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Could not load file or assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral,PublicKeyToken=31bf3856ad364e35'

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南方客
南方客 2020-12-09 02:34

In Visual Studio 2012 I created an ASP.NET MVC 4 project where the target framework is the .NET Framework 4.5. When I deployed my project to a web server it gave the followi

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  • 长发绾君心
    2020-12-09 03:06

    Try to reinstall Microsoft.AspNet.WebApi package. Open Package Manager Console and type:

    Update-Package Microsoft.AspNet.WebApi -reinstall

    Be careful, this command will remove all dependencies and you will have to install them manually.

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  • 南笙
    2020-12-09 03:08

    I know this is answered but I thought I'd add something.

    Every time I set "copy local" to true on a file causing the error I'd publish it and just get another one. So I just selected all of the files under references and set them all to true. This fixed the issue for me.

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  • 眼角桃花
    2020-12-09 03:13

    Check the bin folder of your deployed project. It should contain System.Web.Http.WebHost.dll. If this dll is in this folder, check it version. If it isn't 4.0.0.0, then you should deploy version 4.0.0.0 or change your web config to use other version (not really good idea because of dependencies)

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  • 闹比i
    2020-12-09 03:16

    I ran into this today after setting up a new Team City Build Agent. The new agent didn't have MVC 4 installed, perhaps part of the problem. Fortunately, I found this article which lead me to the solution. In Team City, I just updated the Build Step for the Nuget Restore so that it doesn't use the local cache.

    enter image description here

    This works because the cache may have been established by build runners with different (MVC) frameworks installed already.

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  • 情深已故
    2020-12-09 03:21

    I had the same issue today during deployment. I was able to fix it by marking the assembly to be copied to the deployment file.

    In order to do this, in my Visual Studio project, select the System.Web.Http.Webhost assembly in your references and alter the 'Copy Local' property to True. I had to repeat this for a few other assemblies that were missing.

    Thanks to this website for the tips - http://haacked.com/archive/2008/11/03/bin-deploy-aspnetmvc.aspx/

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  • 梦如初夏
    2020-12-09 03:23

    Ensure ASP.NET MVC 4 is installed on your server. Check it in the following location -

    C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4

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