public static Type[] ToTypes(this string source, out IEnumerable<string> failures)
        {
            SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(source);
            string assemblyName = Path.GetRandomFileName();
            var assemblyPath = Path.GetDirectoryName(typeof(object).GetTypeInfo().Assembly.Location);
            List<MetadataReference> references = new List<MetadataReference>();
            var referencedAssemblies = Assembly.GetEntryAssembly().GetReferencedAssemblies();
            foreach (var referencedAssembly in referencedAssemblies)
            {
                var loadedAssembly = Assembly.Load(referencedAssembly);
                references.Add(MetadataReference.CreateFromFile(loadedAssembly.Location));
            }
                        references.Add(MetadataReference.CreateFromFile(typeof(HashSet<>).GetTypeInfo().Assembly.Location));
            references.Add(MetadataReference.CreateFromFile(typeof(object).GetTypeInfo().Assembly.Location));
            references.Add(MetadataReference.CreateFromFile(typeof(Enumerable).GetTypeInfo().Assembly.Location));
            references.Add(MetadataReference.CreateFromFile(typeof(DbContext).GetTypeInfo().Assembly.Location));

            /*
            references variable contains these MetadataReference =>

System.Runtime.dll
System.Runtime.InteropServices.dll
System.Reflection.dll
System.IO.dll
System.Text.RegularExpressions.dll
System.ComponentModel.Primitives.dll
DotLiquid.dll
System.Diagnostics.Debug.dll
System.Collections.dll
Microsoft.Extensions.Logging.Abstractions.dll
Microsoft.CodeAnalysis.dll
System.Threading.Tasks.dll
Microsoft.CodeAnalysis.CSharp.dll
Microsoft.CodeAnalysis.Scripting.dll
System.Collections.Immutable.dll
System.Linq.dll
System.Runtime.Extensions.dll
System.Threading.dll
System.Text.Encoding.dll
System.Reflection.Extensions.dll
Microsoft.CodeAnalysis.CSharp.Scripting.dll
System.Runtime.Loader.dll
Microsoft.EntityFrameworkCore.dll
System.Collections.dll
System.Private.CoreLib.ni.dll
System.Linq.dll
Microsoft.EntityFrameworkCore.dll
            */

            CSharpCompilation compilation = CSharpCompilation.Create(
                assemblyName,
                new[] { syntaxTree },
                references.ToArray(),
                new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
            using (var ms = new MemoryStream())
            {
                EmitResult result = compilation.Emit(ms);
                if (!result.Success)
                {
                    var errors = new List<string>();
                    var diagnostics = result.Diagnostics.Where(diagnostic =>
                        diagnostic.IsWarningAsError ||
                        diagnostic.Severity == DiagnosticSeverity.Error);
                    foreach (Diagnostic diagnostic in diagnostics)
                        errors.Add(string.Format("{0}: {1}", diagnostic.Id, diagnostic.GetMessage()));
                    failures = errors;
                }
                else
                {
                    failures = null;
                    ms.Seek(0, SeekOrigin.Begin);
                    Assembly assembly = AssemblyLoadContext.Default.LoadFromStream(new MemoryStream(ms.ToArray()));
                    Type[] types = assembly.GetTypes();
                    return types;
                }
            }
            return null;
        }

IEnumerable<string> failures;
var types = ef_source.ToTypes(out failures); // ef_source => attachment

CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'.