CODEWITHSUNDEEP
c#asp.net-corecode-generationroslyn
user3715648
user3715648

Reputation: 1588

Built up a class using Roslyn... now how do I actually compile it?

I'm trying to some old .net code to .net Core. I'm not too familiar with what i'm converting over, but it's some simple code gen using CodeDom. From what I can tell, this means I need to use Roslyn in .net Core.

This is what I had in the old code:

var thing = new CodeTypeDeclaration("test");
wrapper.IsClass = true;
wrapper.TypeAttributes = TypeAttributes.Public;

AddPropertyHelper(thing, typeof(string), "some_prop");
...
...
...
var compiler = CodeDomProvider.CreateProvider("CSharp");
var options = new CompilerParameters();
options.GenerateExecutable = false;
options.GenerateInMemory = true;
options.OutputAssembly = Path.GetTempFileName();
var results = provider.CompileAssemblyFromDom(options);
return results.CompiledAssembly.GetType(GeneratedNamespace + "." + "test");

and this is what I have so far in Roslyn:

var @namespace = SyntaxFactory.NamespaceDeclaration(SyntaxFactory.ParseName(GeneratedNamespace));
var classDeclaration = SyntaxFactory.ClassDeclaration("test");
classDeclaration.AddModifiers(SyntaxFactory.Token(SyntaxKind.PublicKeyword));
AddPropertyToWrapped(classDeclaration, typeof(string), "some_prop");

Edit: this is what i've added
---

var cu = SyntaxFactory.CompilationUnit();
cu.AddMembers(@namespace);
var compilation = CSharpCompilation.Create(
            "foo",
            syntaxTrees: new[] { cu.SyntaxTree },
            options: options,
            references: new[] {
                MetadataReference.CreateFromFile(typeof(object).GetTypeInfo().Assembly.Location),
                MetadataReference.CreateFromFile(typeof(Uri).GetTypeInfo().Assembly.Location),
                MetadataReference.CreateFromFile(coreDir.FullName + Path.DirectorySeparatorChar + "mscorlib.dll"),
                MetadataReference.CreateFromFile(coreDir.FullName + Path.DirectorySeparatorChar + "System.Runtime.dll")
            });
var ms = new MemoryStream();
var emitResult = compilation.Emit(ms);

---

I don't see anything about "compiling" it though. I haven't find any useful examples online or documentation that wasn't just overly complex. Is there something simple i'm missing?

Upvotes: 0

Views: 741

Answers (1)

SLaks
SLaks

Reputation: 888047

You're looking for the CSharpCompilation.Create() method, which takes SyntaxTrees and references.

You can then call its various Emit() methods to compile to a stream.

Upvotes: 1

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