但View视图中相关的很多代码都报错，比如:

1.@model找不到

2.@Html找不到，本该是System.Web.MVC的HtmlHelper,系统却将其认成是

System.Web.WebPages.HTML.HtmlHelper

参考地址 http://stackoverflow.com/questions/4605263/viewbag-title-error

解决方法及原因：System.Core冲突，直接将3.5版本的System.Core删掉，只保留4.0的即可

I solved it in the following way:

First i noticed using gacutil (Global Assembly Cache Utility) that it contained two references to System.Core, one to version 4.0 and one to version 3.5. Apparently inside the razor views, even if in the project i had the correct reference to version 4.0, it was still using version 3.5 and that's why i was getting the error about the dynamic types. To check if that's your case open as administrator Visual Studio Command Prompt and execute:

gacutil -l System.Core

To remove the reference to the old version of System.Core i did the following steps:

- cd %systemroot%\assembly\

From here you may have more that one "gac" directory, so you will have to search within each to find your component. For me, it was within the "gac_MSIL" directory.

- cd gac_msil

还有救是System.Web.Mvc 这个文件复制到本地

ViewBag 出现 找不到编译动态表达式所需的一种或多种类型。是否缺少引用?

需要引用 Microsoft.CSharp