@ViewBag在当前上下文中不存在

将名称空间添加到~/Views/Web.config(不是root Web.config).在我的~/Views/Web.config中，我有:

Add the namespace to ~/Views/Web.config(not root Web.config). In my ~/Views/Web.config I have: <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.Helpers"/> <add namespace="System.Web.Mvc"/> <add namespace="System.Web.Mvc.Ajax"/> <add namespace="System.Web.Mvc.Html"/> <add namespace="System.Web.Optimization"/> <add namespace="System.Web.Routing"/> <add namespace="System.Web.WebPages"/> </namespaces> </pages> </system.web.webPages.razor>

并在我的根目录Web.config:

我在线搜索，其中一个答案告诉我名称空间应该相同.我做了，但是我没有任何改变.

I searched online and one of the answers told me the namespaces should be the same. I did but nothing changes to me.

确保目标版本.我的目标框架是4.5.我的MVC版本是5.2.0.0.其实我不明白这个解决方案.我试图将框架版本更改为4.5.1，而Visual Studio告诉我，我的版本实际上是4.5.我想我的目标版本还可以....(实际上我不理解此解决方案)

Make sure the target version. My target framework is 4.5. My MVC version is 5.2.0.0. Actually I am not understand this solution. I tried to change the framework version to 4.5.1 and the visual studio told me my version is actually 4.5. I guess my target version is OK....(Actually I do not understand this solution)

将@using System.Web.Optimization添加到~/Views/Shared/_Layout.cshtml.这使事情发生了.我的@Scripts.Render现在可以，但是@ViewBag下方仍然有一条红线.

Add @using System.Web.Optimization to ~/Views/Shared/_Layout.cshtml. This made something happens. My @Scripts.Render is OK now but @ViewBag still has a red line under it.

删除ComponentModelCache并重新启动Visual Studio.我正在使用VS2015.我尝试了，没有任何反应.

Delete ComponentModelCache and restart Visual Studio. I am using VS 2015. I tried, nothing happens.

稍后，我将更精确地执行这些解决方案，但我只想知道是否还有其他我错过并值得尝试的解决方案.非常感谢您的帮助！

I will perform these solutions more precisely later but I just want to know if there are other solutions I missed and worth trying. Thank you so much for the help !!

经过几个小时的挖掘.我解决了我的问题.我的解决方案1 ​​只能删除红线，当我运行Localhost调试时，它给了我500错误.

After a few hours digging. I solved my issue. My solution 1 can only remove the RED LINEs and it gave me 500 error When I run Localhost debug.

解决方案1:我只是在下面的~/Views/Web.config代码中将版本从3.0.0.0更改为2.0.0.0:

Solution 1: I simply changed the version from 3.0.0.0 to 2.0.0.0 in below code of ~/Views/Web.config:

当我将所有版本都更改为2.0.0.0时，红线消失了，但出现500错误.这表示system.web.webPages.razor已正确加载到_Layout.cshtml.

When I changed all the versions to 2.0.0.0, the red lines went away but I have 500 error. Which means system.web.webPages.razor loaded to the _Layout.cshtml correctly.

据我了解，如果system.web.webPages.razor版本不正确，则不会加载以下我的~/Views/Web.config设置:

To my understanding, My below settings of ~/Views/Web.config did not load if the system.web.webPages.razor version is incorrect:

解决方案2:然后，我检查了根Web.config中的以下部分代码:

Solution 2: Then, I checked below part of code in root Web.config:

webpages:version是2.0.0.0.我将其更改为3.0.0.0以匹配~/Views/Web.config中的版本，重新启动Visual Studio，它可以正常工作.

the webpages:version is 2.0.0.0. I changed it to 3.0.0.0 to match the version in ~/Views/Web.config, restart visual studio, it worked without any issue.

此链接是帮助我的一个链接.

This link is the one helped me.