using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;
using System.Linq;
using System;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class Program
    {
        class Structure { }
        static async Task Main(string[] args)
        {
            //Nuget: Microsoft.CodeAnalysis
            var workspace = new AdhocWorkspace();
            var newProjectId = workspace.AddProject("NewProject", LanguageNames.CSharp).Id;
            var sourceText = SourceText.From("" +
                @"
class Program
{
    class Structure { }
    static void Main(string[] args)
    {

        var structure = new Structure();
        structure
        structure.A = 0;
    }
}
                ");
            var newDocument = workspace.AddDocument(newProjectId, "NewFile.cs", sourceText);
            var syntaxRoot = await newDocument.GetSyntaxRootAsync();
            var syntaxTree = syntaxRoot.SyntaxTree;
            var compilation = await newDocument.Project.GetCompilationAsync();
            var semanticModel = compilation.GetSemanticModel(syntaxTree);
            var varDecl = syntaxRoot.DescendantNodes().OfType<VariableDeclarationSyntax>().Skip(1).First();
            var id = varDecl.DescendantNodes().OfType<IdentifierNameSyntax>().First();
            var ti = semanticModel.GetSymbolInfo(id);
        }
    }
}