Could not load file or assembly System Net Http Version 4 0 0 0 Culture neutral PublicKeyToken b03f5f7f11d50a3a

Question

I ve copied my project to a clean Windows 10 machine with only Visual Studio 2015 Community and SQL Server 2016 Express installed  There are no other framework versions installed apart from those installed with Windows 10 and VS2015 or SQL Server   When I try to start the WebApi project I get the message      Could not load file or assembly  System Net Http  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a  or one of its dependencies  The system cannot find the file specified    The project s packages include    lt package id  Microsoft AspNet WebApi  version  5 2 3  targetFramework  net45    gt   lt package id  Microsoft AspNet WebApi Client  version  5 2 3  targetFramework  net45    gt   lt package id  Microsoft AspNet WebApi Core  version  5 2 3  targetFramework  net45    gt   lt package id  Microsoft AspNet WebApi Tracing  version  5 2 3  targetFramework  net45    gt   lt package id  Microsoft AspNet WebApi WebHost  version  5 2 3  targetFramework  net45    gt    After building the project with  NET Framework 4 6 1  System Net Http the file is not found in the bin folder   The file s path points to      C  Program Files  x86  Reference Assemblies Microsoft Framework NETFramework v4 6 1 System Net Http dll   The file s path of System Net Http Formatting points to      C  Development MyApp packages Microsoft AspNet WebApi Client 5 2 3 lib net45 System Net Http Formatting dll   Should the whole project target 4 5 1 or is there another way to reference the right assemblies

User · Answer

The only way that cleanly solved this issue for me (.NET 4.6.1) was to not only add a Nuget reference to System.Net.Http V4.3.4 for the project that actually used System.Net.Http, but also to the startup project (a test project in my case).

(Which is strange, because the correct System.Net.Http.dll existed in the bin directory of the test project and the .config assemblyBingings looked OK, too.)

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The above bind-redirect did not work for me so I commented out the reference to System Net Http in web config  Everything seems to work OK without it      lt system web gt       lt compilation debug  true  targetFramework  4 7 2  gt         lt assemblies gt           lt  -- lt add assembly  System Net Http  Version 4 2 0 0  Culture neutral  PublicKeyToken B03F5F7F11D50A3A    gt -- gt           lt add assembly  System ComponentModel Composition  Version 4 0 0 0  Culture neutral  PublicKeyToken B77A5C561934E089    gt         lt  assemblies gt       lt  compilation gt       lt customErrors mode  Off    gt       lt httpRuntime targetFramework  4 7 2    gt     lt  system web gt

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Was updating an old website using nuget  including  Net update and MVC update    I deleted the System Net HTTP reference in VS2017  it was to version 2 0 0 0  and re-added the reference  which then showed 4 2 0 0   I then updated a ton of  packages  using nuget and got the error message  then noticed something had reset the reference to 2 0 0 0  so I removed and re-added again and it works fine    bizarre

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If you have multiple projects in your solution  then right-click on the solution icon in Visual Studio and select  Manage NuGet Packages for Solution   then click on the fourth tab  Consolidate  to consolidate all your projects to the same version of the DLLs  This will give you a list of referenced assemblies to consolidate  Click on each item in the list  then click install in the tab that appears to the right

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Changing the binding information in my web config  or app config  - while a  quot hack quot  in my view  allows you to move forward with your project after a NuGet package update whacks your application and gives you the System Net Http error  Set oldVersion  quot 0 0 0 0-4 1 1 0 quot  and newVersion  quot 4 0 0 0 quot  as follows  lt dependentAssembly gt       lt assemblyIdentity name  quot System Net Http quot  publicKeyToken  quot b03f5f7f11d50a3a quot  culture  quot neutral quot    gt       lt bindingRedirect oldVersion  quot 0 0 0 0-4 1 1 0 quot  newVersion  quot 4 0 0 0 quot    gt   lt  dependentAssembly gt

User · Answer

Change following    lt bindingRedirect oldVersion  0 0 0 0-4 1 1 2  newVersion  4 1 1 2    gt    with the following    lt bindingRedirect oldVersion  0 0 0 0-4 1 1 2  newVersion  4 0 0 0    gt    in web config

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4 6 1-2 in VS2017 users may experience the unwanted replacement of their version of System Net Http by the one VS2017 or Msbuild 15 wants to use    We deleted this version here   C  Program Files  x86  Microsoft Visual Studio 2017 Professional MSBuild Microsoft Microsoft NET Build Extensions net461 lib System Net Http dll  and here   C  Program Files  x86  Microsoft Visual Studio 2017 BuildTools MSBuild Microsoft Microsoft NET Build Extensions net461 lib System Net Http dll  Then the project builds with the version we have referenced via NuGet

