Microsoft.CSharp.RuntimeBinder.Semantics.AggregateSymbol.IsPredefined C# (CSharp) Method

        public bool IsPredefined()
        {
            return _isPredefined;
        }

 public static string GetNiceName(AggregateSymbol type)
 {
     if (type.IsPredefined())
         return GetNiceName(type.GetPredefType());
     else
         return null;
 }