Get type information for type declared in another assembly/project

Question

So as the title says I'm trying to get type information from types declared in another assembly using Roslyn. Initially I tried to do this by manually looking through referenced assemblies but realised I didn't have namespace information.

I was expecting the below to work:

  var workSpace = Roslyn.Services.Workspace.LoadSolution(solFilePath);

  IDocument file = null;
  IProject proje = null;

  Compilation compilation = Compilation.Create("Test");
  List<CommonSyntaxTree> trees = new List<CommonSyntaxTree>();

  foreach (var proj in workSpace.CurrentSolution.Projects)
  {
    foreach (var doc in proj.Documents)
    {
      if (doc.FilePath.ToLower() == filePath.ToLower())
      {
        file = doc;
        proje = proj;
      }
      else trees.Add(doc.GetSyntaxTree());
    }
  }

  var targetTree = file.GetSyntaxTree();

  trees.Add(targetTree);
  var compilation2 = (Compilation)compilation.AddSyntaxTrees(trees);

  var semanticModel = compilation2.GetSemanticModel(targetTree);

  var root = targetTree.GetRoot();

  var className = root.DescendantNodes().OfType<ClassDeclarationSyntax>().ToList().ElementAt(1);

  var properties = className.DescendantNodes().OfType<PropertyDeclarationSyntax>()
      .Where(p => p.Modifiers.Select(syn => syn.ToString().ToLower() == "public").Count() > 0).ToList();

  var typeInfo = semanticModel.GetTypeInfo(properties.First());

  var property = properties.First();

  var symbol = semanticModel.GetDeclaredSymbol(property);

  var symbol2 = semanticModel.GetSymbolInfo(property);

Neither typeInfo nor typeSyntax have the information that I need in them, what am I doing wrong here?

This is the class I'm parsing:

   class Foo
  {
    public Bar bar { get; set; }

    public Foo() { }

    public int GetInt(Bar bar, int ret = 5 ){
      return ret;
    }
  }

I'm trying to get Type information on the Bar class which is defined in another assembly.

Thanks for any help.

Answer 1

Don't call GetTypeInfo. Instead, once you have the PropertyDeclarationSyntax, call GetDeclaredSymbol with that declaration syntax, and you will get the IPropertySymbol for that property. From there, you can grab IPropertySymbol.Type, which is the type you're looking for.