How to Fix the 'Could Not Find a Part of the Path...bin\roslyn\csc.exe' Error in ASP.NET MVC?

"Path Not Found Error: Troubleshooting 'Could Not Find a Part of the Path...binroslyncsc.exe'"

In the realm of ASP.NET MVC development, encountering the perplexing "Could not find a part of the path" error, specifically regarding "binroslyncsc.exe," can be a frustrating hurdle. While you may have encountered this issue during a project build or while attempting to run an application from TFS source control, the answer lies in understanding the role of Roslyn and resolving a dependency issue.

Understanding Roslyn: The .NET Compiler

Roslyn is a .NET compiler platform introduced by Microsoft, offering advanced compiling capabilities. However, its involvement in your project may seem unanticipated.

Resolving the Dependency Issue

The resolution to this issue lies in updating a NuGet package, specifically "Microsoft.CodeDom.Providers.DotNetCompilerPlatform." Here's how:

1. Open the Package Manager Console.

2. Enter the following command:

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

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3. After the update completes, rebuild and rerun your application.

Additional Insights

The error message suggests a path discrepancy, indicating that the compiler file is not being found in the expected location. It's crucial to ensure that the NuGet package has the correct file paths specified in your project file (.csproj). Additionally, you may have to manually include the Roslyn compiler binaries if they are not included in the NuGet package.

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