Visual Studio 2017 bin\roslyn files locked during build

Question

I am running VS2017 version 26430.13 and every time I try to build a web project I get errors that access to the files in the bin\roslyn is denied. Over a period of about 5 minutes the files are unlocked and I can build but the 5 minute delay is unacceptable.

These are the files that stay locked:

• Microsoft.CodeAnalysis.CSharp.dll
• Microsoft.CodeAnalysis.dll
• Microsoft.CodeAnalysis.VisualBasic.dll
• Microsoft.DiaSymReader.Native.amd64.dll
• System.Collections.Immutable.dll
• System.Diagnostics.FileVersionInfo.dll
• System.IO.Compression.dll
• System.IO.FileSystem.dll
• System.IO.FileSystem.Primitives.dll
• System.Reflection.Metadata.dll
• System.Security.Cryptography.Algorithms.dl
• System.Security.Cryptography.Primitives.dl
• System.ValueTuple.dll
• VBCSCompiler.exe

Answer 1

UPDATE the Microsoft.CodeDom.Providers.DotNetCompilerPlatform package to V1.0.7

• Find Microsoft.CodeDom.Providers.DotNetCompilerPlatform from NuGet Uninstall Old version
  Install V1.0.7 or latest