Could not load file or assembly System Net Http Version 4 0 0 0 with ASP NET MVC 4 Web API OData Prerelease

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   lt dependentAssembly gt       lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  4 0 0 0-4 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt    But it gives me another exception      Attempt by method  System Web Http GlobalConfiguration  cctor    to   access field    System Web Http GlobalConfiguration CS  lt  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   39 System Net Http  Version 2 0 0 0 in MVC4 Web API Could not load file or assembly   39 System Net Http  Version 2 0 0 0 in MVC4 Web API

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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

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I made it work by upgrading the WebApi package to the prerelease version using nuget   PM gt  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   lt appSettings gt       lt add key  webpages Version  value  3 0 0 0    gt   lt  appSettings gt    2  Binding redirect to 5 0 0 0 for System Web Http and System Net Http Formatting   lt dependentAssembly gt       lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt   lt dependentAssembly gt       lt assemblyIdentity name  System Net Http Formatting  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt    I think that s it  PS  Solution highly inspired from WebAPI OData 5 0 Beta - Accessing GlobalConfiguration throws Security Error

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Visual Studio 2013 has a new feature to take care of this  When you build the app  you should see warnings about different versions of an assembly being referenced  Double click the warning to add assembly binding redirects to the web config   See http   msdn microsoft com en-us library 2fc472t2 aspx for more details   jeff eynon notes below that you need to have the web config checked out  if using TFS source control  to get VS to edit the file automatically  Thanks for the tip

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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

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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

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Or you could do this from NuGet Package Manager Console   Install-Package Microsoft AspNet WebApi -Version 5 0 0   And then you will be able to add the reference to System Web Http WebHost 5 0

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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

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i solve by way nuget  the first you install nuget  the second you use  illustration follow    third   Check to see if this is the latest version by looking at the  Version  property    The finaly   you check project have latest version again

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I met the same problem and I resolved it by setting CopyLocal to true for the following libs   System Web Http dll System Web Http WebHost dll System Net Http Formatting dll  I must to add that I use MVC4 and NET 4

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If this issue occurs  kindly check web config in below section   Below section gives the version of particular dll used  after checking this section in web config  open solution explorer and select reference from the project tree as shown   Solution Explorer- Reference  After expanding reference  find the dll which caused the error  Right click on the dll reference and check for version like shown in the image above   If both config dll version and referenced dll is different you would get this exception  Make sure both are of same version which would help

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After modifying the References in the Web config file as mentioned above  we resolved the references   I was facing similar issue   For us we have reference  Microsoft Data Edm dll and OData dll and other assemblies from Program Files   C  Program Files  x86  Microsoft WCF Data Services 5 0                            bin  NETFramework Microsoft Data Edm dll   and   C  Program Files  x86  Microsoft WCF Data Services 5 0                          bin  NETFramework Microsoft Data OData dll   and version was 5 6 4   Once I change the reference of both assemblies to C      Project packages Microsoft Data Edm 5 6 0   the issue was resolved

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This error popped up several times on several different projects   What I finally figured out is that when I would build  there was already a copy of the system web mvc binary assembly in my bin folder   To fix this  right-click on the assembly in the list of references and select  properties    Check to see if this is the latest version by looking at the  Version  property   If it is  switch  Copy Local  to true   This will make sure that the version referenced in your project is the version that will end up in your binaries folder    If you still get the error  try running nuGet to get the latest version  then try the aforementioned again   Good luck - this error is a pain

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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    lt dependentAssembly gt     lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt     lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt   lt dependentAssembly gt     lt assemblyIdentity name  System Net Http Formatting  publicKeyToken  31bf3856ad364e35  culture  neutral    gt     lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt

[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

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