在ASP.NET MVC中創建自定義RequestContext

Question

我使用ASP.NET MVC創建了一個CMS，並且通過設計，我決定每個插件（附加組件）在傳入的HTTP請求中都應該有一個鍵。因此，我在我的主機這個總路線應用：

{pluginKey}/{controller}/{action}/{id} 

我創建一個自定義控制器工廠，實現IControllerFactory，當然，它必須建立在ReqeustContext和控制器名稱控制器基礎的方法。但是，我想創建一個人爲的HttpContext（以及所有其他相關對象，如HttpRequest，RequestContext，RouteData等），以便插件控制器不會錯誤地誤解這些URL段。換句話說，我希望削減輸入URL的第一部分，使插件認爲他們正在處理此網址：

{controller}/{action}/{id} 

我怎樣才能做到這一點？

Answer 1

雖然您可以創建所有上下文類的新實現，但它似乎有點矯枉過正。爲什麼不使用在返回HttpHandler之前應用過濾功能的派生路由處理程序？以下是一個示例：

// To avoid conflicts with similarly named controllers, I find it to be good practice 
// to create a route constraint with the set of all plugin names. If you don't have 
// this function already, you should be able to access it with reflection (one time 
// per app lifecycle) or you hard-code them. The point is to have a regex which ensures 
// only valid plugins will get selected 
string[] pluginNames = GetPluginNames(); 
string pluginNameRegex = string.Join("|",pluginNames); 

Route pluginRoute = new Route (
    url: "{pluginKey}/{controller}/{action}/{id}", 
    defaults: null, 
    constraints: new RouteValueDictionary(new { pluginKey = pluginNameRegex }), 
    routeHandler: new PluginRouteHandler() 
}); 

// The custom route handler can modify your route data after receiving the RequestContext 
// and then send it to the appropriate location. Here's an example (markdown code/untested) 
// Note: You don't have to inherit from MvcRouteHandler (you could just implement IRouteHandler 
// but I'm assuming you want Mvc functionality as the fallback) 
public class PluginRouteHandler : MvcRouteHandler 
{ 
    public PluginRouteHandler(IControllerFactory controllerFactory) 
     : base(controllerFactory) 
    {} 

    protected override IHttpHandler GetHttpHandler(RequestContext requestContext){ 
     if(ValidatePluginRoute(requestContext)) 
     { 
      // we are going to remove the pluginKey from the RequestContext, It's probably wise 
      // to go ahead and add it to HttpContext.Items, in case you need the data later 
      requestContext.HttpContext.Items["pluginKey"] = requestContext.RouteData.Values["pluginKey"]; 

      // now let's get ride of it, so your controller factory will process the 
      // requestContext as you have described. 
      requestContext.Values.Remove("pluginKey"); 

      // the route will now be interpreted as described so let the flow go to the MvcRouteHandler's method 
     } 
     return base.GetHttpHandler(requestContext); 
    } 
    static bool ValidatePluginRoute(RequestContext requestContext){ 
     return requestContext.RouteData.ContainsKey("pluginKey"); 
    } 
}