blocks|key|26528|text|放置在App_Code文件夹中的代码被视为有点不同，它是在运行时编译的。cshtml文件是“内容”的，所以这可能是你得到错误的原因。在项目中创建normal文件夹，将其命名为Code或类似的名称(但不是App_Code)，并将文件放在其中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|26529|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Code placed in App_Code folder is treated a bit different, it is compiled at runtime. cshtml file is 'Content' so that could be the reason why you get errors. Create normal folder within your project name it Code or something similar (but not App_Code) and place your file there.

blocks|key|4534057|text|我也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4534058|我手动编辑了生成的文件file.cshtml.72cecc2a.cs+(位于AppData\Local\Temp\Temporary+ASP.NET+Files\root)，并将ASP.global_asax更改为System.Web.HttpApplication，然后错误就消失了。|offset|length|style|CODE|4534059|以下是生成的代码：|4534060|protected+static+ASP.global_asax+ApplicationInstance+{
++++get+{
++++++++return+((ASP.global_asax)(Context.ApplicationInstance));
++++}
}|code-block|syntax|javascript|4534061|我将其更改为：|4534062|protected+static+System.Web.HttpApplication+ApplicationInstance+{
++++get+{
++++++++return+((System.Web.HttpApplication)(Context.ApplicationInstance));
++++}
}|4534063|我不知道为什么会发生这样的事情。|4534064|entityMap^0|0|B|N|12|1B|2H|F|2Z|Q|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|19|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|1A|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|V|$]]

I had the same issue. 

I manually edited the generated file <code>file.cshtml.72cecc2a.cs</code> (it was at <code>AppData\Local\Temp\Temporary ASP.NET Files\root</code>) and changed <code>ASP.global_asax</code> to <code>System.Web.HttpApplication</code> and the error went away.

This is the generated code:

<pre><code>protected static ASP.global_asax ApplicationInstance {
 get {
 return ((ASP.global_asax)(Context.ApplicationInstance));
 }
}
</code></pre>

I changed it to:

<pre><code>protected static System.Web.HttpApplication ApplicationInstance {
 get {
 return ((System.Web.HttpApplication)(Context.ApplicationInstance));
 }
}
</code></pre>

I don't know why this is happening though.

blocks|key|4534135|text|我做了两件事来解决这个问题，那就是重新确定框架的目标，然后将其改回(使用4.5.1将其改为4.5，然后再改回)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4534136|在此之后，我也在使用T4MVC时遇到了很多错误，我将其升级到最新版本，但我可以看到在源代码控制中，T4MVC是针对框架4.5安装的，当您重新安装新的nuget包时，它会更改目标框架，因此更改为4.5.1|4534137|在这之后，一切都正常了。我没有测试你是否只需要做这个答案的第二部分，但我会先试一试。|4534138|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Two things i did to resolve this was to re-target the framework and then changing it back (was using 4.5.1 changed it to 4.5 and back)

After this i had a lot of error with T4MVC which i was also using, i upgraded it to newest version but i could see that in source control that T4MVC was installed targeting framework 4.5 and when you re/install a new nuget package it changes the target framework, so that was changed to 4.5.1

After this everything worked. I didn't test if you only need to do that second part of this answer, but i would try that first.

blocks|key|4534180|text|我解决这个错误的方法是将我的代码从Global.asax.cs移到Startup.cs中，并删除Global.asax，这样我的项目中就没有任何代码隐藏文件了。有关详细信息，请参阅this+question。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4534181|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/20168978/do-i-need-a-global-asax-cs-file-at-all-if-im-using-an-owin-startup-cs-class-and^0|2I|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The way I resolved this error was to move my code form Global.asax.cs into Startup.cs and delete Global.asax so that there aren't any codebehind files in my project. See <a href="https://stackoverflow.com/questions/20168978/do-i-need-a-global-asax-cs-file-at-all-if-im-using-an-owin-startup-cs-class-and">this question</a> for more info.

blocks|key|26695|text|我为我的web项目安装了Microsoft.CodeDom.Providers.DotNetCompilerPlatform，然后删除了该软件包。错误消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|26696|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I installed Microsoft.CodeDom.Providers.DotNetCompilerPlatform for my web project and then removed the package. The error went away.

blocks|key|4534232|text|我发现，如果我在Visual+Studio2015中打开了App_Code中的文件，当我运行构建时，我就不会得到错误。当我关闭这些文件时，错误再次出现。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4534233|entityMap^0|T|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I've found that if I have the files in <code>App_Code</code> open in Visual Studio 2015 when I run the build, then I don't get the errors. As soon as I close the files the errors show up again.

blocks|key|26785|text|在尝试了这里提出的各种解决方案后，事实证明，只需退出Visual+Studio+2015，然后重新启动它，就足以让解决方案/项目再次成功编译。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|26786|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

After trying a variety of the solutions proposed here, it turns out that simply quitting Visual Studio 2015 and then restarting it was enough to get the Solution/Project to successfully compile once again.

blocks|key|26802|text|只需右键单击您的解决方案项目，然后单击CLEAN。我已经做到了这对我来说很管用。我之所以分享这篇文章，是因为谁知道它是否帮助了其他人，比如它是否帮助了我。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|26803|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

JUST RIGHT CLICK ON YOUR SOLUTION PROJECT AND CLICK ON CLEAN. I HAVE DONE THAT AND IT DID WORK FOR ME. I AM SHARING THIS BECAUSE WHO KNOWS IF IT HELPS SOMEONE ELSE LIKE IT HELPS ME.

I created a RazorFunctions.cshtml file on App_Code

<pre><code>@functions {
 public static string GetActiveClassIf(string controllerName, string actionName = null)
 {
 var routeData = @HttpContext.Current.Request.RequestContext.RouteData;
 string currentController = routeData.Values["controller"].ToString();
 string currentAction = routeData.Values["action"].ToString();
 return controllerName == currentController &amp;&amp;
 (String.IsNullOrEmpty(actionName) || currentAction == actionName) ? "active" : "";
 }
}
</code></pre>

and when I compile, it give me 2 errors (compilation get success and site work without problem) but the errors are annoying.

The RazorFunctions.cshtml are as Content (tried compile but doesn't work with cshtml files of course)

Global.asax.cs is :

<pre><code>public class MvcApplication : System.Web.HttpApplication
{
 protected void Application_Start()
 {
 AreaRegistration.RegisterAllAreas();
 ModelMetadataConfig.RegisterModelMetadata();
 FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
 RouteConfig.RegisterRoutes(RouteTable.Routes);
 BundleConfig.RegisterBundles(BundleTable.Bundles);
 Database.SetInitializer(new MigrateDatabaseToLatestVersion&lt;ApplicationDbContext, Configuration&gt;());
 //Database.SetInitializer(new DropCreateDatabaseAlways&lt;ApplicationDbContext&gt;());
 }
}
</code></pre>

and

<pre><code>&lt;%@ Application Codebehind="Global.asax.cs" Inherits="Bouron.Web.MvcApplication" Language="C#" %&gt;
</code></pre>

This is the first time I use the App_Code so I don't know what else to do, all search returns ASP.NET 1-2 results, are out of date where razor doesn't even exist so I'm not sure how can I solve this.

I'm using Visual Studio 2015 (just in case it matters)

"ASP.global_asax does not exist in the namespace ASP"

Visual Studio

我在App_Code上创建了一个RazorFunctions.cshtml文件@functions {    public static string GetActiveClassIf(string controllerName, string actionName = null)    {        var ro...

问"ASP.global_asax在命名空间ASP中不存在“
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