如何将ASP.NET MVC控制器操作的结果添加到Bundle？

Question

我有一个控制器动作,返回Javascript文件.我可以从我的视图中引用此文件,它工作正常.我想把它与其他JS文件一起放在System.Web.Optimization.Bundle中.

我试图这样做,基本上:

new Bundle().Include("~/DynamicScript/UrlDictionary");

我的Bundle中的其他文件被渲染得很好,但是这个被忽略了.看到这种行为,我的假设是在应用程序能够通过路由基础结构解析URL之前处理捆绑,或者捆绑组件不会以允许该解决方案发生的方式请求文件.

如果有人能够为我确认这一点和/或在这里向我指出一个好的方向,那将非常感激.

Answer 1

我认为这是非常可行的 - 但在我进入我的解决方案之前 - 请记住,捆绑包是在第一次打击时创建的并且被重用 - 这意味着任何"动态"脚本仍然必须是全局的(即它不能依赖于特定用户等).这就是为什么它通常只允许静态js文件.说...我可以想象你可能想要在你的js中粘贴变量如版本号或类似的东西(尽管在那种情况下我个人只会使用Ajax/JSON来获取它).

我认为解决这个问题的方法是从Bundle创建派生类型.在其中,您将覆盖EnumerateFiles方法.最初,您将枚举base.EnumerateFiles,然后包含您自己的虚拟文件.

类似的东西(注意:没有经过测试的代码):

public class VirtualMethodBundle : Bundle
{
    private List<VirtualFile> _virtualContent = new List<VirtualFile>();

    public override IEnumerable<VirtualFile> EnumerateFiles(BundleContext context)
    {
        foreach(var file in base.EnumerateFiles(context))
        {
            yield return file;
        }

        foreach(var virtual in _virtualContent)
        {
            yield return virtual;
        }
    }

    public void AddCustomFile(VirtualFile file)
    {
        _virtualContent.Add(method);
    }
}

然后你会有一个特殊的VirtualFile定义类型,它会覆盖Open/Name方法并在那里返回你的动态内容......就像.

public class MethodBasedVirtualFile : VirtualFile
{
    private readonly Func<string> _contentFactory;
    private readonly string _path;

    public MethodBasedVirtualFile(string path, Func<string> contentFactory)
    {
        _path = path;
        _contentFactory = contentFactory;
    }

    public override string Name { get { return _path; } }

    public override Stream Open()
    {
        MemoryStream stream = new MemoryStream();
        StreamWriter writer = new StreamWriter(stream);
        writer.Write(_contentFactory());
        writer.Flush();
        stream.Position = 0;
        return stream;
    }
}

那么你可以使用它......

var bundle = new VirtualMethodBundle();
bundle.Include(... real files ...);
bundle.AddCustomFile(
    new MethodBasedVirtualFile("~/DynamicScript/UrlDictionary",
    ... the method that creates the content of that script...)
);

如果你聪明,你可以制作一个UrlVirtualFile,它接受url路径并使用MVC在需要时自动获取内容.

Answer 2

这是我针对此场景所做的操作。我定义了一个“Bundle Result”，然后在我的控制器方法中，仅按名称返回了一个 Bundle。我使用 ETags（If-None-Match Header）作为客户端缓存的优化。

例如：

public ActionResult ReturnFooBundle()
{
    return new BundleResult("foo", TimeSpan.FromDays(7));
}

这是 BundleResult 的实现：

public class BundleResult
    : ActionResult
{
    private class BundleInfo
    {
        public string BundleETag;
        public DateTime LastModified;
        public Bundle TheBundle;
        public BundleResponse Response;
    }

    private static Dictionary<string, BundleInfo> _bundleCache = new Dictionary<string, BundleInfo>();

    public string BundleName { get; private set; }
    public TimeSpan CacheExpiry { get; private set; }

    public BundleResult(string bundleName, TimeSpan cacheExpiry)
    {
        BundleName = bundleName;
        CacheExpiry = cacheExpiry;
    }
    public override void ExecuteResult(ControllerContext context)
    {
        context.HttpContext.Response.Clear();
        BundleInfo bundleInfo = GetBundle(context.HttpContext);

        string requestETag = context.HttpContext.Request.Headers["If-None-Match"];
        if (!string.IsNullOrEmpty(requestETag) && (requestETag == bundleInfo.BundleETag))
        {
            context.HttpContext.Response.StatusCode = (int)HttpStatusCode.NotModified;
            context.HttpContext.Response.StatusDescription = "Not Modified";
            return;
        }
        else
        {
            BundleResponse bundleResponse = bundleInfo.Response;
            HttpResponseBase response = context.HttpContext.Response;
            response.Write(bundleResponse.Content);
            response.ContentType = bundleResponse.ContentType;

            HttpCachePolicyBase cache = response.Cache;
            cache.SetCacheability(HttpCacheability.ServerAndPrivate);
            cache.SetLastModified(bundleInfo.LastModified);
            cache.SetETag(bundleInfo.BundleETag);
        }
    }

    private BundleInfo GetBundle(HttpContextBase context)
    {
        // lookup the BundleResponse
        BundleInfo retVal;
        lock (_bundleCache)
        {
            _bundleCache.TryGetValue(BundleName, out retVal);
        }
        if(retVal != null)
        {
#if DEBUG
            // see if the contents have been modified.
            BundleContext bundleContext = new BundleContext(context, BundleTable.Bundles, BundleName);
            DateTime lastModified = retVal.TheBundle.EnumerateFiles(bundleContext).Select(fi => fi.LastWriteTimeUtc).Max();
            if (lastModified > retVal.LastModified)
            {
                // regenerate the bundleInfo
                retVal = null;
            }
#endif
        }
        if (retVal == null)
        {
            string rawBundleName = BundleTable.Bundles.ResolveBundleUrl(BundleName);
            string hash = rawBundleName.Substring(rawBundleName.IndexOf("?v=") + 3);
            Bundle bundle = BundleTable.Bundles.GetBundleFor(BundleName);
            BundleContext bundleContext = new BundleContext(context, BundleTable.Bundles, BundleName);
            BundleResponse bundleResponse = bundle.GenerateBundleResponse(bundleContext);
            DateTime lastModified = bundle.EnumerateFiles(bundleContext).Select(fi => fi.LastWriteTimeUtc).Max();
            retVal = new BundleInfo
            {
                BundleETag = hash,
                Response = bundleResponse,
                TheBundle = bundle,
                LastModified = lastModified,
            };
            lock (_bundleCache)
            {
                _bundleCache[BundleName] = retVal;
            }
        }
        return retVal;
    }
}

Answer 3

捆绑系统仅支持物理文件而不支持应用程序路由。