[asp.net-mvc-4] Could not load file or assembly System.Net.Http, Version=4.0.0.0 with ASP.NET (MVC 4) Web API OData Prerelease


6 Answers

I made it work by upgrading the WebApi package to the prerelease version using nuget:

PM> Microsoft.AspNet.WebApi -Pre

In order to force the project using the latest version of WebApi, some modifications to the root Web.config were necessary:

1) Webpages Version from 2.0.0.0 to 3.0.0.0

<appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
</appSettings>

2) Binding redirect to 5.0.0.0 for System.Web.Http and System.Net.Http.Formatting

<dependentAssembly>
    <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>
<dependentAssembly>
    <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>

I think that's it

PS: Solution highly inspired from WebAPI OData 5.0 Beta - Accessing GlobalConfiguration throws Security Error

Question

Problem

After installing the Microsoft ASP.NET Web API OData package 5.0.0-rc1 prerelease I end up with the following exception:

Could not load file or assembly 'System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

My MVC 4 project is brand new and really small, nothing fancy in it. I target .NET framework 4.5

I need this nuget package to implement PATCH using the Delta class (When I use the version 4.0.0.0 of the package, the Delta class is not working).

How can I fix that?

My versions of System.Web.Http

In GAC I have version 5.0.0.0 of System.Web.Http

gacutil -l System.Web.Http The Global Assembly Cache contains the following assemblies: System.Web.Http, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL

In Visual Studio, when I browse assemblies, the given version of System.Web.Http is 4.0.0.0 (Why?)

In my project, the reference to System.Web.Http

  • Has the version 5.0.0.0
  • Points to the \lib\net45\ folder of the package
  • Has CopyLocal=true

Things I tried

I tried to bind redirect v 4.0.0.0 to 5.0.0.0 in Web.config

<dependentAssembly>
    <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="4.0.0.0-4.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>

But it gives me another exception:

Attempt by method 'System.Web.Http.GlobalConfiguration..cctor()' to access field 'System.Web.Http.GlobalConfiguration.CS$<>9__CachedAnonymousMethodDelegate2' failed.

I guess that v 4.0.0.0 really need to be used by core Web Api engine.

Linked questions

Code Analysis error Could not load file or assembly 'System.Net.Http, Version=2.0.0.0 in MVC4 Web API Could not load file or assembly 'System.Net.Http, Version=2.0.0.0 in MVC4 Web API




Went into nuget package manager and updated my packages. Now it works. The main one I updated was the Microsoft.AspNet.WebApi.Core. May need to do this with both projects to sync up the proper references.




I have faced same type of issue and followed the below steps to resolved the issue

Go to Tools --> Library Package Manager --> Package Manager Console and run the below command

Install-Package Microsoft.ASPNet.WebAPI -pre




I faced the same error. When I installed Unity Framework for Dependency Injection the new references of the Http and HttpFormatter has been added in my configuration. So here are the steps I followed.

I ran following command on nuGet Package Manager Console: PM> Install-Package Microsoft.ASPNet.WebAPI -pre

And added physical reference to the dll with version 5.0




This should work, I had the same problem and did this to fix it:

I made a screenshot from the official MSDN site as I didn't had the time to write a proper answer.




Remove System.Web.Http and System.Net.Http.Formatting from your references and Add references back in by browsing to your bin folder (where they were copied to by nuget) Now the file version says 5.0.0.0




I experienced this issue when I tried to update a Hot Towel Project from the project template and when I created an empty project and installed HotTowel via nuget in VS 2012 as of 10/23/2013.

To fix, I updated via Nuget the Web Api Web Host and Web API packages to 5.0, the current version in NuGet at the moment (10/23/2013).

I then added the binding directs:

<dependentAssembly>
  <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>
<dependentAssembly>
  <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>





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