Could not load file or assembly 'Microsoft.CodeAnalysis

[Nilotaviano]

I'm trying to use this lib to generate HTML on an Azure Function, not sure what could be going wrong here.

public static string RenderViewToString(RedactedViewModel model)
{
    const string templateName = "redacted";
    string viewPath = Path.Combine(Constants.VIEW_FOLDER_PATH, templateName + ".cshtml");

    return new RazorEngine()
        .Compile(File.ReadAllText(viewPath))
        .Run(model);
}

System.IO.FileNotFoundException
HResult=0x80070002
Message=Could not load file or assembly 'Microsoft.CodeAnalysis, Version=3.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. The system cannot find the file specified.
Source=RazorEngineCore
StackTrace:
at RazorEngineCore.RazorEngineCompilationOptions..ctor()
at RazorEngineCore.RazorEngineCompilationOptionsBuilder..ctor(RazorEngineCompilationOptions options)

[Nilotaviano]

Even running your Basic Usage example gives the same error

public static string RenderViewToString(DailyTicketReportViewModel model)
{
    IRazorEngine razorEngine = new RazorEngine();
    IRazorEngineCompiledTemplate template = razorEngine.Compile("Hello @Model.Name");

    string result = template.Run(new
    {
        Name = "Alexander"
    });

    return result;
}

[adoconnection]

It is something to do with framework version, are you running function against net core 3?
@AndyMDoyle may bring some light.

[AndyMDoyle]

@Nilotaviano, I ran in to the same issue a few weeks ago and it drove me crazy trying to find the problem.

It turns out there's a known issue with Azure Functions where assemblies are cleaned up during build and this currently results in some assemblies being removed by mistake if you have installed a newer version of an assembly than expected.

To work around the issue, add the following to your csproj file to prevent the cleanup:

  <PropertyGroup>
    <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>
  </PropertyGroup>

The Azure Functions team are aware of this and are working on fixing it. You can follow along on the issue at Azure/azure-functions-host#5894

[Nilotaviano]

Thanks @AndyMDoyle, that works.

[rochapablo]

@AndyMDoyle thank you so much! You just save the day.