public void Test()
{
ExpressionLanguageEngine engine = ExpressionLanguageEngine.CreateEngine();
engine.Assign("m", 10);
engine.Assign("v", 5);
float E = engine.Eval <float>("m*v*v/2");
Assert.AreEqual(125, E);
}
protected override void DoCheck(IValidateResult result, object instance, object propertyValue)
{
//Extend:use cache to improve performance.
ExpressionLanguageEngineConfig cfg = new ExpressionLanguageEngineConfig(EvalExceptionHandlingPolicy.IgnorePolicy);
ExpressionLanguageEngine engine = ExpressionLanguageEngine.CreateEngine(cfg);
engine.Assign(INSTANCE, instance);
engine.Assign(VALUE, propertyValue);
object b = engine.Eval(_expr);
if (!engine.EvalToBool(b))
{
string msg = string.Format(MSG, _pInfo.Name, instance.GetType().Name, propertyValue, _expr);
this.LogValidateResult(result, msg);
}
}
public void Test1()
{
string expr = "(a>b)?a:b";
object res = engine.Eval(expr);
Assert.AreEqual(10, res);
}
public override int Visit(LetNode obj)
{
_ctx.Assign(obj.VarName, _engine.Eval(obj.Expression));
return(0);
}