Could not load file or assembly Microsoft.Win32.Primitives, Version=4.0.0.0

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I am having problems running my web application.

The project setup is ASP.NET Core web application (.NET Framework). I don't seem to get any Build error. The project doesn't just run.

System.IO.FileLoadException: 'Could not load file or assembly 'Microsoft.Win32.Primitives, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)'

enter image description here

c#
visual-studio
web
.net-assembly
fileloadexception
asked on Stack Overflow Feb 18, 2017 by Cody • edited Mar 8, 2017 by Emond Erno

5 Answers

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Try adding the System.Net.Http nuget package.

answered on Stack Overflow Apr 25, 2017 by tjrobinson
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In other for me to get it working i uninstalled the Microsoft.Win32.Primitives then installed the exact version which is 4.0. this worked fir me.

Note that there are higher versions but they did not work for me.

answered on Stack Overflow Feb 18, 2017 by Cody
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This happened to me after I had updated to Visual Studio 2017 15.4.5 and also updated a load of Nuget packages. I think part of the problem is also using .net framework 4.7.1 as well, which I installed last week...

The fix for me was to remove the dependent assembly from web.config, so just comment out or delete this section:

<dependentAssembly>
    <assemblyIdentity name="Microsoft.Win32.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.0.1.0" newVersion="4.0.1.0" />
</dependentAssembly>
answered on Stack Overflow Nov 30, 2017 by Liam
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I accidently deleted my *.suo files and the problem fixed itself. Maybe it was an accident, or irrelevant but i just thought to share it.

answered on Stack Overflow Apr 29, 2018 by pantelis mpogiatzis
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If you are targeting .Net 4.7.1 project, I contend that a 4.7.1 versioned Primitives DLL is not available. Take a look at the properties in Nugetenter image description here

I believe the Nuget expression would need a > not a = 4.6.

This feels like a hack, but it seemed to work. If you open Web.config, change this to 4.6enter image description here

answered on Stack Overflow Aug 20, 2018 by LargeDachshund • edited Aug 20, 2018 by LargeDachshund

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