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【正文】 hich HTTP Verb an action has to respond to. A possible scenario for a custom selector attribute is if you want to choose one action or another based on languages supported by the browser or based on the type of browser, for example whether it is a mobile browser or a desktop browser. 6. AuthorizationFilter These kind of filters are executed before the action is executed, and their role is to make sure the request is “valid”. 8 There are already a few Authorization filters inside the framework, the most “famous” of which is the Authorize attribute that checks whether the current user is allowed to execute the action. Another is the the ValidateAntiForgeryToken that prevents CSRF attacks. If you want to implement your own authorization schema, the interface you have to implement is IAuthorizationFilter. An example could be the hour of the day. 7. ActionFilter Action Filters are executed before and after an action is executed. One of the core filters is the OutputCache filter, but you can find many other usages for this filter. This is the most likely extension point you are going to use, as, IMHO, it’s critical to a good ponentization of views: the controller only has to do its main stuff, and all the other data needed by the view must be retrieved from inside action filters. 8. ModelBinder The default model binder maps HTTP parameters to action method parameters using their names: a parameter named will be mapped to the City property of the Address object that itself is a property of the method parameter named user. The DefaultModelBinder works also with arrays, and other list types. But it can be pushed even further: for example you might use it to convert the id of the person directly to the Person object looking up on the database. This approach is explained better in the following post Timothy Khouri (aka SingingEels): Model Binders in MVC. The code is based on the preview 5, but the concept remains the same. 12. ViewEngine Probably you are not going to write your own view engine, but there are a few that you might consider using instead of the default WebForm view engine. The most interesting one, IMHO, is Spark. But if you really want to write your own view engine, have a look at this post by Brad Wilson: Partial Rendering amp。處理管線（ processing pipeline）上的所有（或大多數(shù)）東西都是可替換的。 比如對(duì)日期的驗(yàn)證， url中可能會(huì)包含年、月、日，而你需要驗(yàn)證這三者是 否可以組合成一個(gè)有效的日期。default factory 會(huì)查找實(shí)現(xiàn)了 IController 并且以 Controller 結(jié)尾的類，然后通過反射使用無參構(gòu)造函數(shù)進(jìn)行實(shí)例化。默認(rèn)的 action invoker 通過方法名、 action名或其他可能的 selector attribute 來查找 action，然后調(diào)用 action方法以及定義的 filter，最終執(zhí)行得到 action result。 使用默認(rèn)的 action invoker 時(shí)， action的選擇是基于名稱的。 這種過濾器是在 action執(zhí)行之前執(zhí)行的，用來確保請(qǐng)求是有效的。例如，日期中的小時(shí)。 12 默認(rèn)的 model binder 使用參數(shù)名稱進(jìn)行 HTTP參數(shù)到 action方法參數(shù)的映射。 Timothy Khouri（網(wǎng)名 SingingEels）在他的文章 Model Binders in MVC中更好的闡述了這種方法。 與 ActionFilter類似， ResultFilters 在 ActionResult 前后執(zhí)行。 MVC 提供了很多 result 用來呈現(xiàn)視圖、 JSON、純文本、文件并重定向到其他action。 您可能不需要編寫自己的 view engine，但您也許可以考慮使用其他引擎來替代默認(rèn)的WebForm view engine。 13 視圖必須十分簡(jiǎn)單整潔，它們只能包含 html標(biāo)記并調(diào)用 HtmlHelper的輔助方法。 什么是 HtmlHelper輔助方法？其實(shí)就是 HtmlHelper 類的擴(kuò)展方法，這是唯一的要求。正如 Rob Conery所說：如果有 if，就構(gòu)造輔助方法（ If there39。 如果您確實(shí)希望編寫自己的 view engine，可以看一下 Brad Wilson 的文章 : Partial Rendering amp。例如，如果您希望將 PDF文件作為結(jié)果發(fā)送，您需要使用 PDF庫編寫能夠生成 PDF的 ActionResult。另外，比較常用的詮釋這種過濾器的示例是日志記錄。 所有的 Controller 均繼承自基類 Controller。DefaultModelBinder 也同 樣適用于數(shù)組和其他列表類型。 OutputCache過濾器是幾個(gè)核心過濾器之一。另一個(gè)是 用來阻止 CSRF攻擊的ValidateAntiForgeryToken。在框架中已經(jīng)包含了 AcceptVerbs 特性，它允許您指定使用哪一個(gè) HTTP Verb 來處理 action的響應(yīng)。因此，如果希望改變這些約定，如 action 方法的選擇邏輯、 參數(shù)映射到 action 參數(shù)的方式、選擇和執(zhí)行 filter的方式等，您需要擴(kuò)展該類并重寫需要修改的方法。 MvcContrib 和 Ninject Controller Facto
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