ASP.NET web.config: Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider added even though it already exists inside location-Element

[v-lijm]

<system.codedom> section will be added again with following steps:

1. Create an ASP.Net Web Application (.Net Framework) with 4.X versions of the Roslyn CodeDom package in Visual Studio Community 17.7.4
2. Put <system.codedom> into as like this:
3. After build the solution, <system.codedom> section is added again at the end.

[CZEMacLeod]

You can add the property <RoslynRegisterInConfig>false</RoslynRegisterInConfig> to your project file to block adding the compilers.