Where can I find a NuGet package for upgrading to System.Web.Http v5.0.0.0?

126
votes

Just upgraded an ASP.NET MVC4 project to use Unity.WebApi version 5.0.0.0 and it requires System.Web.Http v 5.0.0.0 as per the following error:

Assembly 'Unity.WebApi, Version=5.1.0.0, Culture=neutral, PublicKeyToken=43da31bc42a85347' uses 'System.Web.Http, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher version than referenced assembly 'System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

I am currently referencing System.Web.Http v4.0 but have the following NuGet packages upgraded to their respective latest versions:

  • ANTLRv3

  • Microsoft ASP.NET Universal Providers

  • Microsoft.Web.Infrastructure

  • Microsoft ASP.NET MVC

  • Microsoft ASP.NET Razor

  • Microsoft ASP.NET Universal Providers Core Libraries

  • Microsoft ASP.NET Universal Providers

  • Microsoft ASP.NET Web API 2 Client

  • Microsoft ASP.NET Web API 2 Core

  • Microsoft ASP.NET Web API 2 Web Host

  • Microsoft ASP.NET Web API 2

  • Microsoft ASP.NET Web Page

  • Microsoft.Web.Infrastructure

  • WebGrease

    via NuGet. I have not listed relevant JavaScript libraries such as Micrososft.jQuery.Unobtrusive Validation, etc.

What is the NuGet package to upgrade System.Web.Http or do I have to do this manually?

2
c#.netasp.net-mvc-4nugetasp.net-web-api2
If you select "Include Prerelease" instead of "Stable" in the NuGet Package Manager, you'll see System.Web.Http. Is that what you're looking for? – William
am I supposed to be searching for System.Web.Http after selecting "Include Prerelease"? Or where should I be looking? – Klaus Nji
Disregard my above comment! That package is outdated. You should try to follow Stjin's suggestion below. Strangely enough, when I install Unity.WebApi in my MVC 4 project, it updates the System.Web.Http reference to v5.0 automatically, so I'm not sure why it isn't working for you. If all else fails, you could try uninstalling the Unity package and reinstalling it. – William

2 Answers

211
votes

You need the Microsoft.AspNet.WebApi.Core package.

You can see it in the .csproj file:

<Reference Include="System.Web.Http, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
  <SpecificVersion>False</SpecificVersion>
  <HintPath>..\packages\Microsoft.AspNet.WebApi.Core.5.0.0\lib\net45\System.Web.Http.dll</HintPath>
</Reference>
10
votes

I have several projects in a solution. For some of the projects, I previously added the references manually. When I used NuGet to update the WebAPI package, those references were not updated automatically.

I found out that I can either manually update those reference so they point to the v5 DLL inside the Packages folder of my solution or do the following.

  1. Go to the "Manage NuGet Packages"
  2. Select the Installed Package "Microsoft ASP.NET Web API 2.1"
  3. Click Manage and check the projects that I manually added before.