Using C# 6 features with CodeDomProvider (Roslyn)

Question

CodeDomProvider objCodeCompiler = CodeDomProvider.CreateProvider( "CSharp" );

CompilerParameters objCompilerParameters = new CompilerParameters();

...

CompilerResults objCompileResults = objCodeCompiler.CompileAssemblyFromFile( objCompilerParameters, files.ToArray() );

When I compile my files I get:

FileFunctions.cs(347): Error: Unexpected character '$'

Does anyone know how to get string interpolation working with CodeDom compiling?

I found this link: How to target .net 4.5 with CSharpCodeProvider?

So I tried:

     var providerOptions = new Dictionary<string, string>();
     providerOptions.Add( "CompilerVersion", "v4.0" );

     // Instantiate the compiler.
     CodeDomProvider objCodeCompiler = CodeDomProvider.CreateProvider( "CSharp", providerOptions );

But I still get the same error.

I also updated the target framework to .NET Framework 4.6.

NOTE: I can't specify "v4.5" or "v4.6" or I will get:

************** Exception Text **************
System.InvalidOperationException: Compiler executable file csc.exe cannot be found.
   at System.CodeDom.Compiler.RedistVersionInfo.GetCompilerPath(IDictionary`2 provOptions, String compilerExecutable)
   at Microsoft.CSharp.CSharpCodeGenerator.FromFileBatch(CompilerParameters options, String[] fileNames)
   at Microsoft.CSharp.CSharpCodeGenerator.System.CodeDom.Compiler.ICodeCompiler.CompileAssemblyFromFileBatch(CompilerParameters options, String[] fileNames)
   at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromFile(CompilerParameters options, String[] fileNames)
   at Dynamic.CodeDOMCompiler.CompileAllCodeFiles() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\Core\CodeDOMCompiler.cs:line 93
   at NewForm.InitializeSystem() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 179
   at NewForm.NewForm_Load(Object sender, EventArgs e) in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 111
   at System.Windows.Forms.Form.OnLoad(EventArgs e)

I have tried using the suggestion by Thomas Levesque:

CodeDomProvider objCodeCompiler = new Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider();

But then I get:

************** Exception Text **************
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\bin\x86\Debug\bin\roslyn\csc.exe'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Compiler.get_CompilerName()
   at Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Compiler.FromFileBatch(CompilerParameters options, String[] fileNames)
   at Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Compiler.CompileAssemblyFromFileBatch(CompilerParameters options, String[] fileNames)
   at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromFile(CompilerParameters options, String[] fileNames)
   at Dynamic.CodeDOMCompiler.CompileAllCodeFiles() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\Core\CodeDOMCompiler.cs:line 87
   at NewForm.InitializeSystem() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 179
   at NewForm.NewForm_Load(Object sender, EventArgs e) in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 111
   at System.Windows.Forms.Form.OnLoad(EventArgs e)

I'm not sure why it is trying to look for "csc.exe" in a subfolder of my bin directory.

This path exists:

C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\bin\x86\Debug\roslyn

But it was looking for:

C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\bin\x86\Debug\bin\roslyn\csc.exe

Answer 1

The built-in CodeDOM provider doesn't support C# 6. Use this one instead:

https://www.nuget.org/packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/

It's based on Roslyn and supports the C# 6 features.

Just change this line:

CodeDomProvider objCodeCompiler = CodeDomProvider.CreateProvider( "CSharp" );

to this:

CodeDomProvider objCodeCompiler = new Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider();