Could not load file or assembly Microsoft.CodeAnalysis

36

I have a webproject I am trying to host, but when the server tries to compile it, I get the following error:

Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly 'Microsoft.CodeAnalysis, Version=1.1.0.0, 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) ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.CodeAnalysis, Version=1.0.0.0, 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)
--- End of inner exception stack trace --- at Microsoft.CodeAnalysis.CSharp.CommandLine.Program.Main(String[] args)

So the server has an older version of CodeAnalysis than my project. So lets try a binding redirect!

<dependentAssembly>
    <assemblyIdentity name="Microsoft.CodeAnalysis" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-9.9.9.9" newVersion="1.0.0.0" />
</dependentAssembly>

Sadly, I still get the same error. What am I doing wrong?

c#
visual-studio
asked on Stack Overflow Mar 4, 2016 by yesman • edited Dec 2, 2016 by yesman

6 Answers

40

I figured this out myself. To anyone reading this, the problem was that the Nuget package Microsoft.CodeDom.Providers.DotNetCompilerPlatform (which also contains the CodeAnalysis package) was the wrong version. I created a new webproject, updated the offending Nuget package right away, and the problem was solved.

answered on Stack Overflow Apr 5, 2016 by yesman
4

I resolved this issue but ensuring that the version numbers of the assemblies in my web.config were correct.

Edit:

I hit this problem as well and some may wonder how the Web.Config can become incorrect. In my case I am using Web.Config Transforms so the Web.Config file gets overwritten: enter image description here

Changing the version number in Web.Configs compiler (in the Web.Template.Config) to the number matches the NuGet version does solve the issue:

<compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.5.0
answered on Stack Overflow Jan 16, 2017 by Mark • edited Jun 9, 2017 by Jeremy Thompson
4

Other possible fix (at least for Visual Studio 2015):

Get the latest Visual Studio update.

You can check for updates by going to Tools/Extensions and Updates/Updates

Same as this Q/A: Visual Studio 2015: Quick Actions no longer working, error: Could not load file or assembly Microsoft.CodeAnalysis

answered on Stack Overflow Mar 28, 2017 by Don Cheadle • edited May 23, 2017 by Community
1

I have had this problem today while doing an Umbraco v7.13.0 upgrade, simply updating the following package has fixed my problem, this is apparently a common problem with things like Umbraco upgrades.

Update-Package -Reinstall Microsoft.CodeAnalysis.CSharp
answered on Stack Overflow Jan 11, 2019 by Nurhak Kaya
0

If none of mentioned options work, please go for this answer. Basically, you are registering that Microsoft.CodeAnalysis.dll to GAC

Could not load file or assembly 'Microsoft.CodeAnalysis, version= 1.3.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependenc

answered on Stack Overflow May 24, 2017 by Dhrumil Bhankhar
-1

Right click on your project >> Manage Nuget packages manager for solution >> Tap on Updates >> Update your 'Microsoft.CodeDom.Providers.DotNetCompilerPlatform' >> and then run your project again.

answered on Stack Overflow Dec 15, 2018 by Sujeet Kumar Yadav • edited Dec 15, 2018 by Klaus G├╝tter

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