AlgorithmEngine engine = new AlgorithmEngine();
    double a=0.0;
    if (engine.Parse("1+2")) {
        var o = engine.Evaluate();
        a=o.NumberValue;
    }
    var b = engine.TryEvaluate("1=1 && 1<2 and 7-8>1", 0);// Support(支持) && || and or 
    var c = engine.TryEvaluate("2+3", 0);
    var q = engine.TryEvaluate("-7 < -2 ?1 : 2", 0);
    var e = engine.TryEvaluate("count(array(1,2,3,4))", 0);//{} represents array, return: 4 {}代表数组,返回:4
    var s = engine.TryEvaluate("'aa'&'bb'", ""); //String connection, return: AABB 字符串连接,返回:aabb
    var r = engine.TryEvaluate("(1=1)*9+2", 0); //Return: 11 返回:11
    var d = engine.TryEvaluate("'2016-1-1'+1", DateTime.MinValue); //Return date: 2016-1-2 返回日期:2016-1-2
    var t = engine.TryEvaluate("'2016-1-1'+9*'1:0'", DateTime.MinValue);//Return datetime:2016-1-1 9:0  返回日期:2016-1-1 9:0
    var j = engine.TryEvaluate("json('{\"Name\":\"William Shakespeare\",\"Age\":51,\"Birthday\":\"04/26/1564 00:00:00\"}').Age", null);//Return 51 返回51
    var k = engine.TryEvaluate("json('{\"Name\":\"William Shakespeare   \",\"Age\":51,\"Birthday\":\"04/26/1564 00:00:00\"}')[Name].Trim()", null);//Return to "William Shakespeare"  返回"William Shakespeare" (不带空格)
    var l = engine.TryEvaluate("json('{\"Name1\":\"William Shakespeare \",\"Age\":51,\"Birthday\":\"04/26/1564 00:00:00\"}')['Name'& 1].Trim().substring(2,3)", null);//Return "ill"  返回"ill"

    //Define cylinder information  定义圆柱信息 
    public class Cylinder : AlgorithmEngine
    {
        private int _radius;
        private int _height;
        public Cylinder(int radius, int height)
        {
            _radius = radius;
            _height = height;
        }

        protected override Operand GetParameter(string parameter)
        {
            if (parameter == "半径")
            {
                return Operand.Create(_radius);
            }
            if (parameter == "直径")
            {
                return Operand.Create(_radius * 2);
            }
            if (parameter == "高")
            {
                return Operand.Create(_height);
            }
            return base.GetParameter(parameter);
        }
    }
    //Call method  调用方法
    Cylinder c = new Cylinder(3, 10);
    c.TryEvaluate("[半径]*[半径]*pi()", 0.0);      //Round bottom area  圆底面积
    c.TryEvaluate("[直径]*pi()", 0.0);            //The length of the circle  圆的长
    c.TryEvaluate("[半径]*[半径]*pi()*[高]", 0.0); //Volume of circle 圆的体积
    c.TryEvaluate("['半径']*[半径]*pi()*[高]", 0.0); //Volume of circle 圆的体积
    c.EvaluateFormula("'圆'-[半径]-高", '-'); // Return: 圆-3-10
    c.GetSimplifiedFormula("半径*if(半径>2,1+4,3)"); // Return: 3 * 5

    ConditionCache multiConditionCache = new ConditionCache();
    multiConditionCache.LazyLoad = true;
    multiConditionCache.AddFormula("桌面积", "[圆桌]", "[半径]*[半径]*pi()");
    multiConditionCache.AddFormula("桌面积", "[方桌]", "[长]*[宽]");
    multiConditionCache.AddFormula("价格", "[圆桌]&& [半径]<2.5", "[桌面积]*1.3");
    multiConditionCache.AddFormula("价格", "[圆桌]&& [半径]<5", "[桌面积]*1.5");
    multiConditionCache.AddFormula("价格", "[圆桌]&& [半径]<7", "[桌面积]*2");
    multiConditionCache.AddFormula("价格", "[圆桌]", "[桌面积]*2.5");
    multiConditionCache.AddFormula("价格", "[方桌]&& [长]<1.3", "[桌面积]*1.3+[高]*1.1");
    multiConditionCache.AddFormula("价格", "[方桌]&& [长]<2", "[桌面积]*1.5+[高]*1.1");
    multiConditionCache.AddFormula("价格", "[方桌]&& [长]<5", "[桌面积]*2+[高]*1.1");
    multiConditionCache.AddFormula("价格", "[方桌]&& [长]<7", "[桌面积]*2.5");

    var algoEngine = new ToolGood.Algorithm.AlgorithmEngineEx(multiConditionCache);
    algoEngine.JumpConditionError = true;
    algoEngine.AddParameter("方桌", true);
    algoEngine.AddParameter("长", 3);
    algoEngine.AddParameter("宽", 1.3);
    algoEngine.AddParameter("高", 1);

    var p2 = algoEngine.TryEvaluate("价格", 0.0);
    Assert.AreEqual(3 * 1.3 * 2 + 1 * 1.1, p2, 0.0001);

    var helper = new ToolGood.Algorithm.AlgorithmEngineHelper();
    helper.IsKeywords("false"); // return true
    helper.IsKeywords("true"); // return true
    helper.IsKeywords("mysql"); // return false

    DiyNameInfo p5 = helper.GetDiyNames("ddd(d1,22)");
    Assert.AreEqual("ddd", p5.Functions[0]);
    Assert.AreEqual("d1", p5.Parameters[0]);