Why Can't I Find 'bin\roslyn\csc.exe' When Running My ASP.NET MVC Project?

"Could Not Find a Part of the Path ... binroslyncsc.exe" in ASP.NET MVC Project

When attempting to run an ASP.NET MVC project, developers may encounter the perplexing error "Could not find a part of the path ... binroslyncsc.exe". This issue can be particularly frustrating for those who haven't explicitly integrated Roslyn into their project. In this context, we delve into the cause of this error and provide a solution to resolve it.

Understanding Roslyn and Its Role

Roslyn, a .NET compiler platform, serves as a powerful tool for compiling code. However, in the described scenario, the project's build process is unexpectedly referencing binroslyncsc.exe, despite Roslyn not being explicitly configured or intended for use.

Resolving the Error

To rectify this issue, developers are recommended to execute the following command in the Package Manager Console:

Update-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -r

This command attempts to update the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package, which includes Roslyn.

Further Investigation into the Cause

The root cause of this error lies not within Visual Studio itself but rather in a bug that exists in certain versions of the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package. Upgrading to a version not affected by this bug resolves the issue.

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