Question

I have a textbox where i want to read user-input mathematical functions( ex: Math.Sqrt(x) etc).

The code I’ve been using for console testing the function is

    static double f(double x)
    {
        double f;
        f = Math.Sqrt(x);
        return f;
    }

I’m not sure how to modify it: do I read the textbox contents in a string, and add that string as a second argument to the f function ( static double f(double x, string s)? what type of parsing should I apply to the string?

Answer 1

There are several formula parsers out there that you can use.

Basically you need someone/something that evaluates your formula.

I’m using this one successfully in my own projects. It allows for calling it like

var ev = 
    new Eval3.Evaluator(
        Eval3.eParserSyntax.c,/*caseSensitive*/ 
        false);

MessageBox.Show(ev.Parse("1+2+3").value.ToString());

What I would not recommend to use is the dynamic compilation of C# code since it adds each compiled code to your application domain (“app domain”) and there is no option to unload it again. (Correct me, if I’m wrong).