test.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Recommendations;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var workspace = new CustomWorkspace();
            var proj = workspace.AddProject("Program", LanguageNames.CSharp);
            var documentText = @"
using System;
namespace Test{
class Program{
static void Main(string[] args)
{
var name = ""hwllo eorld"";

}
}
}
";
            var doc = workspace.AddDocument(proj, "Program.cs", documentText);


            SyntaxTree tree = CSharpSyntaxTree.ParseText(documentText);

            var root = (CompilationUnitSyntax)tree.GetRoot();

            var compilation = CSharpCompilation.Create("HelloWorld")
            .AddReferences(
            new MetadataFileReference(
            typeof(object).Assembly.Location))
            .AddSyntaxTrees(tree);

            var model = compilation.GetSemanticModel(tree);


            var rec =Recommender.GetRecommendedSymbolsAtPosition(model, documentText.IndexOf("eorld")+8, workspace);
            foreach (var symbol in rec)
            {
                var parts = symbol.ToMinimalDisplayParts(model, documentText.IndexOf("eorld") + 8);
                Console.WriteLine();
            }
            Console.ReadKey();
        }
    }
}