(fileName);
    }
}

在我的基地_Layout.cshtml页面上，我尝试通过这样做来呈现css文件

@Styles.Render("~/bundles/bootstrap");

如mvc tutorial所建议的，客户端浏览器最终请求的文件是

http://localhost:53729/Content/less/bootstrap.less

这会导致错误。如果我将以下链接放入基本布局页面，它按预期工作。

<link href="~/bundles/bootstrap" rel="stylesheet" type="text/css" />

为什么@ Styles.Render()在调试模式下的行为方式相同？它在释放模式下工作。我可以理解你如何不想在调试中进行捆绑和缩小，但是如何强制这个捆绑包总是以同样的方式工作？