public IEvaluator CreateEvaluator(Expression expression)
        {
            // 转换为后缀表达式集合
            List<ExpressionItem> postfixExpressions = PostfixTranslator.Translate(expression.Items);

            Evaluator eval = new Evaluator(postfixExpressions, this.Accuracy);

            return eval;
        }
Example #2
0
        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                ExpressionContext context = new ExpressionContext();
                var expression = new Expression(this.txtExpression.Text);
                IEvaluator eval = context.CreateEvaluator(expression);
                int count = Convert.ToInt32(this.textBox2.Text);
                double result = 0;
                for (int i = 0; i < count; i++)
                {
                    result = eval.Evaluate();
                }

                MessageBox.Show(result.ToString(CultureInfo.InvariantCulture));
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
 public double Evaluate(string expression, ExpressionParam[] parameters = null)
 {
     var exp = new Expression(expression);
     IEvaluator eval = CreateEvaluator(exp);
     return eval.Evaluate(parameters);
 }