问V8Engine.Execute返回“未定义”，而Microsoft.JScript的eval返回一个值

EN

const t_sch_ohd = 0.1;
const t_fn = 8.302;
const t_byte = 0.04307;

var n_byte = Lookup.IndexedMsgSize (1);

var t_total = t_fn + (n_byte * t_byte) + t_sch_ohd;

public uint IndexedMsgSize(uint mIndex)
{
    // only intended for MsgProcess_Fn
    if (m_message == null)
    {
        if (m_function == null)
        {
            throw new RaceException("Function reference not specified for Lookup.IndexedMsgSize");
        }
        uint count = (uint)m_function.RelatedMessagesByUDC[((int)mIndex) - 1].MessageLength;
        return count;
    }
    else
    {
        throw new RaceException("message reference not allowed for Lookup.IndexedMsgSize");
    }
}

public string Execute(string script)
{
    string result = "";

    try
    {
        //  EVALUATE THE SCRIPT                                 
        result = Evaluator.Eval(script);
        //using (var engine = new ScriptEngine("jscript"))
        //{
        //    ParsedScript parsed =
        //        engine.Parse("function MyFunc(x){return eval(x,'unsafe')}");
        //    engine.SetNamedItem("Lookup", m_lookup);
        //    result = parsed.CallMethod("MyFunc", script).ToString();
        //}
    }
    catch (Exception ex)
    {
        // JScript error?
        if (ex.Source.CompareTo("Microsoft.JScript") == 0)
        {
            // Yes, turn it into a Race JScript Exception to avoid a stack trace dump.
            throw new RaceScriptException(ex as JScriptException);
        }
        // Not a JScript error, so just re-throw exception.
        throw ex;
    }

    return result;
}

static function Eval(expression : String) : String {
        return eval(expression,'unsafe');
}

public string Execute(string script)
{
    string result = "";

    try
    {
        //  EVALUATE THE SCRIPT

        //Create the V8.Net Engine                  
        V8Engine e = new V8Engine();
        //Set the Lookup instance as a global object so that the JS code in the V8.Net wrapper can access it
        e.GlobalObject.SetProperty("Lookup", m_lookup, null, true, ScriptMemberSecurity.Permanent);
        //Execute the script
        result = e.Execute(script);

        //Deprecated code:
        //result = Evaluator.Eval(script);
        //using (var engine = new ScriptEngine("jscript"))
        //{
        //    ParsedScript parsed =
        //        engine.Parse("function MyFunc(x){return eval(x,'unsafe')}");
        //    engine.SetNamedItem("Lookup", m_lookup);
        //    result = parsed.CallMethod("MyFunc", script).ToString();
        //}
    }
    catch (Exception ex)
    {
        // V8.NET error?
        if (ex.Source.CompareTo("V8.Net") == 0)
        {
            // Yes, turn it into a Race V8 Exception to avoid a stack trace dump.
            throw (V8Exception)ex;
        }
        // Not a V8 error, so just re-throw exception.
        throw ex;
    }

    return result;
}