Autofac error: Could not load file or assembly 'System.Web.Http, Version=5.2.0.0,...' My project is Owin WebApi2 SelfHost

Question

I have a simple project which uses Microsoft.AspNet.WebApi.OwinSelfHost. It is a Owin self hosted WebApi 2 project.The project is pretty much similar to:-

https://github.com/attilah/AngularJSAuthentication

The only difference I have is my Security module is in separate Assembly (everything similar to above project). I use Autofac to resolve my dependencies.

This project worked when there's no Autofac. But once I am trying to setup my project with the corresponding security modules and Autofac all I am facing is this error:-

Could not load file or assembly 'System.Web.Http, Version=5.2.0.0, 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 configuration is very much inspired from this thread:-

Dependency injection not working with Owin self-hosted Web Api 2 and Autofac

Moreover, I found someone else struggled with this dependency bug of Autofac and was able to get similar issue resolved by re-installing Microsoft.AspNet.WebApi.WebHost:

GlobalConfiguration.Configure() not present after Web API 2 and .NET 4.5.1 migration

But this doesn't work for me I don't know why. I've tried re-installing everything from scratch also doesn't help. Besides the fact that Autofac has several permission issues while re-installing as well.

Anybody has any experience with this error? please help. Thanks!

score 29 · Accepted Answer · edited May 23 '17 at 12:24

29

I managed to fix this dependency issue with help from comment by @user998660 in above thread.

What I did is:

I right clicked the assembly System.Web.Http in my Project's references.
I noticed that the version of assembly referenced by my project is 5.2.3.0
From the error above I know that Autofac is trying to reference System.Web.Http version 5.2.0.0. I needed a means to tell my app to use the newer version 5.2.3.0 instead of 5.2.0.0.

This is what I needed to add to my Web.config's <assemblyBinding> section:

  <dependentAssembly>
    <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="0.0.0.0-5.2.0.0" newVersion="5.2.3.0" />
  </dependentAssembly>

edited May 23 '17 at 12:24

Community

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answered Mar 05 '15 at 12:48

amitthk

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I can confirm that fixed the issue for me too – superlogical Aug 18 '15 at 21:55
this helped me as well. you should have marked this as answer. – jerbersoft Sep 25 '15 at 18:15
All I had to do was update the `` element to what @amitthk posted. Thanks! – danyim Nov 09 '15 at 21:20
If you use Nuget Package Manager, it will fix it for you when installing the WebApi package again. – bigbearzhu Apr 05 '16 at 05:19

score 1 · Answer 2 · answered Apr 02 '15 at 08:28

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Open managed nuget packages for solution, and install the latest Microsoft Asp.net Web Api 2.2 and that solved my problem.

answered Apr 02 '15 at 08:28

gideonlouw

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score 0 · Answer 3 · answered Jan 21 '17 at 11:33

0

Some times, the .nuget restore could give an issue.. though after successful checkin, setting disableSourceControlIntegration to false in .nuget.config file, would resolve this issue. add key="disableSourceControlIntegration" value="false"

answered Jan 21 '17 at 11:33

HydTechie

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Autofac error: Could not load file or assembly 'System.Web.Http, Version=5.2.0.0,...' My project is Owin WebApi2 SelfHost

3 Answers3