JEvaluator Jscript.net

using Microsoft.JScript;
using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace Soubisc.Infrastructure
{
    public static class JEvaluator
    {
        private const string JScriptSource =
@"
    class Evaluator
    {
        public function Eval(expression : String) : Object 
        {
            return eval(expression);
        }
    }
";
        private static object _evaluator;
        private static Type _evaluatorType;

        static JEvaluator()
        {
            //构造JScript的编译驱动代码
            CodeDomProvider provider = CodeDomProvider.CreateProvider("JScript");

            CompilerParameters parameters = new CompilerParameters();
            parameters.GenerateInMemory = true;

            CompilerResults results = provider.CompileAssemblyFromSource(parameters, JScriptSource);

            Assembly assembly = results.CompiledAssembly;
            _evaluatorType = assembly.GetType("Evaluator");

            _evaluator = Activator.CreateInstance(_evaluatorType);
        }

        public static object Eval(string statement)
        {
            return _evaluatorType.InvokeMember(
                "Eval",
                BindingFlags.InvokeMethod,
                null,
                _evaluator,
                new object[] { statement }
                );
        }
    }
}