MVC 5捆綁和Azure的CDN（查詢字符串）

我一直在關注這個教程：https://azure.microsoft.com/en-us/documentation/articles/cdn-serve-content-from-cdn-in-your-web-application/MVC 5捆綁和Azure的CDN（查詢字符串）

的一切都是偉大的，直到我注意到，捆綁的腳本和CSS文件與cache: no-cache，expires: -1和pragma: no-cache頭返回。當然，這與Azure無關。爲了證明這一點，我通過直接從我的網站訪問它們來測試捆綁包，而不是CDN - 即。 mysite.com/bundles/mybundle?v={myassemblyversion}。結果是一樣的。當我禁用CDN，並使用由MVC生成的v查詢字符串訪問捆綁文件時，標題符合預期：公共緩存，到期時間爲一年。

我試圖實現IBundleTransform接口，但context.BundleVirtualPath是隻讀的（即使它說獲取或設置虛擬路徑...）。我也嘗試修改Application_EndRequest()上的響應標題，但它也不起作用。我最後一個打賭是編寫IIS出站規則，但由於我的包（用於「自定義」v查詢字符串）不返回Last-Modified標頭，這也是徒勞的嘗試。

我的問題是：如果我想要將我的捆綁文件緩存在客戶端上 - 也就是說，直到v查詢字符串更改，我怎樣才能使用MVC捆綁Azure CDN？

來源

2016-02-21 Riwen

我知道我對比賽有點遲，但我找到了解決方法。我正在使用Frison B Alexander的代碼here。

問題是，一旦您重寫StyleBundles或ScriptBundles的查詢字符串，一年的默認緩存行爲將重置爲no-cache。這是通過重新生成每個捆綁包完全相同的查詢字符串來解決的，MVC框架在指定每個捆綁包的CDNPath時使用該查詢字符串。

下面是使用MVC Web App模板完成的過程。這裏是BundleConfig類：

public class BundleConfig 
    { 
     public static void RegisterBundles(BundleCollection bundles) 
     {    
      //we have to go ahead and add our Bundles as if there is no CDN involved. 
      //this is because the bundle has to already exist in the BundleCollection 
      //in order to get the hash that the MVC framework will generate for the 
      //querystring. 
      Bundle jsBundle = new ScriptBundle("~/scripts/js3").Include(
       "~/Scripts/jquery-{version}.js", 
       "~/Scripts/modernizr-*", 
       "~/Scripts/bootstrap.js", 
       "~/Scripts/respond.js"); 
      bundles.Add(jsBundle); 

      Bundle cssBundle = new StyleBundle("~/content/css3").Include(
         "~/Content/bootstrap.css", 
         "~/Content/site.css"); 
      bundles.Add(cssBundle); 

#if Debug 
      bundles.UseCdn = false; 
#else 
      bundles.UseCdn = true; 
      //grab our base CDN hostname from web.config... 
      string cdnHost = ConfigurationManager.AppSettings["CDNHostName"]; 

      //get the hashes that the MVC framework will use per bundle for 
      //the querystring. 
      string jsHash = GetBundleHash(bundles, "~/scripts/js3"); 
      string cssHash = GetBundleHash(bundles, "~/content/css3"); 

      //set up our querystring per bundle for the CDN path. 
      jsBundle.CdnPath = cdnHost + "/scripts/js3?v=" + jsHash; 
      cssBundle.CdnPath = cdnHost + "/content/css3?v=" + cssHash; 
#endif 
     } 

     //Frison B Alexander's code: 
     private static string GetBundleHash(BundleCollection bundles, string bundlePath) 
     { 

      //Need the context to generate response 
      var bundleContext = new BundleContext(new HttpContextWrapper(HttpContext.Current), BundleTable.Bundles, bundlePath); 

      //Bundle class has the method we need to get a BundleResponse 
      Bundle bundle = BundleTable.Bundles.GetBundleFor(bundlePath); 
      var bundleResponse = bundle.GenerateBundleResponse(bundleContext); 

      //BundleResponse has the method we need to call, but its marked as 
      //internal and therefor is not available for public consumption. 
      //To bypass this, reflect on it and manually invoke the method 
      var bundleReflection = bundleResponse.GetType(); 

      var method = bundleReflection.GetMethod("GetContentHashCode", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); 

      //contentHash is whats appended to your url (url?###-###...) 
      var contentHash = method.Invoke(bundleResponse, null); 
      return contentHash.ToString(); 
     } 
    }

來源

2017-04-03 17:15:07

MVC 5捆綁和Azure的CDN（查詢字符串）

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