How to compile class library with roslyn?

[koinas]

Hi all,
I am using roslyn pad project to explore features.
I see that script is compiled into dll. It is wrapped into private class "Program".
The dll can be executed running dotnet filename command.

I wan to ccontrol host application(one that compiles script) from the script.
So i want to get types from compiled assemble and invoke methods.
Currently i can't do that cause Program class is private and is not seen by Assembly.GetType() reflection.
How could i recompile script as a class library like visual studio do?
Thanks

[jmarolf]

If you want to know how to compile a given scenario all you need to do is get the commandline.

if you have the sdk installed, you can run these commands to create a new project and produce a log.

dotnet new classlib
dotnet build /bl

that will produce a msbuild.binlog file that you can upload to https://live.msbuildlog.com/

wait a bit for the viewer to load your log

search for "csc" to filter the results

clicking on that will give you the commanline that the compiler used to build the library.

this is the set of arguments that are passed to csc on my machine:

C:\Program Files\dotnet\dotnet.exe exec "C:\Program Files\dotnet\sdk\5.0.100-rc.1.20420.14\Roslyn\bincore\csc.dll" 
/noconfig
/unsafe- 
/checked- 
/nowarn:1701,1702,1701,1702 
/fullpaths 
/nostdlib+ 
/errorreport:prompt 
/warn:4 
/define:TRACE;DEBUG;NET;NET5_0;NETCOREAPP;NETCOREAPP3_1 
/highentropyva+ 
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/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Threading.Thread.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Threading.ThreadPool.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Threading.Timer.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Transactions.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Transactions.Local.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.ValueTuple.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Web.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Web.HttpUtility.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Windows.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.Linq.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.ReaderWriter.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.Serialization.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.XDocument.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.XmlDocument.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.XmlSerializer.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.XPath.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\System.Xml.XPath.XDocument.dll" 
/reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20417.14\ref\net5.0\WindowsBase.dll"
/debug+ 
/debug:portable 
/filealign:512 
/optimize- 
/out:obj\Debug\net5.0\tmp.dll 
/refout:obj\Debug\net5.0\ref\tmp.dll 
/target:library 
/warnaserror- 
/utf8output 
/deterministic+ 
/langversion:9.0 
/analyzerconfig:obj\Debug\net5.0\tmp.GeneratedMSBuildEditorConfig.editorconfig 
/analyzer:"C:\Program Files\dotnet\sdk\5.0.100-rc.1.20420.14\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\Microsoft.CodeAnalysis.CSharp.NetAnalyzers.dll" 
/analyzer:"C:\Program Files\dotnet\sdk\5.0.100-rc.1.20420.14\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\Microsoft.CodeAnalysis.NetAnalyzers.dll"
/warnaserror+:NU1605 
 Class1.cs 
 "obj\Debug\net5.0\.NETCoreApp,Version=v5.0.AssemblyAttributes.cs" 
 obj\Debug\net5.0\tmp.AssemblyInfo.cs 

All that you would then need to do is create a new CSharpCompilationOptions type that has the same options specified and pass it into the constructor for CSharpCompilation.