在ASP.NET MVC中创建自定义RequestContext

Question

我使用ASP.NET MVC创建了一个CMS，并且通过设计，我决定每个插件（附加组件）在传入的HTTP请求中都应该有一个键。因此，我在我的主机这个总路线应用：

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

我创建一个自定义控制器工厂，实现IControllerFactory，当然，它必须建立在ReqeustContext和控制器名称控制器基础的方法。但是，我想创建一个人为的HttpContext（以及所有其他相关对象，如HttpRequest，RequestContext，RouteData等），以便插件控制器不会错误地误解这些URL段。换句话说，我希望削减输入URL的第一部分，使插件认为他们正在处理此网址：

{controller}/{action}/{id} 

我怎样才能做到这一点？

Answer 1

虽然您可以创建所有上下文类的新实现，但它似乎有点矫枉过正。为什么不使用在返回HttpHandler之前应用过滤功能的派生路由处理程序？以下是一个示例：

// 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"); 
    } 
}