无法加载文件或程序集 Microsoft.CodeAnalysis

Question

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?

Answer 1

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.

Answer 2

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:

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

Answer 3

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

Answer 4

我今天在进行 Umbraco v7.13.0 升级时遇到了这个问题，只需更新以下软件包即可解决我的问题，这显然是Umbraco upgrades 之类的常见问题。

Update-Package -Reinstall Microsoft.CodeAnalysis.CSharp

Answer 5

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

Answer 6

右键单击您的项目 >> 管理解决方案的 Nuget 包管理器 >> 点击更新 >> 更新您的“Microsoft.CodeDom.Providers.DotNetCompilerPlatform” >> 然后再次运行您的项目。