asp.net-mvc-4 - 无法加载文件或程序集 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral,PublicKeyToken=31bf3856ad364e35'

Question

在 Visual Studio 2012 中，我创建了一个 ASP.NET MVC 4 项目，其中目标框架是 .NET Framework 4.5。当我将项目部署到 Web 服务器时，出现以下错误:

    Could not load file or assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file 
specified.

Description: An unhandled exception occurred during the execution of the current web request.
 Please review the stack trace for more information about the error and where
it originated in the code. 

Exception Details: System.IO.FileNotFoundException: Could not load file or 
assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral,
 PublicKeyToken=31bf3856ad364e35' or one of its dependencies.
 The system cannot find the file specified.

Source Error: 


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34237

Answer 1

我今天在部署过程中遇到了同样的问题。我能够通过将程序集标记为复制到部署文件来修复它。

为此，在我的 Visual Studio 项目中，选择引用中的 System.Web.Http.Webhost 程序集，并将“复制本地”属性更改为 True。我必须对其他一些丢失的程序集重复此操作。

感谢本网站的提示 - http://haacked.com/archive/2008/11/03/bin-deploy-aspnetmvc.aspx/