Exception executing JS code from C#: Function expected

Question

I have this javasccript expression code as a string in my C# code, I need to evaluate it (execute it) using Microsoft.JScript.Eval.JScriptEvaluate (c#) and get result back.

string code = @"var roles=[];
roles.push('LOC_IND');
roles.push('MANAGERL3');
var country='CANADA';
var age=80;
eval(""roles.indexOf('Administrator')>=0||roles.indexOf('LOC_IND')>=0&&country=='CANADA'"")";

// Calling JScript.Eval to execute that code
var engine = Microsoft.JScript.Vsa.VsaEngine.CreateEngine();
var result = Microsoft.JScript.Eval.JScriptEvaluate(code, engine);

The javascript code itself works fine, if you execute it in browser console, and returns "true", as expected:

var roles=[];
roles.push('LOC_IND');
roles.push('MANAGERL3');
var country='CANADA';
var age=80;
eval("roles.indexOf('Administrator')>=0||roles.indexOf('LOC_IND')>=0&&country=='CANADA'")

However, when I call it from C# Eval.JScriptEvaluate(code, engine); I get this exception:

Function expected.

I am not sure what function it expects and what do I have to do to fix that? At the end Eval.JScriptEvaluate(code, engine) must return true.

Answer 1

Thanks a lot doggy :)

I found an easier way, using another library - Jint.

This location is the right one: https://github.com/sebastienros/jint

string code = @"var roles=[];
roles.push('LOC_IND');
roles.push('MANAGERL3');
var country='CANADA';
var age=80;
function foo(){return roles.indexOf('Administrator')>=0||roles.indexOf('LOC_IND')>=0&&country=='CANADA';}";

// Using Jint - Javascript Interpreter for .NET

var result = new Jint.Engine().Execute(code).Invoke("foo");

P.S. Another option is to use self-invoking function, but it is more difficult to get to the return bool result:

string code = @"var roles=[];
roles.push('LOC_IND');
roles.push('MANAGERL3');
var country='CANADA';
var age=80;
(function(){return roles.indexOf('Administrator')>=0||roles.indexOf('LOC_IND')>=0&&country=='CANADA';})();";

var result = new Jint.Engine()
    .Execute(code)
    .Boolean
    .PrototypeObject
    .PrimitiveValue
    .AsBoolean();