Antlr.Runtime.MismatchedTokenException.ToString C# (CSharp) Method

        public override string ToString()
        {
            int unexpectedType = UnexpectedType;
            string unexpected = ( TokenNames != null && unexpectedType >= 0 && unexpectedType < TokenNames.Count ) ? TokenNames[unexpectedType] : unexpectedType.ToString();
            string expected = ( TokenNames != null && Expecting >= 0 && Expecting < TokenNames.Count ) ? TokenNames[Expecting] : Expecting.ToString();
            return "MismatchedTokenException(" + unexpected + "!=" + expected + ")";
        }