Using C# 6 Features with Codedomprovider (Roslyn)

Using C# 6 features with CodeDomProvider (Roslyn)

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();

Using C# 6 features with CodeDomProvider (Roslyn)

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();

`Add-Type` C# 6+ features throwing errors

Powershell uses CodeDomProvider to compile their assemblies. The version provided with the framework just supports C# 5, so no new features are available by default.

However, if you provide another CodeDomProvider, you can compile any language, also C#6. There is a CodeDomProvider available for Roslyn (the new .NET compiler). You can download it from NuGet and include the assembly using Add-Type. Then create an instance of the compiler and pass that in the -CodeDomProvider attribute.

Roslyn - CodeDom: HowTo dynamically compile Code to Universal-Windows-Library

There's an option to reference the compiler and runtime version. The latest release of Roslyn have this new feature that you can specify which target framework you want to use and which version of compiler you want to use.

I was also looking around to explore latest Roslyn library to compile a CSharp6 version program to compile against 4.6 framework. Below is my working sample.

Note, runtimepath variable which is pointing to .Net framework libraries and CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.CSharp6) option in Parser.

 public class Program
    {
        private static readonly IEnumerable<string> DefaultNamespaces =
            new[]
            {
                "System", 
                "System.IO", 
                "System.Net", 
                "System.Linq", 
                "System.Text", 
                "System.Text.RegularExpressions", 
                "System.Collections.Generic"
            };

        private static string runtimePath = @"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.6\{0}.dll";

        private static readonly IEnumerable<MetadataReference> DefaultReferences =
            new[]
            {
                MetadataReference.CreateFromFile(string.Format(runtimePath, "mscorlib")),
                MetadataReference.CreateFromFile(string.Format(runtimePath, "System")),
                MetadataReference.CreateFromFile(string.Format(runtimePath, "System.Core"))
            };

        private static readonly CSharpCompilationOptions DefaultCompilationOptions =
            new CSharpCompilationOptions(OutputKind.WindowsRuntimeApplication)
                    .WithOverflowChecks(true)
                    .WithOptimizationLevel(OptimizationLevel.Release)
                    .WithUsings(DefaultNamespaces);

        public static SyntaxTree Parse(string text, string filename = "", CSharpParseOptions options = null)
        {
            var stringText = SourceText.From(text, Encoding.UTF8);
            return SyntaxFactory.ParseSyntaxTree(stringText, options, filename);
        }

        public static void Main(string[] args)
        {
            //ReferenceFinder finder = new ReferenceFinder();
            //finder.Find("Read");

            var fileToCompile = @"C:\Users\..\Documents\Visual Studio 2013\Projects\SignalR_Everything\Program.cs";
            var source = File.ReadAllText(fileToCompile);
            var parsedSyntaxTree = Parse(source, "", CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.CSharp6));

            var compilation
                = CSharpCompilation.Create("Test.dll", new SyntaxTree[] { parsedSyntaxTree }, DefaultReferences, DefaultCompilationOptions);
            try
            {
                var result = compilation.Emit(@"c:\temp\Test.dll");

                Console.WriteLine(result.Success ? "Sucess!!" : "Failed");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            Console.Read();
        }
    }

How to compile c#-6.0+ code at runtime?

The fix to that problem was to use Microsoft.CodeDom.Providers.DotNetCompilerPlatform. And also I had to change the using Microsoft.CSharp to Microsoft.CodeDom.Providers.DotNetCompilerPlatform

see https://stackoverflow.com/a/40311406/34092 for more info

Many thanks to @mjwillis who helped me reach this solution.

---

Related Topics