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

Update: March 2018

Word of caution, NuGet version 1.0.6 ... 1.0.8 will not copy the /roslyn folder to the build output directory on non-web projects. Best stick with 1.0.5 https://github.com/aspnet/RoslynCodeDomProvider/issues/38

Run-time compilation using C#6 features requires a new compiler, as @thomas-levesque mentioned. This compiler can be installed by using the nuget package Microsoft.CodeDom.Providers.DotNetCompilerPlatform.

For desktop applications, there's a problem. The ASP.NET team, in their infinite wisdom have hard-coded the path to the compiler as <runtime-directory>\bin\roslyn\csc.exe See discussion at https://github.com/dotnet/roslyn/issues/9483

If your desktop application is compiled to \myapp\app.exe, the roslyn compiler will be located at \myapp\roslyn\csc.exe, BUT THE CSharpCodeProvider WILL RESOLVE csc.exe as \myapp\bin\roslyn\csc.exe

As far as I can tell, you have two options

1. Create a post-build and/or installation routine that will move the \roslyn subdirectory to \bin\roslyn.
2. Fix the runtime code through reflection black magic.

Here is #2, by exposing the CSharpCodeProvider as a property in a utility class.

using System.Reflection; using Microsoft.CodeDom.Providers.DotNetCompilerPlatform;  static Lazy<CSharpCodeProvider> CodeProvider { get; } = new Lazy<CSharpCodeProvider>(() => {     var csc = new CSharpCodeProvider();     var settings = csc         .GetType()         .GetField("_compilerSettings", BindingFlags.Instance | BindingFlags.NonPublic)         .GetValue(csc);      var path = settings         .GetType()         .GetField("_compilerFullPath", BindingFlags.Instance | BindingFlags.NonPublic);      path.SetValue(settings, ((string)path.GetValue(settings)).Replace(@"bin\roslyn\", @"roslyn\"));      return csc; }); 

Answer 2

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();