无法投射“ASP._Page__ViewStart_cshtml”类型的对象来键入“System.Web.WebPages.StartPage”。错误

Question

，我发现了无法转换

类型的对象

ASP._Page__ViewStart_cshtml为键入” System.Web.WebPages.StartPage“

运行我的MVC应用程序

。

每一个答案，我发现，当搜寻告诉我，确保我_ViewStart文件是在我的查看文件夹，它是。更奇怪的是，我将我以前的Win 7 PC完全相同的项目文件复制到我的新Win 10笔记本电脑上。该应用程序在旧PC上运行良好，但在新笔记本电脑上出现上述错误。我也从Visual Studio 2015运行。

任何其他想法？

完整的错误消息：

[InvalidCastException: Unable to cast object of type 'ASP._Page__ViewStart_cshtml' to type 'System.Web.WebPages.StartPage'.] 
    System.Web.WebPages.StartPage.GetStartPage(WebPageRenderingBase page, String fileName, IEnumerable`1 supportedExtensions) +236 
    System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +163 
    System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107 
    System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13 
    System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() +23 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +245 
    System.Web.Mvc.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b() +22 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +176 
    System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +311 
    System.Web.Mvc.Controller.ExecuteCore() +105 
    System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +88 
    System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10 
    System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +34 
    System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +16 
    System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50 
    System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +28 
    System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7 
    System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +23 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +59 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9765901 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 

Web配置在浏览文件夹：

<?xml version="1.0"?> 

<configuration> 
    <configSections> 
    <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
     <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" /> 
     <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" /> 
    </sectionGroup> 
    </configSections> 

    <system.web.webPages.razor> 
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
    <pages pageBaseType="System.Web.Mvc.WebViewPage"> 
     <namespaces> 
     <add namespace="System.Web.Mvc" /> 
     <add namespace="System.Web.Mvc.Ajax" /> 
     <add namespace="System.Web.Mvc.Html" /> 
     <add namespace="System.Web.Routing" /> 
     <add namespace="DevExpress.Utils" /> 
     <add namespace="DevExpress.Web.ASPxClasses" /> 
     <add namespace="DevExpress.Web.ASPxGridView" /> 
     <add namespace="DevExpress.Web.ASPxGridView.Export" /> 
     <add namespace="DevExpress.Web.ASPxEditors" /> 
     <add namespace="DevExpress.Web.ASPxCallbackPanel" /> 
     <add namespace="DevExpress.Web.ASPxMenu" /> 
     <add namespace="DevExpress.Web.ASPxNavBar" /> 
     <add namespace="DevExpress.Web.ASPxPopupControl" /> 
     <add namespace="DevExpress.Web.ASPxRoundPanel" /> 
     <add namespace="DevExpress.Web.ASPxSplitter" /> 
     <add namespace="DevExpress.Web.ASPxTabControl" /> 
     <add namespace="DevExpress.Web.ASPxTreeView" /> 
     <add namespace="DevExpress.Web.ASPxUploadControl" /> 
     <add namespace="DevExpress.Web.ASPxHtmlEditor" /> 
     <add namespace="DevExpress.Web.ASPxSpellChecker" /> 
     <add namespace="DevExpress.XtraCharts"/> 
     <add namespace="DevExpress.XtraCharts.Web" /> 
     <add namespace="DevExpress.XtraReports" /> 
     <add namespace="DevExpress.XtraReports.UI" /> 
     <add namespace="DevExpress.XtraReports.Web" /> 
     <add namespace="DevExpress.Web.Mvc" /> 
     <add namespace="DevExpress.Web.Mvc.UI" /> 
     </namespaces> 
    </pages> 
    </system.web.webPages.razor> 

    <appSettings> 
    <add key="ClientValidationEnabled" value="true"/> 
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/> 
    <add key="DalManagerType" value="TimeTracker.DalEF.DalManager,TimeTracker.DalEF"/> 
    <add key="DalManagerTypeFMS" value="FMSv3.DALEF.DalManager,FMSv3.DALEF" /> 
    <add key="webpages:Enabled" value="false" /> 
    </appSettings> 

    <system.web> 
    <httpHandlers> 
     <add path="*" verb="*" type="System.Web.HttpNotFoundHandler"/> 
    </httpHandlers> 

    <!-- 
     Enabling request validation in view pages would cause validation to occur 
     after the input has already been processed by the controller. By default 
     MVC performs request validation before a controller processes the input. 
     To change this behavior apply the ValidateInputAttribute to a 
     controller or action. 
    --> 
    <pages 
     validateRequest="false" 
     pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" 
     pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" 
     userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
     <controls> 
     <add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" /> 
     </controls> 
    </pages> 
    </system.web> 

    <system.webServer> 
    <validation validateIntegratedModeConfiguration="false" /> 


    <handlers> 
     <remove name="BlockViewHandler"/> 
     <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" /> 
    </handlers> 
    </system.webServer> 
</configuration> 

Answer 1

案例1：

重组项目时，它的copy+paste错误。

解决方案：只是删除@inherits System.Web.Mvc.WebViewPage

案例2：

如果移动_ViewStart.cshtml从视图文件夹您对自己项目的根文件夹。

解决方案：_ViewStart.cshtml文件只能放置到Views文件夹中。 （在相同的水平web.config）

情况下3：

如果升级MVC3到4.5框架，并面临着这样的错误。

解决方案：只需添加@inherits System.Web.Mvc.ViewStartPage到_ViewStart.cshtml