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You can fix this by upgrading your project to  NET Framework 4 7 2  This was answered by Alex Ghiondea - MSFT  Please go upvote him as he truly deserves it      This is documented as a known issue in  NET Framework 4 7 1       As a workaround you can add these targets to your project  They will   remove the DesignFacadesToFilter from the list of references passed to   SGEN  and add them back once SGEN is done    lt Target Name  RemoveDesignTimeFacadesBeforeSGen  BeforeTargets  GenerateSerializationAssemblies  gt     lt ItemGroup gt       lt DesignFacadesToFilter Include  System IO Compression ZipFile    gt       lt  FilterOutFromReferencePath Include     DesignTimeFacadeAssemblies Names- gt    OriginalIdentity              Condition     DesignFacadesToFilter          DesignTimeFacadeAssemblies Names   and    Identity            gt        lt ReferencePath Remove     FilterOutFromReferencePath     gt     lt  ItemGroup gt     lt Message Importance  normal  Text  Removing DesignTimeFacades from ReferencePath before running SGen     gt   lt  Target gt    lt Target Name  ReAddDesignTimeFacadesBeforeSGen  AfterTargets  GenerateSerializationAssemblies  gt     lt ItemGroup gt       lt ReferencePath Include     FilterOutFromReferencePath     gt     lt  ItemGroup gt     lt Message Importance  normal  Text  Adding back DesignTimeFacades from ReferencePath now that SGen has ran     gt   lt  Target gt        Another option  machine wide  is to add the following binding redirect   to sgen exe config    lt runtime gt     lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt       lt dependentAssembly gt         lt assemblyIdentity name  System IO Compression ZipFile  publicKeyToken  b77a5c561934e089  culture  neutral    gt         lt bindingRedirect oldVersion  0 0 0 0-4 2 0 0  newVersion  4 0 0 0    gt       lt  dependentAssembly gt     lt  assemblyBinding gt   lt  runtime gt  This will only work on machines with  NET Framework 4 7 1  installed  Once  NET Framework 4 7 2 is installed on that machine  this workaround should be removed

User · Answer

In one of my projects there was a nuget packages with higher version of System Net Http  and in my startup project there reference to System Net Http v 4 0 0   i just installed System Net Http nuget package in my startup project and the problem solved

User · Answer

Follow the following steps    Update visual studio to latest version  it matters  Remove all binding redirects from web config Add this to the  csproj file    lt PropertyGroup gt     lt AutoGenerateBindingRedirects gt true lt  AutoGenerateBindingRedirects gt     lt GenerateBindingRedirectsOutputType gt true lt  GenerateBindingRedirectsOutputType gt   lt  PropertyGroup gt   Build the project In the bin folder there should be a  WebAppName  dll config file It should have redirects in it  copy these to the web config Remove the above snipped from the  csproj file   It should work

User · Answer

For me  I added the nuget again and the problem was solved

User · Answer

I have same issue and only way how i am able to fix it is add bindingRedirect to app confing how wrote  tripletdad99   But if you have solution with more project is really suck update every project by hand  and also sometimes after update some nuget package you need to do it again   And it is reason why i wrote simple powershell script which if all app configs    param       string  SourceDirectory       string  Package       string  OldVersion       string  NewVersion    Write-Host  Start fixing app config in  sourceDirectory  Write-Host   Package set oldVersion to  OldVersion and newVersion  NewVersion  Write-Host  Search app config files     array  files   get-childitem  sourceDirectory -Include app config App config -Recurse   select -expand FullName foreach   file in  files        Write-Host  file      xml    xml  Get-Content  file       daNodes    xml configuration runtime assemblyBinding dependentAssembly     foreach  node in  daNodes                if  node assemblyIdentity name -eq  package                         updateNode    node bindingRedirect              updateNode oldVersion    OldVersion              updateNode newVersion   NewVersion             Write-Host  Fix                       xml Save  file     Write-Host  Done    Example how to use     scripts FixAppConfig ps1 -SourceDirectory  C  project-folder  -Package  System Net Http  -OldVersion  0 0 0 0-4 3 2 0  -NewVersion  4 0 0 0    Probably it is not perfect and also it will be better if somebody link it to pre-build task

User · Answer

This will work in  NET 4 7 2 with Visual Studio 2017  15 9 4      Remove web app config binding redirects Remove NuGet package for System Net Http Open  Add New Reference  and directly link to the new 4 2 0 0 build that ships with  NET 4 7 2

User · Answer

Check  net framework version  My original  net framework is older version  After I installed  net framework 4 6  this issue is automatically solved

User · Answer

I had this  but  it was because I had added a NuGet package that had updated the binding redirects  Once I removed the package  the redirects were still there  I removed all of them  and then ran update-package -reinstall  This added the correct redirects

User · Answer

For me  I had set my project to run on the latest version of  Net Framework  a change from  Net Framework 4 6 1 to 4 7 2    Everything worked  no errors and published without issue  and it was only by chance that I came across the System Net Http error message  shown in a small  hard-to-notice  but quite important API request over the website I m working on   I rolled back to 4 6 1 and everything is fine again

[c#] Could not load file or assembly "System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

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