WebAPI-从请求中手动解析控制器和操作

SessionStateBehavior 基于这样的动作属性:

    [HttpPost]
    [Route("api/test")]
    [SetSessionStateBehavior(SessionStateBehavior.Required)]    // <--- This modifies the behavior
    public async Task<int> Test(){}

然而,似乎唯一能改变会话行为的地方是 HttpApplication Application_PostAuthorizeRequest (或者在类似的地方,请求生存期的早期),否则我会得到以下错误:

'HttpContext.SetSessionStateBehavior' can only be invoked before 'HttpApplication.AcquireRequestState' event is raised.

所以,在这一点上没有控制器或动作解析,所以我不知道将调用什么动作来检查其属性。 所以,我想手动解决这个问题。

我先从这几行代码开始解析控制器:

 var httpCtx = HttpContext.Current;
 var ctrlSel = GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IHttpControllerSelector)) as IHttpControllerSelector;
 var actionSel = GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IHttpActionSelector)) as IHttpActionSelector;
 HttpControllerDescriptor controllerDescriptor = ctrlSel.SelectController(httpCtx.Request);

但在最后一行我找不到合适的 HttpRequestMessage 从请求中。 知道怎么弄的吗? 这不在控制器里,所以我没有准备好。 我正试图看到框架的反汇编代码来复制它的一部分,但是我在这一点上迷失了方向。。。

更新:

这是我最接近手动解析操作的一次,但它不起作用:

我已经注册了这两项服务:

            container.RegisterType<IHttpControllerSelector, DefaultHttpControllerSelector>();
            container.RegisterType<IHttpActionSelector, ApiControllerActionSelector>();

…并尝试获取所需的会话行为,如下所示:

    private  SessionStateBehavior GetDesiredSessionBehavior(HttpContext httpCtx)
    {
        var config = GlobalConfiguration.Configuration;
        var diResolver = config.Services;
        var ctrlSel = diResolver.GetService(typeof(IHttpControllerSelector)) as IHttpControllerSelector;
         var actionSel = diResolver.GetService(typeof(IHttpActionSelector)) as IHttpActionSelector;

        if (ctrlSel is null || actionSel is null)
        {
            return DefaultSessionBehavior;
        }


        var method = new HttpMethod(httpCtx.Request.HttpMethod);
        var requestMsg = new HttpRequestMessage(method, httpCtx.Request.Url);
        requestMsg.Properties.Add(HttpPropertyKeys.RequestContextKey, httpCtx.Request.RequestContext);
        requestMsg.Properties.Add(HttpPropertyKeys.HttpConfigurationKey, config);
        httpCtx.Request.Headers.Cast<string>().ForEach(x => requestMsg.Headers.Add(x, httpCtx.Request.Headers[x]));


        var httpRouteData = httpCtx.Request.RequestContext.RouteData;
        var routeData = config.Routes.GetRouteData(requestMsg);
        requestMsg.Properties.Add(HttpPropertyKeys.HttpRouteDataKey, routeData);
        requestMsg.SetRequestContext(new HttpRequestContext(){RouteData = routeData });
        requestMsg.SetConfiguration(config);
        var route = config.Routes["DefaultApi"];
        requestMsg.SetRouteData(routeData ?? route.GetRouteData(config.VirtualPathRoot, requestMsg));

        var routeHandler = httpRouteData.RouteHandler ?? new WebApiConfig.SessionStateRouteHandler();
        var httpHandler = routeHandler.GetHttpHandler(httpCtx.Request.RequestContext);
        if (httpHandler is IHttpAsyncHandler httpAsyncHandler)
        {
            httpAsyncHandler.BeginProcessRequest(httpCtx, ar => httpAsyncHandler.EndProcessRequest(ar), null);
        }
        else
        {
            httpHandler.ProcessRequest(httpCtx);
        }

        var values = requestMsg.GetRouteData().Values; // Hm this is empty and makes the next call fail...
        HttpControllerDescriptor controllerDescriptor = ctrlSel.SelectController(requestMsg);

        IHttpController controller = controllerDescriptor?.CreateController(requestMsg);
        if (controller == null)
        {
            return DefaultSessionBehavior;
        }

        var ctrlContext = CreateControllerContext(requestMsg, controllerDescriptor, controller);
        var actionCtx = actionSel.SelectAction(ctrlContext);
        var attr = actionCtx.GetCustomAttributes<ActionSessionStateAttribute>().FirstOrDefault();
        return attr?.Behavior ?? DefaultSessionBehavior;
    }

我有另一种方法来让它工作(从客户端发送头值来修改会话行为),但是如果上面的版本工作的话会更好。

最后,我根据客户机头值设置会话行为,并根据请求生存期中稍后的操作属性验证发送该头的有效性。如果有人能解决我在上面与之战斗的动作解析代码,请随意在这里发布答案。