How to Fix the 'Could not find ...\bin\roslyn\csc.exe' Error in ASP.NET MVC?

Resolving the "Could not find ...binroslyncsc.exe" Error in ASP.NET MVC

Encountering the elusive "Could not find a part of the path ... binroslyncsc.exe" error in your ASP.NET MVC project can be perplexing, especially when it occurs after a seamless build and compilation. While the involvement of the Roslyn .NET compiler platform may initially raise questions, a solution lies within the depths of NuGet package management.

The NuGet Connection

The aforementioned error stems from a flaw within certain versions of the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package. To address this, it's essential to perform an update-upgrade of the package via the Package Manager Console:

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

Beyond the Build Process

Unlike conventional solutions involving manual file copying or addition of compiler binaries, this fix tackles the root cause by installing a bug-free version of the package. In essence, it rectifies the package dependency issue that triggers the "csc.exe" path not being found.

Project Health Check

After updating the NuGet package, it's prudent to inspect your .csproj file. Verify that the paths to the packages are accurate within the tags near the top and the with the name "EnsureNuGetPackageBuildImports" towards the bottom. This process ensures that your project aligns with the appropriate package dependencies.

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