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;
}
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);
}
