c# - MVC : The view found at '~/.../Index.cshtml' was not created

Question

我创建了一个模块化的 MVC 项目来在同一运行时加载其他特殊的 Web 项目。

其他项目位于网站根目录下名为“Modules”的文件夹中。我正在使用属性 PreApplicationStartMethod 在启动时将其他程序集加载到子目录中。

我添加了特殊的路由来定位每个具有命名空间约束的模块。

我创建了一个实现 RazorViewEngine 的类，以便在调用模块中的元素时覆盖 viewPath:~/Views/Home/Index.cshtml -> ~/Modules/ModuleTest/Views/Home/Index.cshtml。

动态加载库中的 Index() 方法已成功调用，但在呈现 View 时出现错误:

见下图:http://i.imgur.com/KoTgxg2.png

框架基本上告诉我 View 已经找到但是他不会渲染它。有谁知道为什么框架拒绝呈现它？

“/”应用程序中的服务器错误。

未创建位于“~/Modules/ModuleTest/Views/Home/Index.cshtml”的 View 。

描述:当前网络请求执行过程中出现未处理的异常。请查看堆栈跟踪以获取有关错误及其在代码中的来源的更多信息。

异常详细信息:System.InvalidOperationException:未创建位于“~/Modules/ModuleTest/Views/Home/Index.cshtml”的 View 。

• 异常(exception)

Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.Stack Trace: [InvalidOperationException: The view found at '~/Modules/ModuleTest/Views/Home/Index.cshtml' was not created.]   System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +362   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +431   System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +39   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +116   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +529   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +106   System.Web.Mvc.Async.c__DisplayClass28.b__19() +321   System.Web.Mvc.Async.c__DisplayClass1e.b__1b(IAsyncResult asyncResult) +185   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +42   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +133   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40   System.Web.Mvc.Controller.b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +34   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +44   System.Web.Mvc.Controller.b__15(IAsyncResult asyncResult, Controller controller) +39   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +62   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39   System.Web.Mvc.MvcHandler.b__4(IAsyncResult asyncResult, ProcessRequestState innerState) +39   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +40   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9514812   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408

• Controller

    public class HomeController : Controller
    {
        public ActionResult Index()
        {
           return View(new TestModel() { Value = "Bla" });
        }
    }

• 查看

    @using Easily.ModuleTest.Models;    @{ ViewBag.Title = "Test Index"; }    @model TestModel    @Model.Value

• CustomRazorViewEngine

    public class CustomRazorViewEngine : RazorViewEngine
    {
        public CustomRazorViewEngine()
        {
            List tmpViewLocationFormats = new List(ViewLocationFormats);
            List tmpMasterLocationFormats = new List(MasterLocationFormats);
            List tmpPartialViewLocationFormats = new List(PartialViewLocationFormats);
            foreach (string moduleDirectory in EasilyModulesContainer.Modules.Select(x => x.Directory))
            {
                foreach (string viewLocationFormat in ViewLocationFormats)
                    tmpViewLocationFormats.Add(viewLocationFormat.Replace("~/", string.Format("~/{0}/{1}/", Constants.ModulesDirectory, moduleDirectory)));
                foreach (string masterLocationFormat in MasterLocationFormats)
                    tmpMasterLocationFormats.Add(masterLocationFormat.Replace("~/", string.Format("~/{0}/{1}/", Constants.ModulesDirectory, moduleDirectory)));
                foreach (string partialViewLocationFormat in PartialViewLocationFormats)
                    tmpPartialViewLocationFormats.Add(partialViewLocationFormat.Replace("~/", string.Format("~/{0}/{1}/", Constants.ModulesDirectory, moduleDirectory)));
            }
            ViewLocationFormats = tmpViewLocationFormats.ToArray();
            MasterLocationFormats = tmpMasterLocationFormats.ToArray();
            PartialViewLocationFormats = tmpPartialViewLocationFormats.ToArray();
        }

        protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)
        {
            return base.CreateView(controllerContext, GetPath(controllerContext, viewPath), masterPath);
        }

        protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)
        {
            return base.CreatePartialView(controllerContext, GetPath(controllerContext, partialPath));
        }

        private string GetPath(ControllerContext controllerContext, string path)
        {
            if (!controllerContext.RouteData.Values.ContainsKey("_module"))
                return path;
            Module module = ModulesContainer.Modules.SingleOrDefault(x => x.Name == controllerContext.RouteData.GetRequiredString("_module"));
            return path.Replace("~/", string.Format("~/{0}/{1}/", Constants.ModulesDirectory, module.Directory));
        }
    }

Answer 1

我通过调试 http://aspnetwebstack.codeplex.com/ 发现了问题.

我实际上从 ModulesContainer 类中的 bin 之外的另一个文件夹加载了包含 Controller 的库(参见问题)。但是在 System.Web.Mvc.dll 中，一种方法尝试通过在默认目录中执行 Assembly.Load() 来查找我的 Controller 类型，这就是为什么 BuildManager.GetCompiledType() 返回 null。

我找到了一种简单的方法来覆盖这个方法:

AppDomain.CurrentDomain.AssemblyResolve += CurrentDomainAssemblyResolve;

和

private static Assembly CurrentDomainAssemblyResolve(object sender, ResolveEventArgs args)
    {
        if (args.RequestingAssembly != null)
            return args.RequestingAssembly;
        Module module = _modules.SingleOrDefault(x => x.Assembly.FullName == args.Name);
        if (module != null)
            return module.Assembly;
        throw new Exception(string.Format("Unable to load assembly {0}", args.Name));
    }

我只是在我的预构建 dll 缓存中查找已加载的程序集。